Re: [PATCH] mm: kill kmemcheck again

From: Levin, Alexander (Sasha Levin)
Date: Wed Sep 27 2017 - 07:33:34 EST

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I stupidly forgot to Cc Pekka and Vegard, now Cc'ed.

On Wed, Sep 27, 2017 at 11:27:40AM +0000, Levin, Alexander (Sasha Levin) wrote:
>2 Years ago I proposed to kill kmemcheck:
>
>> As discussed on LSF/MM, kill kmemcheck.
>>
>> KASan is a replacement that is able to work without the limitation of
>> kmemcheck (single CPU, slow). KASan is already upstream.
>>
>> We are also not aware of any users of kmemcheck (or users who don't consider
>> KASan as a suitable replacement).
>
>The only objection was that since KASAN wasn't supported by all GCC
>versions provided by distros at that time we should hold off for 2
>years, and try again.
>
>Now that 2 years have passed, and all distros provide gcc that supports
>KASAN, kill kmemcheck again for the very same reasons.
>
>Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
>Cc: David S. Miller <davem@xxxxxxxxxxxxx>
>Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
>---
> Documentation/admin-guide/kernel-parameters.txt | 7 -
> Documentation/dev-tools/index.rst | 1 -
> Documentation/dev-tools/kmemcheck.rst | 733 ------------------------
> MAINTAINERS | 10 -
> arch/arm/include/asm/dma-iommu.h | 1 -
> arch/arm/include/asm/pgalloc.h | 2 +-
> arch/arm64/include/asm/pgalloc.h | 2 +-
> arch/openrisc/include/asm/dma-mapping.h | 1 -
> arch/powerpc/include/asm/pgalloc.h | 2 +-
> arch/sh/kernel/dwarf.c | 4 +-
> arch/sh/kernel/process.c | 2 +-
> arch/sparc/mm/init_64.c | 4 +-
> arch/unicore32/include/asm/pgalloc.h | 2 +-
> arch/x86/Kconfig | 3 +-
> arch/x86/Makefile | 5 -
> arch/x86/include/asm/dma-mapping.h | 1 -
> arch/x86/include/asm/kmemcheck.h | 42 --
> arch/x86/include/asm/pgtable.h | 5 -
> arch/x86/include/asm/pgtable_types.h | 13 -
> arch/x86/include/asm/string_32.h | 9 -
> arch/x86/include/asm/string_64.h | 8 -
> arch/x86/include/asm/xor.h | 4 +-
> arch/x86/kernel/cpu/intel.c | 15 -
> arch/x86/kernel/espfix_64.c | 2 +-
> arch/x86/kernel/traps.c | 5 -
> arch/x86/mm/Makefile | 2 -
> arch/x86/mm/fault.c | 6 -
> arch/x86/mm/init.c | 8 +-
> arch/x86/mm/init_64.c | 2 +-
> arch/x86/mm/kmemcheck/Makefile | 1 -
> arch/x86/mm/kmemcheck/error.c | 227 --------
> arch/x86/mm/kmemcheck/error.h | 15 -
> arch/x86/mm/kmemcheck/kmemcheck.c | 658 ---------------------
> arch/x86/mm/kmemcheck/opcode.c | 106 ----
> arch/x86/mm/kmemcheck/opcode.h | 9 -
> arch/x86/mm/kmemcheck/pte.c | 22 -
> arch/x86/mm/kmemcheck/pte.h | 10 -
> arch/x86/mm/kmemcheck/selftest.c | 70 ---
> arch/x86/mm/kmemcheck/selftest.h | 6 -
> arch/x86/mm/kmemcheck/shadow.c | 173 ------
> arch/x86/mm/kmemcheck/shadow.h | 18 -
> arch/x86/mm/pageattr.c | 10 +-
> arch/x86/mm/pgtable.c | 2 +-
> arch/x86/platform/efi/efi_64.c | 2 +-
> crypto/xor.c | 7 +-
> drivers/char/random.c | 1 -
> drivers/misc/c2port/core.c | 2 -
> fs/dcache.c | 2 -
> include/linux/c2port.h | 4 -
> include/linux/dma-mapping.h | 8 +-
> include/linux/filter.h | 2 -
> include/linux/gfp.h | 9 -
> include/linux/interrupt.h | 15 -
> include/linux/kmemcheck.h | 171 ------
> include/linux/mm_types.h | 8 -
> include/linux/net.h | 3 -
> include/linux/ring_buffer.h | 3 -
> include/linux/skbuff.h | 3 -
> include/linux/slab.h | 6 -
> include/linux/thread_info.h | 5 +-
> include/net/inet_sock.h | 3 -
> include/net/inet_timewait_sock.h | 3 -
> include/net/sock.h | 2 -
> include/trace/events/mmflags.h | 1 -
> init/do_mounts.c | 3 +-
> init/main.c | 1 -
> kernel/bpf/core.c | 6 -
> kernel/fork.c | 12 +-
> kernel/locking/lockdep.c | 3 -
> kernel/signal.c | 3 +-
> kernel/softirq.c | 10 -
> kernel/sysctl.c | 10 -
> kernel/trace/ring_buffer.c | 3 -
> lib/Kconfig.debug | 6 +-
> lib/Kconfig.kmemcheck | 94 ---
> mm/Kconfig.debug | 1 -
> mm/Makefile | 2 -
> mm/kmemcheck.c | 125 ----
> mm/kmemleak.c | 9 -
> mm/page_alloc.c | 14 -
> mm/slab.c | 16 +-
> mm/slab.h | 7 +-
> mm/slab_common.c | 2 +-
> mm/slub.c | 31 +-
> net/core/skbuff.c | 5 -
> net/core/sock.c | 2 -
> net/ipv4/inet_timewait_sock.c | 3 -
> net/ipv4/tcp_input.c | 1 -
> net/socket.c | 1 -
> scripts/kernel-doc | 2 -
> tools/include/linux/kmemcheck.h | 8 -
> tools/perf/builtin-kmem.c | 1 -
> 92 files changed, 44 insertions(+), 2825 deletions(-)
> delete mode 100644 Documentation/dev-tools/kmemcheck.rst
> delete mode 100644 arch/x86/include/asm/kmemcheck.h
> delete mode 100644 arch/x86/mm/kmemcheck/Makefile
> delete mode 100644 arch/x86/mm/kmemcheck/error.c
> delete mode 100644 arch/x86/mm/kmemcheck/error.h
> delete mode 100644 arch/x86/mm/kmemcheck/kmemcheck.c
> delete mode 100644 arch/x86/mm/kmemcheck/opcode.c
> delete mode 100644 arch/x86/mm/kmemcheck/opcode.h
> delete mode 100644 arch/x86/mm/kmemcheck/pte.c
> delete mode 100644 arch/x86/mm/kmemcheck/pte.h
> delete mode 100644 arch/x86/mm/kmemcheck/selftest.c
> delete mode 100644 arch/x86/mm/kmemcheck/selftest.h
> delete mode 100644 arch/x86/mm/kmemcheck/shadow.c
> delete mode 100644 arch/x86/mm/kmemcheck/shadow.h
> delete mode 100644 include/linux/kmemcheck.h
> delete mode 100644 lib/Kconfig.kmemcheck
> delete mode 100644 mm/kmemcheck.c
> delete mode 100644 tools/include/linux/kmemcheck.h
>
>diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
>index 05496622b4ef..5e1e0e7ebee3 100644
>--- a/Documentation/admin-guide/kernel-parameters.txt
>+++ b/Documentation/admin-guide/kernel-parameters.txt
>@@ -1841,13 +1841,6 @@
> Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y,
> the default is off.
>
>- kmemcheck= [X86] Boot-time kmemcheck enable/disable/one-shot mode
>- Valid arguments: 0, 1, 2
>- kmemcheck=0 (disabled)
>- kmemcheck=1 (enabled)
>- kmemcheck=2 (one-shot mode)
>- Default: 2 (one-shot mode)
>-
> kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
> Default is 0 (don't ignore, but inject #GP)
>
>diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst
>index a81787cd47d7..e313925fb0fa 100644
>--- a/Documentation/dev-tools/index.rst
>+++ b/Documentation/dev-tools/index.rst
>@@ -21,7 +21,6 @@ whole; patches welcome!
> kasan
> ubsan
> kmemleak
>- kmemcheck
> gdb-kernel-debugging
> kgdb
> kselftest
>diff --git a/Documentation/dev-tools/kmemcheck.rst b/Documentation/dev-tools/kmemcheck.rst
>deleted file mode 100644
>index 7f3d1985de74..000000000000
>--- a/Documentation/dev-tools/kmemcheck.rst
>+++ /dev/null
>@@ -1,733 +0,0 @@
>-Getting started with kmemcheck
>-==============================
>-
>-Vegard Nossum <vegardno@xxxxxxxxxx>
>-
>-
>-Introduction
>-------------
>-
>-kmemcheck is a debugging feature for the Linux Kernel. More specifically, it
>-is a dynamic checker that detects and warns about some uses of uninitialized
>-memory.
>-
>-Userspace programmers might be familiar with Valgrind's memcheck. The main
>-difference between memcheck and kmemcheck is that memcheck works for userspace
>-programs only, and kmemcheck works for the kernel only. The implementations
>-are of course vastly different. Because of this, kmemcheck is not as accurate
>-as memcheck, but it turns out to be good enough in practice to discover real
>-programmer errors that the compiler is not able to find through static
>-analysis.
>-
>-Enabling kmemcheck on a kernel will probably slow it down to the extent that
>-the machine will not be usable for normal workloads such as e.g. an
>-interactive desktop. kmemcheck will also cause the kernel to use about twice
>-as much memory as normal. For this reason, kmemcheck is strictly a debugging
>-feature.
>-
>-
>-Downloading
>------------
>-
>-As of version 2.6.31-rc1, kmemcheck is included in the mainline kernel.
>-
>-
>-Configuring and compiling
>--------------------------
>-
>-kmemcheck only works for the x86 (both 32- and 64-bit) platform. A number of
>-configuration variables must have specific settings in order for the kmemcheck
>-menu to even appear in "menuconfig". These are:
>-
>-- ``CONFIG_CC_OPTIMIZE_FOR_SIZE=n``
>- This option is located under "General setup" / "Optimize for size".
>-
>- Without this, gcc will use certain optimizations that usually lead to
>- false positive warnings from kmemcheck. An example of this is a 16-bit
>- field in a struct, where gcc may load 32 bits, then discard the upper
>- 16 bits. kmemcheck sees only the 32-bit load, and may trigger a
>- warning for the upper 16 bits (if they're uninitialized).
>-
>-- ``CONFIG_SLAB=y`` or ``CONFIG_SLUB=y``
>- This option is located under "General setup" / "Choose SLAB
>- allocator".
>-
>-- ``CONFIG_FUNCTION_TRACER=n``
>- This option is located under "Kernel hacking" / "Tracers" / "Kernel
>- Function Tracer"
>-
>- When function tracing is compiled in, gcc emits a call to another
>- function at the beginning of every function. This means that when the
>- page fault handler is called, the ftrace framework will be called
>- before kmemcheck has had a chance to handle the fault. If ftrace then
>- modifies memory that was tracked by kmemcheck, the result is an
>- endless recursive page fault.
>-
>-- ``CONFIG_DEBUG_PAGEALLOC=n``
>- This option is located under "Kernel hacking" / "Memory Debugging"
>- / "Debug page memory allocations".
>-
>-In addition, I highly recommend turning on ``CONFIG_DEBUG_INFO=y``. This is also
>-located under "Kernel hacking". With this, you will be able to get line number
>-information from the kmemcheck warnings, which is extremely valuable in
>-debugging a problem. This option is not mandatory, however, because it slows
>-down the compilation process and produces a much bigger kernel image.
>-
>-Now the kmemcheck menu should be visible (under "Kernel hacking" / "Memory
>-Debugging" / "kmemcheck: trap use of uninitialized memory"). Here follows
>-a description of the kmemcheck configuration variables:
>-
>-- ``CONFIG_KMEMCHECK``
>- This must be enabled in order to use kmemcheck at all...
>-
>-- ``CONFIG_KMEMCHECK_``[``DISABLED`` | ``ENABLED`` | ``ONESHOT``]``_BY_DEFAULT``
>- This option controls the status of kmemcheck at boot-time. "Enabled"
>- will enable kmemcheck right from the start, "disabled" will boot the
>- kernel as normal (but with the kmemcheck code compiled in, so it can
>- be enabled at run-time after the kernel has booted), and "one-shot" is
>- a special mode which will turn kmemcheck off automatically after
>- detecting the first use of uninitialized memory.
>-
>- If you are using kmemcheck to actively debug a problem, then you
>- probably want to choose "enabled" here.
>-
>- The one-shot mode is mostly useful in automated test setups because it
>- can prevent floods of warnings and increase the chances of the machine
>- surviving in case something is really wrong. In other cases, the one-
>- shot mode could actually be counter-productive because it would turn
>- itself off at the very first error -- in the case of a false positive
>- too -- and this would come in the way of debugging the specific
>- problem you were interested in.
>-
>- If you would like to use your kernel as normal, but with a chance to
>- enable kmemcheck in case of some problem, it might be a good idea to
>- choose "disabled" here. When kmemcheck is disabled, most of the run-
>- time overhead is not incurred, and the kernel will be almost as fast
>- as normal.
>-
>-- ``CONFIG_KMEMCHECK_QUEUE_SIZE``
>- Select the maximum number of error reports to store in an internal
>- (fixed-size) buffer. Since errors can occur virtually anywhere and in
>- any context, we need a temporary storage area which is guaranteed not
>- to generate any other page faults when accessed. The queue will be
>- emptied as soon as a tasklet may be scheduled. If the queue is full,
>- new error reports will be lost.
>-
>- The default value of 64 is probably fine. If some code produces more
>- than 64 errors within an irqs-off section, then the code is likely to
>- produce many, many more, too, and these additional reports seldom give
>- any more information (the first report is usually the most valuable
>- anyway).
>-
>- This number might have to be adjusted if you are not using serial
>- console or similar to capture the kernel log. If you are using the
>- "dmesg" command to save the log, then getting a lot of kmemcheck
>- warnings might overflow the kernel log itself, and the earlier reports
>- will get lost in that way instead. Try setting this to 10 or so on
>- such a setup.
>-
>-- ``CONFIG_KMEMCHECK_SHADOW_COPY_SHIFT``
>- Select the number of shadow bytes to save along with each entry of the
>- error-report queue. These bytes indicate what parts of an allocation
>- are initialized, uninitialized, etc. and will be displayed when an
>- error is detected to help the debugging of a particular problem.
>-
>- The number entered here is actually the logarithm of the number of
>- bytes that will be saved. So if you pick for example 5 here, kmemcheck
>- will save 2^5 = 32 bytes.
>-
>- The default value should be fine for debugging most problems. It also
>- fits nicely within 80 columns.
>-
>-- ``CONFIG_KMEMCHECK_PARTIAL_OK``
>- This option (when enabled) works around certain GCC optimizations that
>- produce 32-bit reads from 16-bit variables where the upper 16 bits are
>- thrown away afterwards.
>-
>- The default value (enabled) is recommended. This may of course hide
>- some real errors, but disabling it would probably produce a lot of
>- false positives.
>-
>-- ``CONFIG_KMEMCHECK_BITOPS_OK``
>- This option silences warnings that would be generated for bit-field
>- accesses where not all the bits are initialized at the same time. This
>- may also hide some real bugs.
>-
>- This option is probably obsolete, or it should be replaced with
>- the kmemcheck-/bitfield-annotations for the code in question. The
>- default value is therefore fine.
>-
>-Now compile the kernel as usual.
>-
>-
>-How to use
>-----------
>-
>-Booting
>-~~~~~~~
>-
>-First some information about the command-line options. There is only one
>-option specific to kmemcheck, and this is called "kmemcheck". It can be used
>-to override the default mode as chosen by the ``CONFIG_KMEMCHECK_*_BY_DEFAULT``
>-option. Its possible settings are:
>-
>-- ``kmemcheck=0`` (disabled)
>-- ``kmemcheck=1`` (enabled)
>-- ``kmemcheck=2`` (one-shot mode)
>-
>-If SLUB debugging has been enabled in the kernel, it may take precedence over
>-kmemcheck in such a way that the slab caches which are under SLUB debugging
>-will not be tracked by kmemcheck. In order to ensure that this doesn't happen
>-(even though it shouldn't by default), use SLUB's boot option ``slub_debug``,
>-like this: ``slub_debug=-``
>-
>-In fact, this option may also be used for fine-grained control over SLUB vs.
>-kmemcheck. For example, if the command line includes
>-``kmemcheck=1 slub_debug=,dentry``, then SLUB debugging will be used only
>-for the "dentry" slab cache, and with kmemcheck tracking all the other
>-caches. This is advanced usage, however, and is not generally recommended.
>-
>-
>-Run-time enable/disable
>-~~~~~~~~~~~~~~~~~~~~~~~
>-
>-When the kernel has booted, it is possible to enable or disable kmemcheck at
>-run-time. WARNING: This feature is still experimental and may cause false
>-positive warnings to appear. Therefore, try not to use this. If you find that
>-it doesn't work properly (e.g. you see an unreasonable amount of warnings), I
>-will be happy to take bug reports.
>-
>-Use the file ``/proc/sys/kernel/kmemcheck`` for this purpose, e.g.::
>-
>- $ echo 0 > /proc/sys/kernel/kmemcheck # disables kmemcheck
>-
>-The numbers are the same as for the ``kmemcheck=`` command-line option.
>-
>-
>-Debugging
>-~~~~~~~~~
>-
>-A typical report will look something like this::
>-
>- WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffff88003e4a2024)
>- 80000000000000000000000000000000000000000088ffff0000000000000000
>- i i i i u u u u i i i i i i i i u u u u u u u u u u u u u u u u
>- ^
>-
>- Pid: 1856, comm: ntpdate Not tainted 2.6.29-rc5 #264 945P-A
>- RIP: 0010:[<ffffffff8104ede8>] [<ffffffff8104ede8>] __dequeue_signal+0xc8/0x190
>- RSP: 0018:ffff88003cdf7d98 EFLAGS: 00210002
>- RAX: 0000000000000030 RBX: ffff88003d4ea968 RCX: 0000000000000009
>- RDX: ffff88003e5d6018 RSI: ffff88003e5d6024 RDI: ffff88003cdf7e84
>- RBP: ffff88003cdf7db8 R08: ffff88003e5d6000 R09: 0000000000000000
>- R10: 0000000000000080 R11: 0000000000000000 R12: 000000000000000e
>- R13: ffff88003cdf7e78 R14: ffff88003d530710 R15: ffff88003d5a98c8
>- FS: 0000000000000000(0000) GS:ffff880001982000(0063) knlGS:00000
>- CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>- CR2: ffff88003f806ea0 CR3: 000000003c036000 CR4: 00000000000006a0
>- DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>- DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
>- [<ffffffff8104f04e>] dequeue_signal+0x8e/0x170
>- [<ffffffff81050bd8>] get_signal_to_deliver+0x98/0x390
>- [<ffffffff8100b87d>] do_notify_resume+0xad/0x7d0
>- [<ffffffff8100c7b5>] int_signal+0x12/0x17
>- [<ffffffffffffffff>] 0xffffffffffffffff
>-
>-The single most valuable information in this report is the RIP (or EIP on 32-
>-bit) value. This will help us pinpoint exactly which instruction that caused
>-the warning.
>-
>-If your kernel was compiled with ``CONFIG_DEBUG_INFO=y``, then all we have to do
>-is give this address to the addr2line program, like this::
>-
>- $ addr2line -e vmlinux -i ffffffff8104ede8
>- arch/x86/include/asm/string_64.h:12
>- include/asm-generic/siginfo.h:287
>- kernel/signal.c:380
>- kernel/signal.c:410
>-
>-The "``-e vmlinux``" tells addr2line which file to look in. **IMPORTANT:**
>-This must be the vmlinux of the kernel that produced the warning in the
>-first place! If not, the line number information will almost certainly be
>-wrong.
>-
>-The "``-i``" tells addr2line to also print the line numbers of inlined
>-functions. In this case, the flag was very important, because otherwise,
>-it would only have printed the first line, which is just a call to
>-``memcpy()``, which could be called from a thousand places in the kernel, and
>-is therefore not very useful. These inlined functions would not show up in
>-the stack trace above, simply because the kernel doesn't load the extra
>-debugging information. This technique can of course be used with ordinary
>-kernel oopses as well.
>-
>-In this case, it's the caller of ``memcpy()`` that is interesting, and it can be
>-found in ``include/asm-generic/siginfo.h``, line 287::
>-
>- 281 static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
>- 282 {
>- 283 if (from->si_code < 0)
>- 284 memcpy(to, from, sizeof(*to));
>- 285 else
>- 286 /* _sigchld is currently the largest know union member */
>- 287 memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
>- 288 }
>-
>-Since this was a read (kmemcheck usually warns about reads only, though it can
>-warn about writes to unallocated or freed memory as well), it was probably the
>-"from" argument which contained some uninitialized bytes. Following the chain
>-of calls, we move upwards to see where "from" was allocated or initialized,
>-``kernel/signal.c``, line 380::
>-
>- 359 static void collect_signal(int sig, struct sigpending *list, siginfo_t *info)
>- 360 {
>- ...
>- 367 list_for_each_entry(q, &list->list, list) {
>- 368 if (q->info.si_signo == sig) {
>- 369 if (first)
>- 370 goto still_pending;
>- 371 first = q;
>- ...
>- 377 if (first) {
>- 378 still_pending:
>- 379 list_del_init(&first->list);
>- 380 copy_siginfo(info, &first->info);
>- 381 __sigqueue_free(first);
>- ...
>- 392 }
>- 393 }
>-
>-Here, it is ``&first->info`` that is being passed on to ``copy_siginfo()``. The
>-variable ``first`` was found on a list -- passed in as the second argument to
>-``collect_signal()``. We continue our journey through the stack, to figure out
>-where the item on "list" was allocated or initialized. We move to line 410::
>-
>- 395 static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
>- 396 siginfo_t *info)
>- 397 {
>- ...
>- 410 collect_signal(sig, pending, info);
>- ...
>- 414 }
>-
>-Now we need to follow the ``pending`` pointer, since that is being passed on to
>-``collect_signal()`` as ``list``. At this point, we've run out of lines from the
>-"addr2line" output. Not to worry, we just paste the next addresses from the
>-kmemcheck stack dump, i.e.::
>-
>- [<ffffffff8104f04e>] dequeue_signal+0x8e/0x170
>- [<ffffffff81050bd8>] get_signal_to_deliver+0x98/0x390
>- [<ffffffff8100b87d>] do_notify_resume+0xad/0x7d0
>- [<ffffffff8100c7b5>] int_signal+0x12/0x17
>-
>- $ addr2line -e vmlinux -i ffffffff8104f04e ffffffff81050bd8 \
>- ffffffff8100b87d ffffffff8100c7b5
>- kernel/signal.c:446
>- kernel/signal.c:1806
>- arch/x86/kernel/signal.c:805
>- arch/x86/kernel/signal.c:871
>- arch/x86/kernel/entry_64.S:694
>-
>-Remember that since these addresses were found on the stack and not as the
>-RIP value, they actually point to the _next_ instruction (they are return
>-addresses). This becomes obvious when we look at the code for line 446::
>-
>- 422 int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
>- 423 {
>- ...
>- 431 signr = __dequeue_signal(&tsk->signal->shared_pending,
>- 432 mask, info);
>- 433 /*
>- 434 * itimer signal ?
>- 435 *
>- 436 * itimers are process shared and we restart periodic
>- 437 * itimers in the signal delivery path to prevent DoS
>- 438 * attacks in the high resolution timer case. This is
>- 439 * compliant with the old way of self restarting
>- 440 * itimers, as the SIGALRM is a legacy signal and only
>- 441 * queued once. Changing the restart behaviour to
>- 442 * restart the timer in the signal dequeue path is
>- 443 * reducing the timer noise on heavy loaded !highres
>- 444 * systems too.
>- 445 */
>- 446 if (unlikely(signr == SIGALRM)) {
>- ...
>- 489 }
>-
>-So instead of looking at 446, we should be looking at 431, which is the line
>-that executes just before 446. Here we see that what we are looking for is
>-``&tsk->signal->shared_pending``.
>-
>-Our next task is now to figure out which function that puts items on this
>-``shared_pending`` list. A crude, but efficient tool, is ``git grep``::
>-
>- $ git grep -n 'shared_pending' kernel/
>- ...
>- kernel/signal.c:828: pending = group ? &t->signal->shared_pending : &t->pending;
>- kernel/signal.c:1339: pending = group ? &t->signal->shared_pending : &t->pending;
>- ...
>-
>-There were more results, but none of them were related to list operations,
>-and these were the only assignments. We inspect the line numbers more closely
>-and find that this is indeed where items are being added to the list::
>-
>- 816 static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
>- 817 int group)
>- 818 {
>- ...
>- 828 pending = group ? &t->signal->shared_pending : &t->pending;
>- ...
>- 851 q = __sigqueue_alloc(t, GFP_ATOMIC, (sig < SIGRTMIN &&
>- 852 (is_si_special(info) ||
>- 853 info->si_code >= 0)));
>- 854 if (q) {
>- 855 list_add_tail(&q->list, &pending->list);
>- ...
>- 890 }
>-
>-and::
>-
>- 1309 int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
>- 1310 {
>- ....
>- 1339 pending = group ? &t->signal->shared_pending : &t->pending;
>- 1340 list_add_tail(&q->list, &pending->list);
>- ....
>- 1347 }
>-
>-In the first case, the list element we are looking for, ``q``, is being
>-returned from the function ``__sigqueue_alloc()``, which looks like an
>-allocation function. Let's take a look at it::
>-
>- 187 static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
>- 188 int override_rlimit)
>- 189 {
>- 190 struct sigqueue *q = NULL;
>- 191 struct user_struct *user;
>- 192
>- 193 /*
>- 194 * We won't get problems with the target's UID changing under us
>- 195 * because changing it requires RCU be used, and if t != current, the
>- 196 * caller must be holding the RCU readlock (by way of a spinlock) and
>- 197 * we use RCU protection here
>- 198 */
>- 199 user = get_uid(__task_cred(t)->user);
>- 200 atomic_inc(&user->sigpending);
>- 201 if (override_rlimit ||
>- 202 atomic_read(&user->sigpending) <=
>- 203 t->signal->rlim[RLIMIT_SIGPENDING].rlim_cur)
>- 204 q = kmem_cache_alloc(sigqueue_cachep, flags);
>- 205 if (unlikely(q == NULL)) {
>- 206 atomic_dec(&user->sigpending);
>- 207 free_uid(user);
>- 208 } else {
>- 209 INIT_LIST_HEAD(&q->list);
>- 210 q->flags = 0;
>- 211 q->user = user;
>- 212 }
>- 213
>- 214 return q;
>- 215 }
>-
>-We see that this function initializes ``q->list``, ``q->flags``, and
>-``q->user``. It seems that now is the time to look at the definition of
>-``struct sigqueue``, e.g.::
>-
>- 14 struct sigqueue {
>- 15 struct list_head list;
>- 16 int flags;
>- 17 siginfo_t info;
>- 18 struct user_struct *user;
>- 19 };
>-
>-And, you might remember, it was a ``memcpy()`` on ``&first->info`` that
>-caused the warning, so this makes perfect sense. It also seems reasonable
>-to assume that it is the caller of ``__sigqueue_alloc()`` that has the
>-responsibility of filling out (initializing) this member.
>-
>-But just which fields of the struct were uninitialized? Let's look at
>-kmemcheck's report again::
>-
>- WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffff88003e4a2024)
>- 80000000000000000000000000000000000000000088ffff0000000000000000
>- i i i i u u u u i i i i i i i i u u u u u u u u u u u u u u u u
>- ^
>-
>-These first two lines are the memory dump of the memory object itself, and
>-the shadow bytemap, respectively. The memory object itself is in this case
>-``&first->info``. Just beware that the start of this dump is NOT the start
>-of the object itself! The position of the caret (^) corresponds with the
>-address of the read (ffff88003e4a2024).
>-
>-The shadow bytemap dump legend is as follows:
>-
>-- i: initialized
>-- u: uninitialized
>-- a: unallocated (memory has been allocated by the slab layer, but has not
>- yet been handed off to anybody)
>-- f: freed (memory has been allocated by the slab layer, but has been freed
>- by the previous owner)
>-
>-In order to figure out where (relative to the start of the object) the
>-uninitialized memory was located, we have to look at the disassembly. For
>-that, we'll need the RIP address again::
>-
>- RIP: 0010:[<ffffffff8104ede8>] [<ffffffff8104ede8>] __dequeue_signal+0xc8/0x190
>-
>- $ objdump -d --no-show-raw-insn vmlinux | grep -C 8 ffffffff8104ede8:
>- ffffffff8104edc8: mov %r8,0x8(%r8)
>- ffffffff8104edcc: test %r10d,%r10d
>- ffffffff8104edcf: js ffffffff8104ee88 <__dequeue_signal+0x168>
>- ffffffff8104edd5: mov %rax,%rdx
>- ffffffff8104edd8: mov $0xc,%ecx
>- ffffffff8104eddd: mov %r13,%rdi
>- ffffffff8104ede0: mov $0x30,%eax
>- ffffffff8104ede5: mov %rdx,%rsi
>- ffffffff8104ede8: rep movsl %ds:(%rsi),%es:(%rdi)
>- ffffffff8104edea: test $0x2,%al
>- ffffffff8104edec: je ffffffff8104edf0 <__dequeue_signal+0xd0>
>- ffffffff8104edee: movsw %ds:(%rsi),%es:(%rdi)
>- ffffffff8104edf0: test $0x1,%al
>- ffffffff8104edf2: je ffffffff8104edf5 <__dequeue_signal+0xd5>
>- ffffffff8104edf4: movsb %ds:(%rsi),%es:(%rdi)
>- ffffffff8104edf5: mov %r8,%rdi
>- ffffffff8104edf8: callq ffffffff8104de60 <__sigqueue_free>
>-
>-As expected, it's the "``rep movsl``" instruction from the ``memcpy()``
>-that causes the warning. We know about ``REP MOVSL`` that it uses the register
>-``RCX`` to count the number of remaining iterations. By taking a look at the
>-register dump again (from the kmemcheck report), we can figure out how many
>-bytes were left to copy::
>-
>- RAX: 0000000000000030 RBX: ffff88003d4ea968 RCX: 0000000000000009
>-
>-By looking at the disassembly, we also see that ``%ecx`` is being loaded
>-with the value ``$0xc`` just before (ffffffff8104edd8), so we are very
>-lucky. Keep in mind that this is the number of iterations, not bytes. And
>-since this is a "long" operation, we need to multiply by 4 to get the
>-number of bytes. So this means that the uninitialized value was encountered
>-at 4 * (0xc - 0x9) = 12 bytes from the start of the object.
>-
>-We can now try to figure out which field of the "``struct siginfo``" that
>-was not initialized. This is the beginning of the struct::
>-
>- 40 typedef struct siginfo {
>- 41 int si_signo;
>- 42 int si_errno;
>- 43 int si_code;
>- 44
>- 45 union {
>- ..
>- 92 } _sifields;
>- 93 } siginfo_t;
>-
>-On 64-bit, the int is 4 bytes long, so it must the union member that has
>-not been initialized. We can verify this using gdb::
>-
>- $ gdb vmlinux
>- ...
>- (gdb) p &((struct siginfo *) 0)->_sifields
>- $1 = (union {...} *) 0x10
>-
>-Actually, it seems that the union member is located at offset 0x10 -- which
>-means that gcc has inserted 4 bytes of padding between the members ``si_code``
>-and ``_sifields``. We can now get a fuller picture of the memory dump::
>-
>- _----------------------------=> si_code
>- / _--------------------=> (padding)
>- | / _------------=> _sifields(._kill._pid)
>- | | / _----=> _sifields(._kill._uid)
>- | | | /
>- -------|-------|-------|-------|
>- 80000000000000000000000000000000000000000088ffff0000000000000000
>- i i i i u u u u i i i i i i i i u u u u u u u u u u u u u u u u
>-
>-This allows us to realize another important fact: ``si_code`` contains the
>-value 0x80. Remember that x86 is little endian, so the first 4 bytes
>-"80000000" are really the number 0x00000080. With a bit of research, we
>-find that this is actually the constant ``SI_KERNEL`` defined in
>-``include/asm-generic/siginfo.h``::
>-
>- 144 #define SI_KERNEL 0x80 /* sent by the kernel from somewhere */
>-
>-This macro is used in exactly one place in the x86 kernel: In ``send_signal()``
>-in ``kernel/signal.c``::
>-
>- 816 static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
>- 817 int group)
>- 818 {
>- ...
>- 828 pending = group ? &t->signal->shared_pending : &t->pending;
>- ...
>- 851 q = __sigqueue_alloc(t, GFP_ATOMIC, (sig < SIGRTMIN &&
>- 852 (is_si_special(info) ||
>- 853 info->si_code >= 0)));
>- 854 if (q) {
>- 855 list_add_tail(&q->list, &pending->list);
>- 856 switch ((unsigned long) info) {
>- ...
>- 865 case (unsigned long) SEND_SIG_PRIV:
>- 866 q->info.si_signo = sig;
>- 867 q->info.si_errno = 0;
>- 868 q->info.si_code = SI_KERNEL;
>- 869 q->info.si_pid = 0;
>- 870 q->info.si_uid = 0;
>- 871 break;
>- ...
>- 890 }
>-
>-Not only does this match with the ``.si_code`` member, it also matches the place
>-we found earlier when looking for where siginfo_t objects are enqueued on the
>-``shared_pending`` list.
>-
>-So to sum up: It seems that it is the padding introduced by the compiler
>-between two struct fields that is uninitialized, and this gets reported when
>-we do a ``memcpy()`` on the struct. This means that we have identified a false
>-positive warning.
>-
>-Normally, kmemcheck will not report uninitialized accesses in ``memcpy()`` calls
>-when both the source and destination addresses are tracked. (Instead, we copy
>-the shadow bytemap as well). In this case, the destination address clearly
>-was not tracked. We can dig a little deeper into the stack trace from above::
>-
>- arch/x86/kernel/signal.c:805
>- arch/x86/kernel/signal.c:871
>- arch/x86/kernel/entry_64.S:694
>-
>-And we clearly see that the destination siginfo object is located on the
>-stack::
>-
>- 782 static void do_signal(struct pt_regs *regs)
>- 783 {
>- 784 struct k_sigaction ka;
>- 785 siginfo_t info;
>- ...
>- 804 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
>- ...
>- 854 }
>-
>-And this ``&info`` is what eventually gets passed to ``copy_siginfo()`` as the
>-destination argument.
>-
>-Now, even though we didn't find an actual error here, the example is still a
>-good one, because it shows how one would go about to find out what the report
>-was all about.
>-
>-
>-Annotating false positives
>-~~~~~~~~~~~~~~~~~~~~~~~~~~
>-
>-There are a few different ways to make annotations in the source code that
>-will keep kmemcheck from checking and reporting certain allocations. Here
>-they are:
>-
>-- ``__GFP_NOTRACK_FALSE_POSITIVE``
>- This flag can be passed to ``kmalloc()`` or ``kmem_cache_alloc()``
>- (therefore also to other functions that end up calling one of
>- these) to indicate that the allocation should not be tracked
>- because it would lead to a false positive report. This is a "big
>- hammer" way of silencing kmemcheck; after all, even if the false
>- positive pertains to particular field in a struct, for example, we
>- will now lose the ability to find (real) errors in other parts of
>- the same struct.
>-
>- Example::
>-
>- /* No warnings will ever trigger on accessing any part of x */
>- x = kmalloc(sizeof *x, GFP_KERNEL | __GFP_NOTRACK_FALSE_POSITIVE);
>-
>-- ``kmemcheck_bitfield_begin(name)``/``kmemcheck_bitfield_end(name)`` and
>- ``kmemcheck_annotate_bitfield(ptr, name)``
>- The first two of these three macros can be used inside struct
>- definitions to signal, respectively, the beginning and end of a
>- bitfield. Additionally, this will assign the bitfield a name, which
>- is given as an argument to the macros.
>-
>- Having used these markers, one can later use
>- kmemcheck_annotate_bitfield() at the point of allocation, to indicate
>- which parts of the allocation is part of a bitfield.
>-
>- Example::
>-
>- struct foo {
>- int x;
>-
>- kmemcheck_bitfield_begin(flags);
>- int flag_a:1;
>- int flag_b:1;
>- kmemcheck_bitfield_end(flags);
>-
>- int y;
>- };
>-
>- struct foo *x = kmalloc(sizeof *x);
>-
>- /* No warnings will trigger on accessing the bitfield of x */
>- kmemcheck_annotate_bitfield(x, flags);
>-
>- Note that ``kmemcheck_annotate_bitfield()`` can be used even before the
>- return value of ``kmalloc()`` is checked -- in other words, passing NULL
>- as the first argument is legal (and will do nothing).
>-
>-
>-Reporting errors
>-----------------
>-
>-As we have seen, kmemcheck will produce false positive reports. Therefore, it
>-is not very wise to blindly post kmemcheck warnings to mailing lists and
>-maintainers. Instead, I encourage maintainers and developers to find errors
>-in their own code. If you get a warning, you can try to work around it, try
>-to figure out if it's a real error or not, or simply ignore it. Most
>-developers know their own code and will quickly and efficiently determine the
>-root cause of a kmemcheck report. This is therefore also the most efficient
>-way to work with kmemcheck.
>-
>-That said, we (the kmemcheck maintainers) will always be on the lookout for
>-false positives that we can annotate and silence. So whatever you find,
>-please drop us a note privately! Kernel configs and steps to reproduce (if
>-available) are of course a great help too.
>-
>-Happy hacking!
>-
>-
>-Technical description
>----------------------
>-
>-kmemcheck works by marking memory pages non-present. This means that whenever
>-somebody attempts to access the page, a page fault is generated. The page
>-fault handler notices that the page was in fact only hidden, and so it calls
>-on the kmemcheck code to make further investigations.
>-
>-When the investigations are completed, kmemcheck "shows" the page by marking
>-it present (as it would be under normal circumstances). This way, the
>-interrupted code can continue as usual.
>-
>-But after the instruction has been executed, we should hide the page again, so
>-that we can catch the next access too! Now kmemcheck makes use of a debugging
>-feature of the processor, namely single-stepping. When the processor has
>-finished the one instruction that generated the memory access, a debug
>-exception is raised. From here, we simply hide the page again and continue
>-execution, this time with the single-stepping feature turned off.
>-
>-kmemcheck requires some assistance from the memory allocator in order to work.
>-The memory allocator needs to
>-
>- 1. Tell kmemcheck about newly allocated pages and pages that are about to
>- be freed. This allows kmemcheck to set up and tear down the shadow memory
>- for the pages in question. The shadow memory stores the status of each
>- byte in the allocation proper, e.g. whether it is initialized or
>- uninitialized.
>-
>- 2. Tell kmemcheck which parts of memory should be marked uninitialized.
>- There are actually a few more states, such as "not yet allocated" and
>- "recently freed".
>-
>-If a slab cache is set up using the SLAB_NOTRACK flag, it will never return
>-memory that can take page faults because of kmemcheck.
>-
>-If a slab cache is NOT set up using the SLAB_NOTRACK flag, callers can still
>-request memory with the __GFP_NOTRACK or __GFP_NOTRACK_FALSE_POSITIVE flags.
>-This does not prevent the page faults from occurring, however, but marks the
>-object in question as being initialized so that no warnings will ever be
>-produced for this object.
>-
>-Currently, the SLAB and SLUB allocators are supported by kmemcheck.
>diff --git a/MAINTAINERS b/MAINTAINERS
>index 6671f375f7fc..74eee2abeeb5 100644
>--- a/MAINTAINERS
>+++ b/MAINTAINERS
>@@ -7669,16 +7669,6 @@ F: include/linux/kdb.h
> F: include/linux/kgdb.h
> F: kernel/debug/
>
>-KMEMCHECK
>-M: Vegard Nossum <vegardno@xxxxxxxxxx>
>-M: Pekka Enberg <penberg@xxxxxxxxxx>
>-S: Maintained
>-F: Documentation/dev-tools/kmemcheck.rst
>-F: arch/x86/include/asm/kmemcheck.h
>-F: arch/x86/mm/kmemcheck/
>-F: include/linux/kmemcheck.h
>-F: mm/kmemcheck.c
>-
> KMEMLEAK
> M: Catalin Marinas <catalin.marinas@xxxxxxx>
> S: Maintained
>diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
>index c090ec675eac..5ad676f2de22 100644
>--- a/arch/arm/include/asm/dma-iommu.h
>+++ b/arch/arm/include/asm/dma-iommu.h
>@@ -6,7 +6,6 @@
> #include <linux/mm_types.h>
> #include <linux/scatterlist.h>
> #include <linux/dma-debug.h>
>-#include <linux/kmemcheck.h>
> #include <linux/kref.h>
>
> #define ARM_MAPPING_ERROR (~(dma_addr_t)0x0)
>diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
>index b2902a5cd780..2d7344f0e208 100644
>--- a/arch/arm/include/asm/pgalloc.h
>+++ b/arch/arm/include/asm/pgalloc.h
>@@ -57,7 +57,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
> extern pgd_t *pgd_alloc(struct mm_struct *mm);
> extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
>
>-#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
>
> static inline void clean_pte_table(pte_t *pte)
> {
>diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h
>index d25f4f137c2a..5ca6a573a701 100644
>--- a/arch/arm64/include/asm/pgalloc.h
>+++ b/arch/arm64/include/asm/pgalloc.h
>@@ -26,7 +26,7 @@
>
> #define check_pgt_cache() do { } while (0)
>
>-#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
> #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
>
> #if CONFIG_PGTABLE_LEVELS > 2
>diff --git a/arch/openrisc/include/asm/dma-mapping.h b/arch/openrisc/include/asm/dma-mapping.h
>index f41bd3cb76d9..e212a1f0b6d2 100644
>--- a/arch/openrisc/include/asm/dma-mapping.h
>+++ b/arch/openrisc/include/asm/dma-mapping.h
>@@ -23,7 +23,6 @@
> */
>
> #include <linux/dma-debug.h>
>-#include <linux/kmemcheck.h>
> #include <linux/dma-mapping.h>
>
> extern const struct dma_map_ops or1k_dma_map_ops;
>diff --git a/arch/powerpc/include/asm/pgalloc.h b/arch/powerpc/include/asm/pgalloc.h
>index 45ae1212ab8a..bb01297b617a 100644
>--- a/arch/powerpc/include/asm/pgalloc.h
>+++ b/arch/powerpc/include/asm/pgalloc.h
>@@ -17,7 +17,7 @@ static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
> }
> #endif /* MODULE */
>
>-#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
>
> #ifdef CONFIG_PPC_BOOK3S
> #include <asm/book3s/pgalloc.h>
>diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
>index e1d751ae2498..1a2526676a87 100644
>--- a/arch/sh/kernel/dwarf.c
>+++ b/arch/sh/kernel/dwarf.c
>@@ -1172,11 +1172,11 @@ static int __init dwarf_unwinder_init(void)
>
> dwarf_frame_cachep = kmem_cache_create("dwarf_frames",
> sizeof(struct dwarf_frame), 0,
>- SLAB_PANIC | SLAB_HWCACHE_ALIGN | SLAB_NOTRACK, NULL);
>+ SLAB_PANIC | SLAB_HWCACHE_ALIGN, NULL);
>
> dwarf_reg_cachep = kmem_cache_create("dwarf_regs",
> sizeof(struct dwarf_reg), 0,
>- SLAB_PANIC | SLAB_HWCACHE_ALIGN | SLAB_NOTRACK, NULL);
>+ SLAB_PANIC | SLAB_HWCACHE_ALIGN, NULL);
>
> dwarf_frame_pool = mempool_create_slab_pool(DWARF_FRAME_MIN_REQ,
> dwarf_frame_cachep);
>diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
>index f8a695a223dd..ded55e7461f8 100644
>--- a/arch/sh/kernel/process.c
>+++ b/arch/sh/kernel/process.c
>@@ -58,7 +58,7 @@ void arch_task_cache_init(void)
>
> task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
> __alignof__(union thread_xstate),
>- SLAB_PANIC | SLAB_NOTRACK, NULL);
>+ SLAB_PANIC, NULL);
> }
>
> #ifdef CONFIG_SH_FPU_EMU
>diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
>index b2ba410b26f4..78f79004be2c 100644
>--- a/arch/sparc/mm/init_64.c
>+++ b/arch/sparc/mm/init_64.c
>@@ -2926,7 +2926,7 @@ void __flush_tlb_all(void)
> pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
> unsigned long address)
> {
>- struct page *page = alloc_page(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
>+ struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
> pte_t *pte = NULL;
>
> if (page)
>@@ -2938,7 +2938,7 @@ pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
> pgtable_t pte_alloc_one(struct mm_struct *mm,
> unsigned long address)
> {
>- struct page *page = alloc_page(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
>+ struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
> if (!page)
> return NULL;
> if (!pgtable_page_ctor(page)) {
>diff --git a/arch/unicore32/include/asm/pgalloc.h b/arch/unicore32/include/asm/pgalloc.h
>index 26775793c204..f0fdb268f8f2 100644
>--- a/arch/unicore32/include/asm/pgalloc.h
>+++ b/arch/unicore32/include/asm/pgalloc.h
>@@ -28,7 +28,7 @@ extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
> #define pgd_alloc(mm) get_pgd_slow(mm)
> #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
>
>-#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
>
> /*
> * Allocate one PTE table.
>diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>index 971feac13506..f2b6484a0b36 100644
>--- a/arch/x86/Kconfig
>+++ b/arch/x86/Kconfig
>@@ -109,7 +109,6 @@ config X86
> select HAVE_ARCH_JUMP_LABEL
> select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
> select HAVE_ARCH_KGDB
>- select HAVE_ARCH_KMEMCHECK
> select HAVE_ARCH_MMAP_RND_BITS if MMU
> select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
> select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT
>@@ -1428,7 +1427,7 @@ config ARCH_DMA_ADDR_T_64BIT
>
> config X86_DIRECT_GBPAGES
> def_bool y
>- depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
>+ depends on X86_64 && !DEBUG_PAGEALLOC
> ---help---
> Certain kernel features effectively disable kernel
> linear 1 GB mappings (even if the CPU otherwise
>diff --git a/arch/x86/Makefile b/arch/x86/Makefile
>index 6276572259c8..559eb0a282fd 100644
>--- a/arch/x86/Makefile
>+++ b/arch/x86/Makefile
>@@ -157,11 +157,6 @@ ifdef CONFIG_X86_X32
> endif
> export CONFIG_X86_X32_ABI
>
>-# Don't unroll struct assignments with kmemcheck enabled
>-ifeq ($(CONFIG_KMEMCHECK),y)
>- KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
>-endif
>-
> #
> # If the function graph tracer is used with mcount instead of fentry,
> # '-maccumulate-outgoing-args' is needed to prevent a GCC bug
>diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
>index 1387dafdba2d..bd974c04c9aa 100644
>--- a/arch/x86/include/asm/dma-mapping.h
>+++ b/arch/x86/include/asm/dma-mapping.h
>@@ -6,7 +6,6 @@
> * Documentation/DMA-API.txt for documentation.
> */
>
>-#include <linux/kmemcheck.h>
> #include <linux/scatterlist.h>
> #include <linux/dma-debug.h>
> #include <asm/io.h>
>diff --git a/arch/x86/include/asm/kmemcheck.h b/arch/x86/include/asm/kmemcheck.h
>deleted file mode 100644
>index ed01518f297e..000000000000
>--- a/arch/x86/include/asm/kmemcheck.h
>+++ /dev/null
>@@ -1,42 +0,0 @@
>-#ifndef ASM_X86_KMEMCHECK_H
>-#define ASM_X86_KMEMCHECK_H
>-
>-#include <linux/types.h>
>-#include <asm/ptrace.h>
>-
>-#ifdef CONFIG_KMEMCHECK
>-bool kmemcheck_active(struct pt_regs *regs);
>-
>-void kmemcheck_show(struct pt_regs *regs);
>-void kmemcheck_hide(struct pt_regs *regs);
>-
>-bool kmemcheck_fault(struct pt_regs *regs,
>- unsigned long address, unsigned long error_code);
>-bool kmemcheck_trap(struct pt_regs *regs);
>-#else
>-static inline bool kmemcheck_active(struct pt_regs *regs)
>-{
>- return false;
>-}
>-
>-static inline void kmemcheck_show(struct pt_regs *regs)
>-{
>-}
>-
>-static inline void kmemcheck_hide(struct pt_regs *regs)
>-{
>-}
>-
>-static inline bool kmemcheck_fault(struct pt_regs *regs,
>- unsigned long address, unsigned long error_code)
>-{
>- return false;
>-}
>-
>-static inline bool kmemcheck_trap(struct pt_regs *regs)
>-{
>- return false;
>-}
>-#endif /* CONFIG_KMEMCHECK */
>-
>-#endif
>diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
>index b714934512b3..d110e38893d1 100644
>--- a/arch/x86/include/asm/pgtable.h
>+++ b/arch/x86/include/asm/pgtable.h
>@@ -666,11 +666,6 @@ static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
> return false;
> }
>
>-static inline int pte_hidden(pte_t pte)
>-{
>- return pte_flags(pte) & _PAGE_HIDDEN;
>-}
>-
> static inline int pmd_present(pmd_t pmd)
> {
> /*
>diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
>index f1492473f10e..27e230dec7a4 100644
>--- a/arch/x86/include/asm/pgtable_types.h
>+++ b/arch/x86/include/asm/pgtable_types.h
>@@ -31,7 +31,6 @@
>
> #define _PAGE_BIT_SPECIAL _PAGE_BIT_SOFTW1
> #define _PAGE_BIT_CPA_TEST _PAGE_BIT_SOFTW1
>-#define _PAGE_BIT_HIDDEN _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
> #define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
> #define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4
>
>@@ -78,18 +77,6 @@
> #define _PAGE_KNL_ERRATUM_MASK 0
> #endif
>
>-#ifdef CONFIG_KMEMCHECK
>-#define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
>-#else
>-#define _PAGE_HIDDEN (_AT(pteval_t, 0))
>-#endif
>-
>-/*
>- * The same hidden bit is used by kmemcheck, but since kmemcheck
>- * works on kernel pages while soft-dirty engine on user space,
>- * they do not conflict with each other.
>- */
>-
> #ifdef CONFIG_MEM_SOFT_DIRTY
> #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
> #else
>diff --git a/arch/x86/include/asm/string_32.h b/arch/x86/include/asm/string_32.h
>index e371e7229042..00a4429ac12c 100644
>--- a/arch/x86/include/asm/string_32.h
>+++ b/arch/x86/include/asm/string_32.h
>@@ -178,8 +178,6 @@ static inline void *__memcpy3d(void *to, const void *from, size_t len)
> * No 3D Now!
> */
>
>-#ifndef CONFIG_KMEMCHECK
>-
> #if (__GNUC__ >= 4)
> #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
> #else
>@@ -188,13 +186,6 @@ static inline void *__memcpy3d(void *to, const void *from, size_t len)
> ? __constant_memcpy((t), (f), (n)) \
> : __memcpy((t), (f), (n)))
> #endif
>-#else
>-/*
>- * kmemcheck becomes very happy if we use the REP instructions unconditionally,
>- * because it means that we know both memory operands in advance.
>- */
>-#define memcpy(t, f, n) __memcpy((t), (f), (n))
>-#endif
>
> #endif
> #endif /* !CONFIG_FORTIFY_SOURCE */
>diff --git a/arch/x86/include/asm/string_64.h b/arch/x86/include/asm/string_64.h
>index f372a70a523f..08071875881d 100644
>--- a/arch/x86/include/asm/string_64.h
>+++ b/arch/x86/include/asm/string_64.h
>@@ -32,7 +32,6 @@ extern void *memcpy(void *to, const void *from, size_t len);
> extern void *__memcpy(void *to, const void *from, size_t len);
>
> #ifndef CONFIG_FORTIFY_SOURCE
>-#ifndef CONFIG_KMEMCHECK
> #if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4
> #define memcpy(dst, src, len) \
> ({ \
>@@ -45,13 +44,6 @@ extern void *__memcpy(void *to, const void *from, size_t len);
> __ret; \
> })
> #endif
>-#else
>-/*
>- * kmemcheck becomes very happy if we use the REP instructions unconditionally,
>- * because it means that we know both memory operands in advance.
>- */
>-#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
>-#endif
> #endif /* !CONFIG_FORTIFY_SOURCE */
>
> #define __HAVE_ARCH_MEMSET
>diff --git a/arch/x86/include/asm/xor.h b/arch/x86/include/asm/xor.h
>index 1f5c5161ead6..3d58e95fe74c 100644
>--- a/arch/x86/include/asm/xor.h
>+++ b/arch/x86/include/asm/xor.h
>@@ -1,7 +1,5 @@
>-#ifdef CONFIG_KMEMCHECK
>-/* kmemcheck doesn't handle MMX/SSE/SSE2 instructions */
> # include <asm-generic/xor.h>
>-#elif !defined(_ASM_X86_XOR_H)
>+#if !defined(_ASM_X86_XOR_H)
> #define _ASM_X86_XOR_H
>
> /*
>diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
>index dfa90a3a5145..873ca226d0ce 100644
>--- a/arch/x86/kernel/cpu/intel.c
>+++ b/arch/x86/kernel/cpu/intel.c
>@@ -186,21 +186,6 @@ static void early_init_intel(struct cpuinfo_x86 *c)
> if (c->x86 == 6 && c->x86_model < 15)
> clear_cpu_cap(c, X86_FEATURE_PAT);
>
>-#ifdef CONFIG_KMEMCHECK
>- /*
>- * P4s have a "fast strings" feature which causes single-
>- * stepping REP instructions to only generate a #DB on
>- * cache-line boundaries.
>- *
>- * Ingo Molnar reported a Pentium D (model 6) and a Xeon
>- * (model 2) with the same problem.
>- */
>- if (c->x86 == 15)
>- if (msr_clear_bit(MSR_IA32_MISC_ENABLE,
>- MSR_IA32_MISC_ENABLE_FAST_STRING_BIT) > 0)
>- pr_info("kmemcheck: Disabling fast string operations\n");
>-#endif
>-
> /*
> * If fast string is not enabled in IA32_MISC_ENABLE for any reason,
> * clear the fast string and enhanced fast string CPU capabilities.
>diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c
>index 9c4e7ba6870c..cbded50ee601 100644
>--- a/arch/x86/kernel/espfix_64.c
>+++ b/arch/x86/kernel/espfix_64.c
>@@ -57,7 +57,7 @@
> # error "Need more virtual address space for the ESPFIX hack"
> #endif
>
>-#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
>
> /* This contains the *bottom* address of the espfix stack */
> DEFINE_PER_CPU_READ_MOSTLY(unsigned long, espfix_stack);
>diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
>index 34ea3651362e..869e6e0612f5 100644
>--- a/arch/x86/kernel/traps.c
>+++ b/arch/x86/kernel/traps.c
>@@ -42,7 +42,6 @@
> #include <linux/edac.h>
> #endif
>
>-#include <asm/kmemcheck.h>
> #include <asm/stacktrace.h>
> #include <asm/processor.h>
> #include <asm/debugreg.h>
>@@ -740,10 +739,6 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
> if (!dr6 && user_mode(regs))
> user_icebp = 1;
>
>- /* Catch kmemcheck conditions! */
>- if ((dr6 & DR_STEP) && kmemcheck_trap(regs))
>- goto exit;
>-
> /* Store the virtualized DR6 value */
> tsk->thread.debugreg6 = dr6;
>
>diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
>index 72bf8c01c6e3..08042cf4a1db 100644
>--- a/arch/x86/mm/Makefile
>+++ b/arch/x86/mm/Makefile
>@@ -21,8 +21,6 @@ obj-$(CONFIG_X86_PTDUMP) += debug_pagetables.o
>
> obj-$(CONFIG_HIGHMEM) += highmem_32.o
>
>-obj-$(CONFIG_KMEMCHECK) += kmemcheck/
>-
> KASAN_SANITIZE_kasan_init_$(BITS).o := n
> obj-$(CONFIG_KASAN) += kasan_init_$(BITS).o
>
>diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
>index 39567b5c33da..5452f2a55586 100644
>--- a/arch/x86/mm/fault.c
>+++ b/arch/x86/mm/fault.c
>@@ -19,7 +19,6 @@
> #include <asm/cpufeature.h> /* boot_cpu_has, ... */
> #include <asm/traps.h> /* dotraplinkage, ... */
> #include <asm/pgalloc.h> /* pgd_*(), ... */
>-#include <asm/kmemcheck.h> /* kmemcheck_*(), ... */
> #include <asm/fixmap.h> /* VSYSCALL_ADDR */
> #include <asm/vsyscall.h> /* emulate_vsyscall */
> #include <asm/vm86.h> /* struct vm86 */
>@@ -1275,8 +1274,6 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
> * Detect and handle instructions that would cause a page fault for
> * both a tracked kernel page and a userspace page.
> */
>- if (kmemcheck_active(regs))
>- kmemcheck_hide(regs);
> prefetchw(&mm->mmap_sem);
>
> if (unlikely(kmmio_fault(regs, address)))
>@@ -1299,9 +1296,6 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
> if (!(error_code & (PF_RSVD | PF_USER | PF_PROT))) {
> if (vmalloc_fault(address) >= 0)
> return;
>-
>- if (kmemcheck_fault(regs, address, error_code))
>- return;
> }
>
> /* Can handle a stale RO->RW TLB: */
>diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
>index af5c1ed21d43..8b3fd7e8eb50 100644
>--- a/arch/x86/mm/init.c
>+++ b/arch/x86/mm/init.c
>@@ -92,8 +92,7 @@ __ref void *alloc_low_pages(unsigned int num)
> unsigned int order;
>
> order = get_order((unsigned long)num << PAGE_SHIFT);
>- return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK |
>- __GFP_ZERO, order);
>+ return (void *)__get_free_pages(GFP_ATOMIC | __GFP_ZERO, order);
> }
>
> if ((pgt_buf_end + num) > pgt_buf_top || !can_use_brk_pgt) {
>@@ -164,12 +163,11 @@ static int page_size_mask;
> static void __init probe_page_size_mask(void)
> {
> /*
>- * For CONFIG_KMEMCHECK or pagealloc debugging, identity mapping will
>- * use small pages.
>+ * For pagealloc debugging, identity mapping will use small pages.
> * This will simplify cpa(), which otherwise needs to support splitting
> * large pages into small in interrupt context, etc.
> */
>- if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled() && !IS_ENABLED(CONFIG_KMEMCHECK))
>+ if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled())
> page_size_mask |= 1 << PG_LEVEL_2M;
> else
> direct_gbpages = 0;
>diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
>index 048fbe8fc274..3f7ca42d1e22 100644
>--- a/arch/x86/mm/init_64.c
>+++ b/arch/x86/mm/init_64.c
>@@ -184,7 +184,7 @@ static __ref void *spp_getpage(void)
> void *ptr;
>
> if (after_bootmem)
>- ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
>+ ptr = (void *) get_zeroed_page(GFP_ATOMIC);
> else
> ptr = alloc_bootmem_pages(PAGE_SIZE);
>
>diff --git a/arch/x86/mm/kmemcheck/Makefile b/arch/x86/mm/kmemcheck/Makefile
>deleted file mode 100644
>index 520b3bce4095..000000000000
>--- a/arch/x86/mm/kmemcheck/Makefile
>+++ /dev/null
>@@ -1 +0,0 @@
>-obj-y := error.o kmemcheck.o opcode.o pte.o selftest.o shadow.o
>diff --git a/arch/x86/mm/kmemcheck/error.c b/arch/x86/mm/kmemcheck/error.c
>deleted file mode 100644
>index dab41876cdd5..000000000000
>--- a/arch/x86/mm/kmemcheck/error.c
>+++ /dev/null
>@@ -1,227 +0,0 @@
>-#include <linux/interrupt.h>
>-#include <linux/kdebug.h>
>-#include <linux/kmemcheck.h>
>-#include <linux/kernel.h>
>-#include <linux/types.h>
>-#include <linux/ptrace.h>
>-#include <linux/stacktrace.h>
>-#include <linux/string.h>
>-
>-#include "error.h"
>-#include "shadow.h"
>-
>-enum kmemcheck_error_type {
>- KMEMCHECK_ERROR_INVALID_ACCESS,
>- KMEMCHECK_ERROR_BUG,
>-};
>-
>-#define SHADOW_COPY_SIZE (1 << CONFIG_KMEMCHECK_SHADOW_COPY_SHIFT)
>-
>-struct kmemcheck_error {
>- enum kmemcheck_error_type type;
>-
>- union {
>- /* KMEMCHECK_ERROR_INVALID_ACCESS */
>- struct {
>- /* Kind of access that caused the error */
>- enum kmemcheck_shadow state;
>- /* Address and size of the erroneous read */
>- unsigned long address;
>- unsigned int size;
>- };
>- };
>-
>- struct pt_regs regs;
>- struct stack_trace trace;
>- unsigned long trace_entries[32];
>-
>- /* We compress it to a char. */
>- unsigned char shadow_copy[SHADOW_COPY_SIZE];
>- unsigned char memory_copy[SHADOW_COPY_SIZE];
>-};
>-
>-/*
>- * Create a ring queue of errors to output. We can't call printk() directly
>- * from the kmemcheck traps, since this may call the console drivers and
>- * result in a recursive fault.
>- */
>-static struct kmemcheck_error error_fifo[CONFIG_KMEMCHECK_QUEUE_SIZE];
>-static unsigned int error_count;
>-static unsigned int error_rd;
>-static unsigned int error_wr;
>-static unsigned int error_missed_count;
>-
>-static struct kmemcheck_error *error_next_wr(void)
>-{
>- struct kmemcheck_error *e;
>-
>- if (error_count == ARRAY_SIZE(error_fifo)) {
>- ++error_missed_count;
>- return NULL;
>- }
>-
>- e = &error_fifo[error_wr];
>- if (++error_wr == ARRAY_SIZE(error_fifo))
>- error_wr = 0;
>- ++error_count;
>- return e;
>-}
>-
>-static struct kmemcheck_error *error_next_rd(void)
>-{
>- struct kmemcheck_error *e;
>-
>- if (error_count == 0)
>- return NULL;
>-
>- e = &error_fifo[error_rd];
>- if (++error_rd == ARRAY_SIZE(error_fifo))
>- error_rd = 0;
>- --error_count;
>- return e;
>-}
>-
>-void kmemcheck_error_recall(void)
>-{
>- static const char *desc[] = {
>- [KMEMCHECK_SHADOW_UNALLOCATED] = "unallocated",
>- [KMEMCHECK_SHADOW_UNINITIALIZED] = "uninitialized",
>- [KMEMCHECK_SHADOW_INITIALIZED] = "initialized",
>- [KMEMCHECK_SHADOW_FREED] = "freed",
>- };
>-
>- static const char short_desc[] = {
>- [KMEMCHECK_SHADOW_UNALLOCATED] = 'a',
>- [KMEMCHECK_SHADOW_UNINITIALIZED] = 'u',
>- [KMEMCHECK_SHADOW_INITIALIZED] = 'i',
>- [KMEMCHECK_SHADOW_FREED] = 'f',
>- };
>-
>- struct kmemcheck_error *e;
>- unsigned int i;
>-
>- e = error_next_rd();
>- if (!e)
>- return;
>-
>- switch (e->type) {
>- case KMEMCHECK_ERROR_INVALID_ACCESS:
>- printk(KERN_WARNING "WARNING: kmemcheck: Caught %d-bit read from %s memory (%p)\n",
>- 8 * e->size, e->state < ARRAY_SIZE(desc) ?
>- desc[e->state] : "(invalid shadow state)",
>- (void *) e->address);
>-
>- printk(KERN_WARNING);
>- for (i = 0; i < SHADOW_COPY_SIZE; ++i)
>- printk(KERN_CONT "%02x", e->memory_copy[i]);
>- printk(KERN_CONT "\n");
>-
>- printk(KERN_WARNING);
>- for (i = 0; i < SHADOW_COPY_SIZE; ++i) {
>- if (e->shadow_copy[i] < ARRAY_SIZE(short_desc))
>- printk(KERN_CONT " %c", short_desc[e->shadow_copy[i]]);
>- else
>- printk(KERN_CONT " ?");
>- }
>- printk(KERN_CONT "\n");
>- printk(KERN_WARNING "%*c\n", 2 + 2
>- * (int) (e->address & (SHADOW_COPY_SIZE - 1)), '^');
>- break;
>- case KMEMCHECK_ERROR_BUG:
>- printk(KERN_EMERG "ERROR: kmemcheck: Fatal error\n");
>- break;
>- }
>-
>- __show_regs(&e->regs, 1);
>- print_stack_trace(&e->trace, 0);
>-}
>-
>-static void do_wakeup(unsigned long data)
>-{
>- while (error_count > 0)
>- kmemcheck_error_recall();
>-
>- if (error_missed_count > 0) {
>- printk(KERN_WARNING "kmemcheck: Lost %d error reports because "
>- "the queue was too small\n", error_missed_count);
>- error_missed_count = 0;
>- }
>-}
>-
>-static DECLARE_TASKLET(kmemcheck_tasklet, &do_wakeup, 0);
>-
>-/*
>- * Save the context of an error report.
>- */
>-void kmemcheck_error_save(enum kmemcheck_shadow state,
>- unsigned long address, unsigned int size, struct pt_regs *regs)
>-{
>- static unsigned long prev_ip;
>-
>- struct kmemcheck_error *e;
>- void *shadow_copy;
>- void *memory_copy;
>-
>- /* Don't report several adjacent errors from the same EIP. */
>- if (regs->ip == prev_ip)
>- return;
>- prev_ip = regs->ip;
>-
>- e = error_next_wr();
>- if (!e)
>- return;
>-
>- e->type = KMEMCHECK_ERROR_INVALID_ACCESS;
>-
>- e->state = state;
>- e->address = address;
>- e->size = size;
>-
>- /* Save regs */
>- memcpy(&e->regs, regs, sizeof(*regs));
>-
>- /* Save stack trace */
>- e->trace.nr_entries = 0;
>- e->trace.entries = e->trace_entries;
>- e->trace.max_entries = ARRAY_SIZE(e->trace_entries);
>- e->trace.skip = 0;
>- save_stack_trace_regs(regs, &e->trace);
>-
>- /* Round address down to nearest 16 bytes */
>- shadow_copy = kmemcheck_shadow_lookup(address
>- & ~(SHADOW_COPY_SIZE - 1));
>- BUG_ON(!shadow_copy);
>-
>- memcpy(e->shadow_copy, shadow_copy, SHADOW_COPY_SIZE);
>-
>- kmemcheck_show_addr(address);
>- memory_copy = (void *) (address & ~(SHADOW_COPY_SIZE - 1));
>- memcpy(e->memory_copy, memory_copy, SHADOW_COPY_SIZE);
>- kmemcheck_hide_addr(address);
>-
>- tasklet_hi_schedule_first(&kmemcheck_tasklet);
>-}
>-
>-/*
>- * Save the context of a kmemcheck bug.
>- */
>-void kmemcheck_error_save_bug(struct pt_regs *regs)
>-{
>- struct kmemcheck_error *e;
>-
>- e = error_next_wr();
>- if (!e)
>- return;
>-
>- e->type = KMEMCHECK_ERROR_BUG;
>-
>- memcpy(&e->regs, regs, sizeof(*regs));
>-
>- e->trace.nr_entries = 0;
>- e->trace.entries = e->trace_entries;
>- e->trace.max_entries = ARRAY_SIZE(e->trace_entries);
>- e->trace.skip = 1;
>- save_stack_trace(&e->trace);
>-
>- tasklet_hi_schedule_first(&kmemcheck_tasklet);
>-}
>diff --git a/arch/x86/mm/kmemcheck/error.h b/arch/x86/mm/kmemcheck/error.h
>deleted file mode 100644
>index 0efc2e8d0a20..000000000000
>--- a/arch/x86/mm/kmemcheck/error.h
>+++ /dev/null
>@@ -1,15 +0,0 @@
>-#ifndef ARCH__X86__MM__KMEMCHECK__ERROR_H
>-#define ARCH__X86__MM__KMEMCHECK__ERROR_H
>-
>-#include <linux/ptrace.h>
>-
>-#include "shadow.h"
>-
>-void kmemcheck_error_save(enum kmemcheck_shadow state,
>- unsigned long address, unsigned int size, struct pt_regs *regs);
>-
>-void kmemcheck_error_save_bug(struct pt_regs *regs);
>-
>-void kmemcheck_error_recall(void);
>-
>-#endif
>diff --git a/arch/x86/mm/kmemcheck/kmemcheck.c b/arch/x86/mm/kmemcheck/kmemcheck.c
>deleted file mode 100644
>index 4515bae36bbe..000000000000
>--- a/arch/x86/mm/kmemcheck/kmemcheck.c
>+++ /dev/null
>@@ -1,658 +0,0 @@
>-/**
>- * kmemcheck - a heavyweight memory checker for the linux kernel
>- * Copyright (C) 2007, 2008 Vegard Nossum <vegardno@xxxxxxxxxx>
>- * (With a lot of help from Ingo Molnar and Pekka Enberg.)
>- *
>- * This program is free software; you can redistribute it and/or modify
>- * it under the terms of the GNU General Public License (version 2) as
>- * published by the Free Software Foundation.
>- */
>-
>-#include <linux/init.h>
>-#include <linux/interrupt.h>
>-#include <linux/kallsyms.h>
>-#include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
>-#include <linux/mm.h>
>-#include <linux/page-flags.h>
>-#include <linux/percpu.h>
>-#include <linux/ptrace.h>
>-#include <linux/string.h>
>-#include <linux/types.h>
>-
>-#include <asm/cacheflush.h>
>-#include <asm/kmemcheck.h>
>-#include <asm/pgtable.h>
>-#include <asm/tlbflush.h>
>-
>-#include "error.h"
>-#include "opcode.h"
>-#include "pte.h"
>-#include "selftest.h"
>-#include "shadow.h"
>-
>-
>-#ifdef CONFIG_KMEMCHECK_DISABLED_BY_DEFAULT
>-# define KMEMCHECK_ENABLED 0
>-#endif
>-
>-#ifdef CONFIG_KMEMCHECK_ENABLED_BY_DEFAULT
>-# define KMEMCHECK_ENABLED 1
>-#endif
>-
>-#ifdef CONFIG_KMEMCHECK_ONESHOT_BY_DEFAULT
>-# define KMEMCHECK_ENABLED 2
>-#endif
>-
>-int kmemcheck_enabled = KMEMCHECK_ENABLED;
>-
>-int __init kmemcheck_init(void)
>-{
>-#ifdef CONFIG_SMP
>- /*
>- * Limit SMP to use a single CPU. We rely on the fact that this code
>- * runs before SMP is set up.
>- */
>- if (setup_max_cpus > 1) {
>- printk(KERN_INFO
>- "kmemcheck: Limiting number of CPUs to 1.\n");
>- setup_max_cpus = 1;
>- }
>-#endif
>-
>- if (!kmemcheck_selftest()) {
>- printk(KERN_INFO "kmemcheck: self-tests failed; disabling\n");
>- kmemcheck_enabled = 0;
>- return -EINVAL;
>- }
>-
>- printk(KERN_INFO "kmemcheck: Initialized\n");
>- return 0;
>-}
>-
>-early_initcall(kmemcheck_init);
>-
>-/*
>- * We need to parse the kmemcheck= option before any memory is allocated.
>- */
>-static int __init param_kmemcheck(char *str)
>-{
>- int val;
>- int ret;
>-
>- if (!str)
>- return -EINVAL;
>-
>- ret = kstrtoint(str, 0, &val);
>- if (ret)
>- return ret;
>- kmemcheck_enabled = val;
>- return 0;
>-}
>-
>-early_param("kmemcheck", param_kmemcheck);
>-
>-int kmemcheck_show_addr(unsigned long address)
>-{
>- pte_t *pte;
>-
>- pte = kmemcheck_pte_lookup(address);
>- if (!pte)
>- return 0;
>-
>- set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
>- __flush_tlb_one(address);
>- return 1;
>-}
>-
>-int kmemcheck_hide_addr(unsigned long address)
>-{
>- pte_t *pte;
>-
>- pte = kmemcheck_pte_lookup(address);
>- if (!pte)
>- return 0;
>-
>- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
>- __flush_tlb_one(address);
>- return 1;
>-}
>-
>-struct kmemcheck_context {
>- bool busy;
>- int balance;
>-
>- /*
>- * There can be at most two memory operands to an instruction, but
>- * each address can cross a page boundary -- so we may need up to
>- * four addresses that must be hidden/revealed for each fault.
>- */
>- unsigned long addr[4];
>- unsigned long n_addrs;
>- unsigned long flags;
>-
>- /* Data size of the instruction that caused a fault. */
>- unsigned int size;
>-};
>-
>-static DEFINE_PER_CPU(struct kmemcheck_context, kmemcheck_context);
>-
>-bool kmemcheck_active(struct pt_regs *regs)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>-
>- return data->balance > 0;
>-}
>-
>-/* Save an address that needs to be shown/hidden */
>-static void kmemcheck_save_addr(unsigned long addr)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>-
>- BUG_ON(data->n_addrs >= ARRAY_SIZE(data->addr));
>- data->addr[data->n_addrs++] = addr;
>-}
>-
>-static unsigned int kmemcheck_show_all(void)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>- unsigned int i;
>- unsigned int n;
>-
>- n = 0;
>- for (i = 0; i < data->n_addrs; ++i)
>- n += kmemcheck_show_addr(data->addr[i]);
>-
>- return n;
>-}
>-
>-static unsigned int kmemcheck_hide_all(void)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>- unsigned int i;
>- unsigned int n;
>-
>- n = 0;
>- for (i = 0; i < data->n_addrs; ++i)
>- n += kmemcheck_hide_addr(data->addr[i]);
>-
>- return n;
>-}
>-
>-/*
>- * Called from the #PF handler.
>- */
>-void kmemcheck_show(struct pt_regs *regs)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>-
>- BUG_ON(!irqs_disabled());
>-
>- if (unlikely(data->balance != 0)) {
>- kmemcheck_show_all();
>- kmemcheck_error_save_bug(regs);
>- data->balance = 0;
>- return;
>- }
>-
>- /*
>- * None of the addresses actually belonged to kmemcheck. Note that
>- * this is not an error.
>- */
>- if (kmemcheck_show_all() == 0)
>- return;
>-
>- ++data->balance;
>-
>- /*
>- * The IF needs to be cleared as well, so that the faulting
>- * instruction can run "uninterrupted". Otherwise, we might take
>- * an interrupt and start executing that before we've had a chance
>- * to hide the page again.
>- *
>- * NOTE: In the rare case of multiple faults, we must not override
>- * the original flags:
>- */
>- if (!(regs->flags & X86_EFLAGS_TF))
>- data->flags = regs->flags;
>-
>- regs->flags |= X86_EFLAGS_TF;
>- regs->flags &= ~X86_EFLAGS_IF;
>-}
>-
>-/*
>- * Called from the #DB handler.
>- */
>-void kmemcheck_hide(struct pt_regs *regs)
>-{
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>- int n;
>-
>- BUG_ON(!irqs_disabled());
>-
>- if (unlikely(data->balance != 1)) {
>- kmemcheck_show_all();
>- kmemcheck_error_save_bug(regs);
>- data->n_addrs = 0;
>- data->balance = 0;
>-
>- if (!(data->flags & X86_EFLAGS_TF))
>- regs->flags &= ~X86_EFLAGS_TF;
>- if (data->flags & X86_EFLAGS_IF)
>- regs->flags |= X86_EFLAGS_IF;
>- return;
>- }
>-
>- if (kmemcheck_enabled)
>- n = kmemcheck_hide_all();
>- else
>- n = kmemcheck_show_all();
>-
>- if (n == 0)
>- return;
>-
>- --data->balance;
>-
>- data->n_addrs = 0;
>-
>- if (!(data->flags & X86_EFLAGS_TF))
>- regs->flags &= ~X86_EFLAGS_TF;
>- if (data->flags & X86_EFLAGS_IF)
>- regs->flags |= X86_EFLAGS_IF;
>-}
>-
>-void kmemcheck_show_pages(struct page *p, unsigned int n)
>-{
>- unsigned int i;
>-
>- for (i = 0; i < n; ++i) {
>- unsigned long address;
>- pte_t *pte;
>- unsigned int level;
>-
>- address = (unsigned long) page_address(&p[i]);
>- pte = lookup_address(address, &level);
>- BUG_ON(!pte);
>- BUG_ON(level != PG_LEVEL_4K);
>-
>- set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
>- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_HIDDEN));
>- __flush_tlb_one(address);
>- }
>-}
>-
>-bool kmemcheck_page_is_tracked(struct page *p)
>-{
>- /* This will also check the "hidden" flag of the PTE. */
>- return kmemcheck_pte_lookup((unsigned long) page_address(p));
>-}
>-
>-void kmemcheck_hide_pages(struct page *p, unsigned int n)
>-{
>- unsigned int i;
>-
>- for (i = 0; i < n; ++i) {
>- unsigned long address;
>- pte_t *pte;
>- unsigned int level;
>-
>- address = (unsigned long) page_address(&p[i]);
>- pte = lookup_address(address, &level);
>- BUG_ON(!pte);
>- BUG_ON(level != PG_LEVEL_4K);
>-
>- set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
>- set_pte(pte, __pte(pte_val(*pte) | _PAGE_HIDDEN));
>- __flush_tlb_one(address);
>- }
>-}
>-
>-/* Access may NOT cross page boundary */
>-static void kmemcheck_read_strict(struct pt_regs *regs,
>- unsigned long addr, unsigned int size)
>-{
>- void *shadow;
>- enum kmemcheck_shadow status;
>-
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (!shadow)
>- return;
>-
>- kmemcheck_save_addr(addr);
>- status = kmemcheck_shadow_test(shadow, size);
>- if (status == KMEMCHECK_SHADOW_INITIALIZED)
>- return;
>-
>- if (kmemcheck_enabled)
>- kmemcheck_error_save(status, addr, size, regs);
>-
>- if (kmemcheck_enabled == 2)
>- kmemcheck_enabled = 0;
>-
>- /* Don't warn about it again. */
>- kmemcheck_shadow_set(shadow, size);
>-}
>-
>-bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size)
>-{
>- enum kmemcheck_shadow status;
>- void *shadow;
>-
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (!shadow)
>- return true;
>-
>- status = kmemcheck_shadow_test_all(shadow, size);
>-
>- return status == KMEMCHECK_SHADOW_INITIALIZED;
>-}
>-
>-/* Access may cross page boundary */
>-static void kmemcheck_read(struct pt_regs *regs,
>- unsigned long addr, unsigned int size)
>-{
>- unsigned long page = addr & PAGE_MASK;
>- unsigned long next_addr = addr + size - 1;
>- unsigned long next_page = next_addr & PAGE_MASK;
>-
>- if (likely(page == next_page)) {
>- kmemcheck_read_strict(regs, addr, size);
>- return;
>- }
>-
>- /*
>- * What we do is basically to split the access across the
>- * two pages and handle each part separately. Yes, this means
>- * that we may now see reads that are 3 + 5 bytes, for
>- * example (and if both are uninitialized, there will be two
>- * reports), but it makes the code a lot simpler.
>- */
>- kmemcheck_read_strict(regs, addr, next_page - addr);
>- kmemcheck_read_strict(regs, next_page, next_addr - next_page);
>-}
>-
>-static void kmemcheck_write_strict(struct pt_regs *regs,
>- unsigned long addr, unsigned int size)
>-{
>- void *shadow;
>-
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (!shadow)
>- return;
>-
>- kmemcheck_save_addr(addr);
>- kmemcheck_shadow_set(shadow, size);
>-}
>-
>-static void kmemcheck_write(struct pt_regs *regs,
>- unsigned long addr, unsigned int size)
>-{
>- unsigned long page = addr & PAGE_MASK;
>- unsigned long next_addr = addr + size - 1;
>- unsigned long next_page = next_addr & PAGE_MASK;
>-
>- if (likely(page == next_page)) {
>- kmemcheck_write_strict(regs, addr, size);
>- return;
>- }
>-
>- /* See comment in kmemcheck_read(). */
>- kmemcheck_write_strict(regs, addr, next_page - addr);
>- kmemcheck_write_strict(regs, next_page, next_addr - next_page);
>-}
>-
>-/*
>- * Copying is hard. We have two addresses, each of which may be split across
>- * a page (and each page will have different shadow addresses).
>- */
>-static void kmemcheck_copy(struct pt_regs *regs,
>- unsigned long src_addr, unsigned long dst_addr, unsigned int size)
>-{
>- uint8_t shadow[8];
>- enum kmemcheck_shadow status;
>-
>- unsigned long page;
>- unsigned long next_addr;
>- unsigned long next_page;
>-
>- uint8_t *x;
>- unsigned int i;
>- unsigned int n;
>-
>- BUG_ON(size > sizeof(shadow));
>-
>- page = src_addr & PAGE_MASK;
>- next_addr = src_addr + size - 1;
>- next_page = next_addr & PAGE_MASK;
>-
>- if (likely(page == next_page)) {
>- /* Same page */
>- x = kmemcheck_shadow_lookup(src_addr);
>- if (x) {
>- kmemcheck_save_addr(src_addr);
>- for (i = 0; i < size; ++i)
>- shadow[i] = x[i];
>- } else {
>- for (i = 0; i < size; ++i)
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>- } else {
>- n = next_page - src_addr;
>- BUG_ON(n > sizeof(shadow));
>-
>- /* First page */
>- x = kmemcheck_shadow_lookup(src_addr);
>- if (x) {
>- kmemcheck_save_addr(src_addr);
>- for (i = 0; i < n; ++i)
>- shadow[i] = x[i];
>- } else {
>- /* Not tracked */
>- for (i = 0; i < n; ++i)
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>-
>- /* Second page */
>- x = kmemcheck_shadow_lookup(next_page);
>- if (x) {
>- kmemcheck_save_addr(next_page);
>- for (i = n; i < size; ++i)
>- shadow[i] = x[i - n];
>- } else {
>- /* Not tracked */
>- for (i = n; i < size; ++i)
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>- }
>-
>- page = dst_addr & PAGE_MASK;
>- next_addr = dst_addr + size - 1;
>- next_page = next_addr & PAGE_MASK;
>-
>- if (likely(page == next_page)) {
>- /* Same page */
>- x = kmemcheck_shadow_lookup(dst_addr);
>- if (x) {
>- kmemcheck_save_addr(dst_addr);
>- for (i = 0; i < size; ++i) {
>- x[i] = shadow[i];
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>- }
>- } else {
>- n = next_page - dst_addr;
>- BUG_ON(n > sizeof(shadow));
>-
>- /* First page */
>- x = kmemcheck_shadow_lookup(dst_addr);
>- if (x) {
>- kmemcheck_save_addr(dst_addr);
>- for (i = 0; i < n; ++i) {
>- x[i] = shadow[i];
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>- }
>-
>- /* Second page */
>- x = kmemcheck_shadow_lookup(next_page);
>- if (x) {
>- kmemcheck_save_addr(next_page);
>- for (i = n; i < size; ++i) {
>- x[i - n] = shadow[i];
>- shadow[i] = KMEMCHECK_SHADOW_INITIALIZED;
>- }
>- }
>- }
>-
>- status = kmemcheck_shadow_test(shadow, size);
>- if (status == KMEMCHECK_SHADOW_INITIALIZED)
>- return;
>-
>- if (kmemcheck_enabled)
>- kmemcheck_error_save(status, src_addr, size, regs);
>-
>- if (kmemcheck_enabled == 2)
>- kmemcheck_enabled = 0;
>-}
>-
>-enum kmemcheck_method {
>- KMEMCHECK_READ,
>- KMEMCHECK_WRITE,
>-};
>-
>-static void kmemcheck_access(struct pt_regs *regs,
>- unsigned long fallback_address, enum kmemcheck_method fallback_method)
>-{
>- const uint8_t *insn;
>- const uint8_t *insn_primary;
>- unsigned int size;
>-
>- struct kmemcheck_context *data = this_cpu_ptr(&kmemcheck_context);
>-
>- /* Recursive fault -- ouch. */
>- if (data->busy) {
>- kmemcheck_show_addr(fallback_address);
>- kmemcheck_error_save_bug(regs);
>- return;
>- }
>-
>- data->busy = true;
>-
>- insn = (const uint8_t *) regs->ip;
>- insn_primary = kmemcheck_opcode_get_primary(insn);
>-
>- kmemcheck_opcode_decode(insn, &size);
>-
>- switch (insn_primary[0]) {
>-#ifdef CONFIG_KMEMCHECK_BITOPS_OK
>- /* AND, OR, XOR */
>- /*
>- * Unfortunately, these instructions have to be excluded from
>- * our regular checking since they access only some (and not
>- * all) bits. This clears out "bogus" bitfield-access warnings.
>- */
>- case 0x80:
>- case 0x81:
>- case 0x82:
>- case 0x83:
>- switch ((insn_primary[1] >> 3) & 7) {
>- /* OR */
>- case 1:
>- /* AND */
>- case 4:
>- /* XOR */
>- case 6:
>- kmemcheck_write(regs, fallback_address, size);
>- goto out;
>-
>- /* ADD */
>- case 0:
>- /* ADC */
>- case 2:
>- /* SBB */
>- case 3:
>- /* SUB */
>- case 5:
>- /* CMP */
>- case 7:
>- break;
>- }
>- break;
>-#endif
>-
>- /* MOVS, MOVSB, MOVSW, MOVSD */
>- case 0xa4:
>- case 0xa5:
>- /*
>- * These instructions are special because they take two
>- * addresses, but we only get one page fault.
>- */
>- kmemcheck_copy(regs, regs->si, regs->di, size);
>- goto out;
>-
>- /* CMPS, CMPSB, CMPSW, CMPSD */
>- case 0xa6:
>- case 0xa7:
>- kmemcheck_read(regs, regs->si, size);
>- kmemcheck_read(regs, regs->di, size);
>- goto out;
>- }
>-
>- /*
>- * If the opcode isn't special in any way, we use the data from the
>- * page fault handler to determine the address and type of memory
>- * access.
>- */
>- switch (fallback_method) {
>- case KMEMCHECK_READ:
>- kmemcheck_read(regs, fallback_address, size);
>- goto out;
>- case KMEMCHECK_WRITE:
>- kmemcheck_write(regs, fallback_address, size);
>- goto out;
>- }
>-
>-out:
>- data->busy = false;
>-}
>-
>-bool kmemcheck_fault(struct pt_regs *regs, unsigned long address,
>- unsigned long error_code)
>-{
>- pte_t *pte;
>-
>- /*
>- * XXX: Is it safe to assume that memory accesses from virtual 86
>- * mode or non-kernel code segments will _never_ access kernel
>- * memory (e.g. tracked pages)? For now, we need this to avoid
>- * invoking kmemcheck for PnP BIOS calls.
>- */
>- if (regs->flags & X86_VM_MASK)
>- return false;
>- if (regs->cs != __KERNEL_CS)
>- return false;
>-
>- pte = kmemcheck_pte_lookup(address);
>- if (!pte)
>- return false;
>-
>- WARN_ON_ONCE(in_nmi());
>-
>- if (error_code & 2)
>- kmemcheck_access(regs, address, KMEMCHECK_WRITE);
>- else
>- kmemcheck_access(regs, address, KMEMCHECK_READ);
>-
>- kmemcheck_show(regs);
>- return true;
>-}
>-
>-bool kmemcheck_trap(struct pt_regs *regs)
>-{
>- if (!kmemcheck_active(regs))
>- return false;
>-
>- /* We're done. */
>- kmemcheck_hide(regs);
>- return true;
>-}
>diff --git a/arch/x86/mm/kmemcheck/opcode.c b/arch/x86/mm/kmemcheck/opcode.c
>deleted file mode 100644
>index 324aa3f07237..000000000000
>--- a/arch/x86/mm/kmemcheck/opcode.c
>+++ /dev/null
>@@ -1,106 +0,0 @@
>-#include <linux/types.h>
>-
>-#include "opcode.h"
>-
>-static bool opcode_is_prefix(uint8_t b)
>-{
>- return
>- /* Group 1 */
>- b == 0xf0 || b == 0xf2 || b == 0xf3
>- /* Group 2 */
>- || b == 0x2e || b == 0x36 || b == 0x3e || b == 0x26
>- || b == 0x64 || b == 0x65
>- /* Group 3 */
>- || b == 0x66
>- /* Group 4 */
>- || b == 0x67;
>-}
>-
>-#ifdef CONFIG_X86_64
>-static bool opcode_is_rex_prefix(uint8_t b)
>-{
>- return (b & 0xf0) == 0x40;
>-}
>-#else
>-static bool opcode_is_rex_prefix(uint8_t b)
>-{
>- return false;
>-}
>-#endif
>-
>-#define REX_W (1 << 3)
>-
>-/*
>- * This is a VERY crude opcode decoder. We only need to find the size of the
>- * load/store that caused our #PF and this should work for all the opcodes
>- * that we care about. Moreover, the ones who invented this instruction set
>- * should be shot.
>- */
>-void kmemcheck_opcode_decode(const uint8_t *op, unsigned int *size)
>-{
>- /* Default operand size */
>- int operand_size_override = 4;
>-
>- /* prefixes */
>- for (; opcode_is_prefix(*op); ++op) {
>- if (*op == 0x66)
>- operand_size_override = 2;
>- }
>-
>- /* REX prefix */
>- if (opcode_is_rex_prefix(*op)) {
>- uint8_t rex = *op;
>-
>- ++op;
>- if (rex & REX_W) {
>- switch (*op) {
>- case 0x63:
>- *size = 4;
>- return;
>- case 0x0f:
>- ++op;
>-
>- switch (*op) {
>- case 0xb6:
>- case 0xbe:
>- *size = 1;
>- return;
>- case 0xb7:
>- case 0xbf:
>- *size = 2;
>- return;
>- }
>-
>- break;
>- }
>-
>- *size = 8;
>- return;
>- }
>- }
>-
>- /* escape opcode */
>- if (*op == 0x0f) {
>- ++op;
>-
>- /*
>- * This is move with zero-extend and sign-extend, respectively;
>- * we don't have to think about 0xb6/0xbe, because this is
>- * already handled in the conditional below.
>- */
>- if (*op == 0xb7 || *op == 0xbf)
>- operand_size_override = 2;
>- }
>-
>- *size = (*op & 1) ? operand_size_override : 1;
>-}
>-
>-const uint8_t *kmemcheck_opcode_get_primary(const uint8_t *op)
>-{
>- /* skip prefixes */
>- while (opcode_is_prefix(*op))
>- ++op;
>- if (opcode_is_rex_prefix(*op))
>- ++op;
>- return op;
>-}
>diff --git a/arch/x86/mm/kmemcheck/opcode.h b/arch/x86/mm/kmemcheck/opcode.h
>deleted file mode 100644
>index 6956aad66b5b..000000000000
>--- a/arch/x86/mm/kmemcheck/opcode.h
>+++ /dev/null
>@@ -1,9 +0,0 @@
>-#ifndef ARCH__X86__MM__KMEMCHECK__OPCODE_H
>-#define ARCH__X86__MM__KMEMCHECK__OPCODE_H
>-
>-#include <linux/types.h>
>-
>-void kmemcheck_opcode_decode(const uint8_t *op, unsigned int *size);
>-const uint8_t *kmemcheck_opcode_get_primary(const uint8_t *op);
>-
>-#endif
>diff --git a/arch/x86/mm/kmemcheck/pte.c b/arch/x86/mm/kmemcheck/pte.c
>deleted file mode 100644
>index 4ead26eeaf96..000000000000
>--- a/arch/x86/mm/kmemcheck/pte.c
>+++ /dev/null
>@@ -1,22 +0,0 @@
>-#include <linux/mm.h>
>-
>-#include <asm/pgtable.h>
>-
>-#include "pte.h"
>-
>-pte_t *kmemcheck_pte_lookup(unsigned long address)
>-{
>- pte_t *pte;
>- unsigned int level;
>-
>- pte = lookup_address(address, &level);
>- if (!pte)
>- return NULL;
>- if (level != PG_LEVEL_4K)
>- return NULL;
>- if (!pte_hidden(*pte))
>- return NULL;
>-
>- return pte;
>-}
>-
>diff --git a/arch/x86/mm/kmemcheck/pte.h b/arch/x86/mm/kmemcheck/pte.h
>deleted file mode 100644
>index 9f5966456492..000000000000
>--- a/arch/x86/mm/kmemcheck/pte.h
>+++ /dev/null
>@@ -1,10 +0,0 @@
>-#ifndef ARCH__X86__MM__KMEMCHECK__PTE_H
>-#define ARCH__X86__MM__KMEMCHECK__PTE_H
>-
>-#include <linux/mm.h>
>-
>-#include <asm/pgtable.h>
>-
>-pte_t *kmemcheck_pte_lookup(unsigned long address);
>-
>-#endif
>diff --git a/arch/x86/mm/kmemcheck/selftest.c b/arch/x86/mm/kmemcheck/selftest.c
>deleted file mode 100644
>index aef7140c0063..000000000000
>--- a/arch/x86/mm/kmemcheck/selftest.c
>+++ /dev/null
>@@ -1,70 +0,0 @@
>-#include <linux/bug.h>
>-#include <linux/kernel.h>
>-
>-#include "opcode.h"
>-#include "selftest.h"
>-
>-struct selftest_opcode {
>- unsigned int expected_size;
>- const uint8_t *insn;
>- const char *desc;
>-};
>-
>-static const struct selftest_opcode selftest_opcodes[] = {
>- /* REP MOVS */
>- {1, "\xf3\xa4", "rep movsb <mem8>, <mem8>"},
>- {4, "\xf3\xa5", "rep movsl <mem32>, <mem32>"},
>-
>- /* MOVZX / MOVZXD */
>- {1, "\x66\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg16>"},
>- {1, "\x0f\xb6\x51\xf8", "movzwq <mem8>, <reg32>"},
>-
>- /* MOVSX / MOVSXD */
>- {1, "\x66\x0f\xbe\x51\xf8", "movswq <mem8>, <reg16>"},
>- {1, "\x0f\xbe\x51\xf8", "movswq <mem8>, <reg32>"},
>-
>-#ifdef CONFIG_X86_64
>- /* MOVZX / MOVZXD */
>- {1, "\x49\x0f\xb6\x51\xf8", "movzbq <mem8>, <reg64>"},
>- {2, "\x49\x0f\xb7\x51\xf8", "movzbq <mem16>, <reg64>"},
>-
>- /* MOVSX / MOVSXD */
>- {1, "\x49\x0f\xbe\x51\xf8", "movsbq <mem8>, <reg64>"},
>- {2, "\x49\x0f\xbf\x51\xf8", "movsbq <mem16>, <reg64>"},
>- {4, "\x49\x63\x51\xf8", "movslq <mem32>, <reg64>"},
>-#endif
>-};
>-
>-static bool selftest_opcode_one(const struct selftest_opcode *op)
>-{
>- unsigned size;
>-
>- kmemcheck_opcode_decode(op->insn, &size);
>-
>- if (size == op->expected_size)
>- return true;
>-
>- printk(KERN_WARNING "kmemcheck: opcode %s: expected size %d, got %d\n",
>- op->desc, op->expected_size, size);
>- return false;
>-}
>-
>-static bool selftest_opcodes_all(void)
>-{
>- bool pass = true;
>- unsigned int i;
>-
>- for (i = 0; i < ARRAY_SIZE(selftest_opcodes); ++i)
>- pass = pass && selftest_opcode_one(&selftest_opcodes[i]);
>-
>- return pass;
>-}
>-
>-bool kmemcheck_selftest(void)
>-{
>- bool pass = true;
>-
>- pass = pass && selftest_opcodes_all();
>-
>- return pass;
>-}
>diff --git a/arch/x86/mm/kmemcheck/selftest.h b/arch/x86/mm/kmemcheck/selftest.h
>deleted file mode 100644
>index 8fed4fe11f95..000000000000
>--- a/arch/x86/mm/kmemcheck/selftest.h
>+++ /dev/null
>@@ -1,6 +0,0 @@
>-#ifndef ARCH_X86_MM_KMEMCHECK_SELFTEST_H
>-#define ARCH_X86_MM_KMEMCHECK_SELFTEST_H
>-
>-bool kmemcheck_selftest(void);
>-
>-#endif
>diff --git a/arch/x86/mm/kmemcheck/shadow.c b/arch/x86/mm/kmemcheck/shadow.c
>deleted file mode 100644
>index c2638a7d2c10..000000000000
>--- a/arch/x86/mm/kmemcheck/shadow.c
>+++ /dev/null
>@@ -1,173 +0,0 @@
>-#include <linux/kmemcheck.h>
>-#include <linux/export.h>
>-#include <linux/mm.h>
>-
>-#include <asm/page.h>
>-#include <asm/pgtable.h>
>-
>-#include "pte.h"
>-#include "shadow.h"
>-
>-/*
>- * Return the shadow address for the given address. Returns NULL if the
>- * address is not tracked.
>- *
>- * We need to be extremely careful not to follow any invalid pointers,
>- * because this function can be called for *any* possible address.
>- */
>-void *kmemcheck_shadow_lookup(unsigned long address)
>-{
>- pte_t *pte;
>- struct page *page;
>-
>- if (!virt_addr_valid(address))
>- return NULL;
>-
>- pte = kmemcheck_pte_lookup(address);
>- if (!pte)
>- return NULL;
>-
>- page = virt_to_page(address);
>- if (!page->shadow)
>- return NULL;
>- return page->shadow + (address & (PAGE_SIZE - 1));
>-}
>-
>-static void mark_shadow(void *address, unsigned int n,
>- enum kmemcheck_shadow status)
>-{
>- unsigned long addr = (unsigned long) address;
>- unsigned long last_addr = addr + n - 1;
>- unsigned long page = addr & PAGE_MASK;
>- unsigned long last_page = last_addr & PAGE_MASK;
>- unsigned int first_n;
>- void *shadow;
>-
>- /* If the memory range crosses a page boundary, stop there. */
>- if (page == last_page)
>- first_n = n;
>- else
>- first_n = page + PAGE_SIZE - addr;
>-
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (shadow)
>- memset(shadow, status, first_n);
>-
>- addr += first_n;
>- n -= first_n;
>-
>- /* Do full-page memset()s. */
>- while (n >= PAGE_SIZE) {
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (shadow)
>- memset(shadow, status, PAGE_SIZE);
>-
>- addr += PAGE_SIZE;
>- n -= PAGE_SIZE;
>- }
>-
>- /* Do the remaining page, if any. */
>- if (n > 0) {
>- shadow = kmemcheck_shadow_lookup(addr);
>- if (shadow)
>- memset(shadow, status, n);
>- }
>-}
>-
>-void kmemcheck_mark_unallocated(void *address, unsigned int n)
>-{
>- mark_shadow(address, n, KMEMCHECK_SHADOW_UNALLOCATED);
>-}
>-
>-void kmemcheck_mark_uninitialized(void *address, unsigned int n)
>-{
>- mark_shadow(address, n, KMEMCHECK_SHADOW_UNINITIALIZED);
>-}
>-
>-/*
>- * Fill the shadow memory of the given address such that the memory at that
>- * address is marked as being initialized.
>- */
>-void kmemcheck_mark_initialized(void *address, unsigned int n)
>-{
>- mark_shadow(address, n, KMEMCHECK_SHADOW_INITIALIZED);
>-}
>-EXPORT_SYMBOL_GPL(kmemcheck_mark_initialized);
>-
>-void kmemcheck_mark_freed(void *address, unsigned int n)
>-{
>- mark_shadow(address, n, KMEMCHECK_SHADOW_FREED);
>-}
>-
>-void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n)
>-{
>- unsigned int i;
>-
>- for (i = 0; i < n; ++i)
>- kmemcheck_mark_unallocated(page_address(&p[i]), PAGE_SIZE);
>-}
>-
>-void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n)
>-{
>- unsigned int i;
>-
>- for (i = 0; i < n; ++i)
>- kmemcheck_mark_uninitialized(page_address(&p[i]), PAGE_SIZE);
>-}
>-
>-void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n)
>-{
>- unsigned int i;
>-
>- for (i = 0; i < n; ++i)
>- kmemcheck_mark_initialized(page_address(&p[i]), PAGE_SIZE);
>-}
>-
>-enum kmemcheck_shadow kmemcheck_shadow_test(void *shadow, unsigned int size)
>-{
>-#ifdef CONFIG_KMEMCHECK_PARTIAL_OK
>- uint8_t *x;
>- unsigned int i;
>-
>- x = shadow;
>-
>- /*
>- * Make sure _some_ bytes are initialized. Gcc frequently generates
>- * code to access neighboring bytes.
>- */
>- for (i = 0; i < size; ++i) {
>- if (x[i] == KMEMCHECK_SHADOW_INITIALIZED)
>- return x[i];
>- }
>-
>- return x[0];
>-#else
>- return kmemcheck_shadow_test_all(shadow, size);
>-#endif
>-}
>-
>-enum kmemcheck_shadow kmemcheck_shadow_test_all(void *shadow, unsigned int size)
>-{
>- uint8_t *x;
>- unsigned int i;
>-
>- x = shadow;
>-
>- /* All bytes must be initialized. */
>- for (i = 0; i < size; ++i) {
>- if (x[i] != KMEMCHECK_SHADOW_INITIALIZED)
>- return x[i];
>- }
>-
>- return x[0];
>-}
>-
>-void kmemcheck_shadow_set(void *shadow, unsigned int size)
>-{
>- uint8_t *x;
>- unsigned int i;
>-
>- x = shadow;
>- for (i = 0; i < size; ++i)
>- x[i] = KMEMCHECK_SHADOW_INITIALIZED;
>-}
>diff --git a/arch/x86/mm/kmemcheck/shadow.h b/arch/x86/mm/kmemcheck/shadow.h
>deleted file mode 100644
>index ff0b2f70fbcb..000000000000
>--- a/arch/x86/mm/kmemcheck/shadow.h
>+++ /dev/null
>@@ -1,18 +0,0 @@
>-#ifndef ARCH__X86__MM__KMEMCHECK__SHADOW_H
>-#define ARCH__X86__MM__KMEMCHECK__SHADOW_H
>-
>-enum kmemcheck_shadow {
>- KMEMCHECK_SHADOW_UNALLOCATED,
>- KMEMCHECK_SHADOW_UNINITIALIZED,
>- KMEMCHECK_SHADOW_INITIALIZED,
>- KMEMCHECK_SHADOW_FREED,
>-};
>-
>-void *kmemcheck_shadow_lookup(unsigned long address);
>-
>-enum kmemcheck_shadow kmemcheck_shadow_test(void *shadow, unsigned int size);
>-enum kmemcheck_shadow kmemcheck_shadow_test_all(void *shadow,
>- unsigned int size);
>-void kmemcheck_shadow_set(void *shadow, unsigned int size);
>-
>-#endif
>diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
>index dfb7d657cf43..3ed9a08885c5 100644
>--- a/arch/x86/mm/pageattr.c
>+++ b/arch/x86/mm/pageattr.c
>@@ -753,7 +753,7 @@ static int split_large_page(struct cpa_data *cpa, pte_t *kpte,
>
> if (!debug_pagealloc_enabled())
> spin_unlock(&cpa_lock);
>- base = alloc_pages(GFP_KERNEL | __GFP_NOTRACK, 0);
>+ base = alloc_pages(GFP_KERNEL, 0);
> if (!debug_pagealloc_enabled())
> spin_lock(&cpa_lock);
> if (!base)
>@@ -904,7 +904,7 @@ static void unmap_pud_range(p4d_t *p4d, unsigned long start, unsigned long end)
>
> static int alloc_pte_page(pmd_t *pmd)
> {
>- pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
>+ pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
> if (!pte)
> return -1;
>
>@@ -914,7 +914,7 @@ static int alloc_pte_page(pmd_t *pmd)
>
> static int alloc_pmd_page(pud_t *pud)
> {
>- pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
>+ pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
> if (!pmd)
> return -1;
>
>@@ -1120,7 +1120,7 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
> pgd_entry = cpa->pgd + pgd_index(addr);
>
> if (pgd_none(*pgd_entry)) {
>- p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
>+ p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL);
> if (!p4d)
> return -1;
>
>@@ -1132,7 +1132,7 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
> */
> p4d = p4d_offset(pgd_entry, addr);
> if (p4d_none(*p4d)) {
>- pud = (pud_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
>+ pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
> if (!pud)
> return -1;
>
>diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
>index b372f3442bbf..dc686d2fc59a 100644
>--- a/arch/x86/mm/pgtable.c
>+++ b/arch/x86/mm/pgtable.c
>@@ -6,7 +6,7 @@
> #include <asm/fixmap.h>
> #include <asm/mtrr.h>
>
>-#define PGALLOC_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | __GFP_ZERO)
>+#define PGALLOC_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
>
> #ifdef CONFIG_HIGHPTE
> #define PGALLOC_USER_GFP __GFP_HIGHMEM
>diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
>index 12e83888e5b9..fe3aebb87468 100644
>--- a/arch/x86/platform/efi/efi_64.c
>+++ b/arch/x86/platform/efi/efi_64.c
>@@ -205,7 +205,7 @@ int __init efi_alloc_page_tables(void)
> if (efi_enabled(EFI_OLD_MEMMAP))
> return 0;
>
>- gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO;
>+ gfp_mask = GFP_KERNEL | __GFP_ZERO;
> efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
> if (!efi_pgd)
> return -ENOMEM;
>diff --git a/crypto/xor.c b/crypto/xor.c
>index 263af9fb45ea..bce9fe7af40a 100644
>--- a/crypto/xor.c
>+++ b/crypto/xor.c
>@@ -122,12 +122,7 @@ calibrate_xor_blocks(void)
> goto out;
> }
>
>- /*
>- * Note: Since the memory is not actually used for _anything_ but to
>- * test the XOR speed, we don't really want kmemcheck to warn about
>- * reading uninitialized bytes here.
>- */
>- b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 2);
>+ b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
> if (!b1) {
> printk(KERN_WARNING "xor: Yikes! No memory available.\n");
> return -ENOMEM;
>diff --git a/drivers/char/random.c b/drivers/char/random.c
>index 8ad92707e45f..ea0115cf5fc0 100644
>--- a/drivers/char/random.c
>+++ b/drivers/char/random.c
>@@ -259,7 +259,6 @@
> #include <linux/cryptohash.h>
> #include <linux/fips.h>
> #include <linux/ptrace.h>
>-#include <linux/kmemcheck.h>
> #include <linux/workqueue.h>
> #include <linux/irq.h>
> #include <linux/syscalls.h>
>diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
>index 1922cb8f6b88..1c5b7aec13d4 100644
>--- a/drivers/misc/c2port/core.c
>+++ b/drivers/misc/c2port/core.c
>@@ -15,7 +15,6 @@
> #include <linux/errno.h>
> #include <linux/err.h>
> #include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
> #include <linux/ctype.h>
> #include <linux/delay.h>
> #include <linux/idr.h>
>@@ -904,7 +903,6 @@ struct c2port_device *c2port_device_register(char *name,
> return ERR_PTR(-EINVAL);
>
> c2dev = kmalloc(sizeof(struct c2port_device), GFP_KERNEL);
>- kmemcheck_annotate_bitfield(c2dev, flags);
> if (unlikely(!c2dev))
> return ERR_PTR(-ENOMEM);
>
>diff --git a/fs/dcache.c b/fs/dcache.c
>index f90141387f01..96f3af133ee6 100644
>--- a/fs/dcache.c
>+++ b/fs/dcache.c
>@@ -2705,8 +2705,6 @@ static void swap_names(struct dentry *dentry, struct dentry *target)
> */
> unsigned int i;
> BUILD_BUG_ON(!IS_ALIGNED(DNAME_INLINE_LEN, sizeof(long)));
>- kmemcheck_mark_initialized(dentry->d_iname, DNAME_INLINE_LEN);
>- kmemcheck_mark_initialized(target->d_iname, DNAME_INLINE_LEN);
> for (i = 0; i < DNAME_INLINE_LEN / sizeof(long); i++) {
> swap(((long *) &dentry->d_iname)[i],
> ((long *) &target->d_iname)[i]);
>diff --git a/include/linux/c2port.h b/include/linux/c2port.h
>index 4efabcb51347..f2736348ca26 100644
>--- a/include/linux/c2port.h
>+++ b/include/linux/c2port.h
>@@ -9,8 +9,6 @@
> * the Free Software Foundation
> */
>
>-#include <linux/kmemcheck.h>
>-
> #define C2PORT_NAME_LEN 32
>
> struct device;
>@@ -22,10 +20,8 @@ struct device;
> /* Main struct */
> struct c2port_ops;
> struct c2port_device {
>- kmemcheck_bitfield_begin(flags);
> unsigned int access:1;
> unsigned int flash_access:1;
>- kmemcheck_bitfield_end(flags);
>
> int id;
> char name[C2PORT_NAME_LEN];
>diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
>index 29ce9815da87..2911389bc147 100644
>--- a/include/linux/dma-mapping.h
>+++ b/include/linux/dma-mapping.h
>@@ -8,7 +8,6 @@
> #include <linux/dma-debug.h>
> #include <linux/dma-direction.h>
> #include <linux/scatterlist.h>
>-#include <linux/kmemcheck.h>
> #include <linux/bug.h>
> #include <linux/mem_encrypt.h>
>
>@@ -229,7 +228,6 @@ static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
> const struct dma_map_ops *ops = get_dma_ops(dev);
> dma_addr_t addr;
>
>- kmemcheck_mark_initialized(ptr, size);
> BUG_ON(!valid_dma_direction(dir));
> addr = ops->map_page(dev, virt_to_page(ptr),
> offset_in_page(ptr), size,
>@@ -262,11 +260,8 @@ static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
> unsigned long attrs)
> {
> const struct dma_map_ops *ops = get_dma_ops(dev);
>- int i, ents;
>- struct scatterlist *s;
>+ int ents;
>
>- for_each_sg(sg, s, nents, i)
>- kmemcheck_mark_initialized(sg_virt(s), s->length);
> BUG_ON(!valid_dma_direction(dir));
> ents = ops->map_sg(dev, sg, nents, dir, attrs);
> BUG_ON(ents < 0);
>@@ -296,7 +291,6 @@ static inline dma_addr_t dma_map_page_attrs(struct device *dev,
> const struct dma_map_ops *ops = get_dma_ops(dev);
> dma_addr_t addr;
>
>- kmemcheck_mark_initialized(page_address(page) + offset, size);
> BUG_ON(!valid_dma_direction(dir));
> addr = ops->map_page(dev, page, offset, size, dir, attrs);
> debug_dma_map_page(dev, page, offset, size, dir, addr, false);
>diff --git a/include/linux/filter.h b/include/linux/filter.h
>index d29e58fde364..9a0022cd70c6 100644
>--- a/include/linux/filter.h
>+++ b/include/linux/filter.h
>@@ -453,13 +453,11 @@ struct bpf_binary_header {
>
> struct bpf_prog {
> u16 pages; /* Number of allocated pages */
>- kmemcheck_bitfield_begin(meta);
> u16 jited:1, /* Is our filter JIT'ed? */
> locked:1, /* Program image locked? */
> gpl_compatible:1, /* Is filter GPL compatible? */
> cb_access:1, /* Is control block accessed? */
> dst_needed:1; /* Do we need dst entry? */
>- kmemcheck_bitfield_end(meta);
> enum bpf_prog_type type; /* Type of BPF program */
> u32 len; /* Number of filter blocks */
> u32 jited_len; /* Size of jited insns in bytes */
>diff --git a/include/linux/gfp.h b/include/linux/gfp.h
>index f780718b7391..3427fb8d936a 100644
>--- a/include/linux/gfp.h
>+++ b/include/linux/gfp.h
>@@ -36,7 +36,6 @@ struct vm_area_struct;
> #define ___GFP_THISNODE 0x40000u
> #define ___GFP_ATOMIC 0x80000u
> #define ___GFP_ACCOUNT 0x100000u
>-#define ___GFP_NOTRACK 0x200000u
> #define ___GFP_DIRECT_RECLAIM 0x400000u
> #define ___GFP_WRITE 0x800000u
> #define ___GFP_KSWAPD_RECLAIM 0x1000000u
>@@ -200,19 +199,11 @@ struct vm_area_struct;
> * __GFP_COMP address compound page metadata.
> *
> * __GFP_ZERO returns a zeroed page on success.
>- *
>- * __GFP_NOTRACK avoids tracking with kmemcheck.
>- *
>- * __GFP_NOTRACK_FALSE_POSITIVE is an alias of __GFP_NOTRACK. It's a means of
>- * distinguishing in the source between false positives and allocations that
>- * cannot be supported (e.g. page tables).
> */
> #define __GFP_COLD ((__force gfp_t)___GFP_COLD)
> #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN)
> #define __GFP_COMP ((__force gfp_t)___GFP_COMP)
> #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)
>-#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK)
>-#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
>
> /* Disable lockdep for GFP context tracking */
> #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
>diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
>index 59ba11661b6e..0cca55dd19ba 100644
>--- a/include/linux/interrupt.h
>+++ b/include/linux/interrupt.h
>@@ -593,21 +593,6 @@ static inline void tasklet_hi_schedule(struct tasklet_struct *t)
> __tasklet_hi_schedule(t);
> }
>
>-extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
>-
>-/*
>- * This version avoids touching any other tasklets. Needed for kmemcheck
>- * in order not to take any page faults while enqueueing this tasklet;
>- * consider VERY carefully whether you really need this or
>- * tasklet_hi_schedule()...
>- */
>-static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
>-{
>- if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
>- __tasklet_hi_schedule_first(t);
>-}
>-
>-
> static inline void tasklet_disable_nosync(struct tasklet_struct *t)
> {
> atomic_inc(&t->count);
>diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h
>deleted file mode 100644
>index 39f8453239f7..000000000000
>--- a/include/linux/kmemcheck.h
>+++ /dev/null
>@@ -1,171 +0,0 @@
>-#ifndef LINUX_KMEMCHECK_H
>-#define LINUX_KMEMCHECK_H
>-
>-#include <linux/mm_types.h>
>-#include <linux/types.h>
>-
>-#ifdef CONFIG_KMEMCHECK
>-extern int kmemcheck_enabled;
>-
>-/* The slab-related functions. */
>-void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node);
>-void kmemcheck_free_shadow(struct page *page, int order);
>-void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
>- size_t size);
>-void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size);
>-
>-void kmemcheck_pagealloc_alloc(struct page *p, unsigned int order,
>- gfp_t gfpflags);
>-
>-void kmemcheck_show_pages(struct page *p, unsigned int n);
>-void kmemcheck_hide_pages(struct page *p, unsigned int n);
>-
>-bool kmemcheck_page_is_tracked(struct page *p);
>-
>-void kmemcheck_mark_unallocated(void *address, unsigned int n);
>-void kmemcheck_mark_uninitialized(void *address, unsigned int n);
>-void kmemcheck_mark_initialized(void *address, unsigned int n);
>-void kmemcheck_mark_freed(void *address, unsigned int n);
>-
>-void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n);
>-void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n);
>-void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n);
>-
>-int kmemcheck_show_addr(unsigned long address);
>-int kmemcheck_hide_addr(unsigned long address);
>-
>-bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size);
>-
>-/*
>- * Bitfield annotations
>- *
>- * How to use: If you have a struct using bitfields, for example
>- *
>- * struct a {
>- * int x:8, y:8;
>- * };
>- *
>- * then this should be rewritten as
>- *
>- * struct a {
>- * kmemcheck_bitfield_begin(flags);
>- * int x:8, y:8;
>- * kmemcheck_bitfield_end(flags);
>- * };
>- *
>- * Now the "flags_begin" and "flags_end" members may be used to refer to the
>- * beginning and end, respectively, of the bitfield (and things like
>- * &x.flags_begin is allowed). As soon as the struct is allocated, the bit-
>- * fields should be annotated:
>- *
>- * struct a *a = kmalloc(sizeof(struct a), GFP_KERNEL);
>- * kmemcheck_annotate_bitfield(a, flags);
>- */
>-#define kmemcheck_bitfield_begin(name) \
>- int name##_begin[0];
>-
>-#define kmemcheck_bitfield_end(name) \
>- int name##_end[0];
>-
>-#define kmemcheck_annotate_bitfield(ptr, name) \
>- do { \
>- int _n; \
>- \
>- if (!ptr) \
>- break; \
>- \
>- _n = (long) &((ptr)->name##_end) \
>- - (long) &((ptr)->name##_begin); \
>- BUILD_BUG_ON(_n < 0); \
>- \
>- kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
>- } while (0)
>-
>-#define kmemcheck_annotate_variable(var) \
>- do { \
>- kmemcheck_mark_initialized(&(var), sizeof(var)); \
>- } while (0) \
>-
>-#else
>-#define kmemcheck_enabled 0
>-
>-static inline void
>-kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
>-{
>-}
>-
>-static inline void
>-kmemcheck_free_shadow(struct page *page, int order)
>-{
>-}
>-
>-static inline void
>-kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
>- size_t size)
>-{
>-}
>-
>-static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object,
>- size_t size)
>-{
>-}
>-
>-static inline void kmemcheck_pagealloc_alloc(struct page *p,
>- unsigned int order, gfp_t gfpflags)
>-{
>-}
>-
>-static inline bool kmemcheck_page_is_tracked(struct page *p)
>-{
>- return false;
>-}
>-
>-static inline void kmemcheck_mark_unallocated(void *address, unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_uninitialized(void *address, unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_freed(void *address, unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_unallocated_pages(struct page *p,
>- unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_uninitialized_pages(struct page *p,
>- unsigned int n)
>-{
>-}
>-
>-static inline void kmemcheck_mark_initialized_pages(struct page *p,
>- unsigned int n)
>-{
>-}
>-
>-static inline bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size)
>-{
>- return true;
>-}
>-
>-#define kmemcheck_bitfield_begin(name)
>-#define kmemcheck_bitfield_end(name)
>-#define kmemcheck_annotate_bitfield(ptr, name) \
>- do { \
>- } while (0)
>-
>-#define kmemcheck_annotate_variable(var) \
>- do { \
>- } while (0)
>-
>-#endif /* CONFIG_KMEMCHECK */
>-
>-#endif /* LINUX_KMEMCHECK_H */
>diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
>index 46f4ecf5479a..804d0e754ab0 100644
>--- a/include/linux/mm_types.h
>+++ b/include/linux/mm_types.h
>@@ -206,14 +206,6 @@ struct page {
> not kmapped, ie. highmem) */
> #endif /* WANT_PAGE_VIRTUAL */
>
>-#ifdef CONFIG_KMEMCHECK
>- /*
>- * kmemcheck wants to track the status of each byte in a page; this
>- * is a pointer to such a status block. NULL if not tracked.
>- */
>- void *shadow;
>-#endif
>-
> #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
> int _last_cpupid;
> #endif
>diff --git a/include/linux/net.h b/include/linux/net.h
>index d97d80d7fdf8..caeb159abda5 100644
>--- a/include/linux/net.h
>+++ b/include/linux/net.h
>@@ -22,7 +22,6 @@
> #include <linux/random.h>
> #include <linux/wait.h>
> #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
>-#include <linux/kmemcheck.h>
> #include <linux/rcupdate.h>
> #include <linux/once.h>
> #include <linux/fs.h>
>@@ -111,9 +110,7 @@ struct socket_wq {
> struct socket {
> socket_state state;
>
>- kmemcheck_bitfield_begin(type);
> short type;
>- kmemcheck_bitfield_end(type);
>
> unsigned long flags;
>
>diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
>index ee9b461af095..8c0c6d236c49 100644
>--- a/include/linux/ring_buffer.h
>+++ b/include/linux/ring_buffer.h
>@@ -1,7 +1,6 @@
> #ifndef _LINUX_RING_BUFFER_H
> #define _LINUX_RING_BUFFER_H
>
>-#include <linux/kmemcheck.h>
> #include <linux/mm.h>
> #include <linux/seq_file.h>
> #include <linux/poll.h>
>@@ -13,9 +12,7 @@ struct ring_buffer_iter;
> * Don't refer to this struct directly, use functions below.
> */
> struct ring_buffer_event {
>- kmemcheck_bitfield_begin(bitfield);
> u32 type_len:5, time_delta:27;
>- kmemcheck_bitfield_end(bitfield);
>
> u32 array[];
> };
>diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>index 72299ef00061..ac4041af7f37 100644
>--- a/include/linux/skbuff.h
>+++ b/include/linux/skbuff.h
>@@ -15,7 +15,6 @@
> #define _LINUX_SKBUFF_H
>
> #include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
> #include <linux/compiler.h>
> #include <linux/time.h>
> #include <linux/bug.h>
>@@ -704,7 +703,6 @@ struct sk_buff {
> /* Following fields are _not_ copied in __copy_skb_header()
> * Note that queue_mapping is here mostly to fill a hole.
> */
>- kmemcheck_bitfield_begin(flags1);
> __u16 queue_mapping;
>
> /* if you move cloned around you also must adapt those constants */
>@@ -723,7 +721,6 @@ struct sk_buff {
> head_frag:1,
> xmit_more:1,
> __unused:1; /* one bit hole */
>- kmemcheck_bitfield_end(flags1);
>
> /* fields enclosed in headers_start/headers_end are copied
> * using a single memcpy() in __copy_skb_header()
>diff --git a/include/linux/slab.h b/include/linux/slab.h
>index 41473df6dfb0..f35c640687a0 100644
>--- a/include/linux/slab.h
>+++ b/include/linux/slab.h
>@@ -77,12 +77,6 @@
>
> #define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
>
>-/* Don't track use of uninitialized memory */
>-#ifdef CONFIG_KMEMCHECK
>-# define SLAB_NOTRACK 0x01000000UL
>-#else
>-# define SLAB_NOTRACK 0x00000000UL
>-#endif
> #ifdef CONFIG_FAILSLAB
> # define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
> #else
>diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
>index 905d769d8ddc..c1deb611b5bb 100644
>--- a/include/linux/thread_info.h
>+++ b/include/linux/thread_info.h
>@@ -43,10 +43,9 @@ enum {
> #endif
>
> #ifdef CONFIG_DEBUG_STACK_USAGE
>-# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
>- __GFP_ZERO)
>+# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
> #else
>-# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
>+# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT)
> #endif
>
> /*
>diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
>index aa95053dfc78..21c3e4d73b88 100644
>--- a/include/net/inet_sock.h
>+++ b/include/net/inet_sock.h
>@@ -17,7 +17,6 @@
> #define _INET_SOCK_H
>
> #include <linux/bitops.h>
>-#include <linux/kmemcheck.h>
> #include <linux/string.h>
> #include <linux/types.h>
> #include <linux/jhash.h>
>@@ -84,7 +83,6 @@ struct inet_request_sock {
> #define ireq_state req.__req_common.skc_state
> #define ireq_family req.__req_common.skc_family
>
>- kmemcheck_bitfield_begin(flags);
> u16 snd_wscale : 4,
> rcv_wscale : 4,
> tstamp_ok : 1,
>@@ -93,7 +91,6 @@ struct inet_request_sock {
> ecn_ok : 1,
> acked : 1,
> no_srccheck: 1;
>- kmemcheck_bitfield_end(flags);
> u32 ir_mark;
> union {
> struct ip_options_rcu *opt;
>diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
>index 6a75d67a30fd..48977ba510d6 100644
>--- a/include/net/inet_timewait_sock.h
>+++ b/include/net/inet_timewait_sock.h
>@@ -16,7 +16,6 @@
> #define _INET_TIMEWAIT_SOCK_
>
>
>-#include <linux/kmemcheck.h>
> #include <linux/list.h>
> #include <linux/timer.h>
> #include <linux/types.h>
>@@ -69,14 +68,12 @@ struct inet_timewait_sock {
> /* Socket demultiplex comparisons on incoming packets. */
> /* these three are in inet_sock */
> __be16 tw_sport;
>- kmemcheck_bitfield_begin(flags);
> /* And these are ours. */
> unsigned int tw_kill : 1,
> tw_transparent : 1,
> tw_flowlabel : 20,
> tw_pad : 2, /* 2 bits hole */
> tw_tos : 8;
>- kmemcheck_bitfield_end(flags);
> struct timer_list tw_timer;
> struct inet_bind_bucket *tw_tb;
> };
>diff --git a/include/net/sock.h b/include/net/sock.h
>index a6b9a8d1a6df..167c687ebdb1 100644
>--- a/include/net/sock.h
>+++ b/include/net/sock.h
>@@ -436,7 +436,6 @@ struct sock {
> #define SK_FL_TYPE_MASK 0xffff0000
> #endif
>
>- kmemcheck_bitfield_begin(flags);
> unsigned int sk_padding : 1,
> sk_kern_sock : 1,
> sk_no_check_tx : 1,
>@@ -445,7 +444,6 @@ struct sock {
> sk_protocol : 8,
> sk_type : 16;
> #define SK_PROTOCOL_MAX U8_MAX
>- kmemcheck_bitfield_end(flags);
>
> u16 sk_gso_max_segs;
> unsigned long sk_lingertime;
>diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
>index fec6291a6703..937d5d54d1b9 100644
>--- a/include/trace/events/mmflags.h
>+++ b/include/trace/events/mmflags.h
>@@ -45,7 +45,6 @@
> {(unsigned long)__GFP_RECLAIMABLE, "__GFP_RECLAIMABLE"}, \
> {(unsigned long)__GFP_MOVABLE, "__GFP_MOVABLE"}, \
> {(unsigned long)__GFP_ACCOUNT, "__GFP_ACCOUNT"}, \
>- {(unsigned long)__GFP_NOTRACK, "__GFP_NOTRACK"}, \
> {(unsigned long)__GFP_WRITE, "__GFP_WRITE"}, \
> {(unsigned long)__GFP_RECLAIM, "__GFP_RECLAIM"}, \
> {(unsigned long)__GFP_DIRECT_RECLAIM, "__GFP_DIRECT_RECLAIM"},\
>diff --git a/init/do_mounts.c b/init/do_mounts.c
>index f6d4dd764a52..7cf4f6dafd5f 100644
>--- a/init/do_mounts.c
>+++ b/init/do_mounts.c
>@@ -380,8 +380,7 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
>
> void __init mount_block_root(char *name, int flags)
> {
>- struct page *page = alloc_page(GFP_KERNEL |
>- __GFP_NOTRACK_FALSE_POSITIVE);
>+ struct page *page = alloc_page(GFP_KERNEL);
> char *fs_names = page_address(page);
> char *p;
> #ifdef CONFIG_BLOCK
>diff --git a/init/main.c b/init/main.c
>index 0ee9c6866ada..0e4d39c2ec82 100644
>--- a/init/main.c
>+++ b/init/main.c
>@@ -69,7 +69,6 @@
> #include <linux/kgdb.h>
> #include <linux/ftrace.h>
> #include <linux/async.h>
>-#include <linux/kmemcheck.h>
> #include <linux/sfi.h>
> #include <linux/shmem_fs.h>
> #include <linux/slab.h>
>diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
>index 917cc04a0a94..29af29befbd1 100644
>--- a/kernel/bpf/core.c
>+++ b/kernel/bpf/core.c
>@@ -85,8 +85,6 @@ struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags)
> if (fp == NULL)
> return NULL;
>
>- kmemcheck_annotate_bitfield(fp, meta);
>-
> aux = kzalloc(sizeof(*aux), GFP_KERNEL | gfp_extra_flags);
> if (aux == NULL) {
> vfree(fp);
>@@ -127,8 +125,6 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
> if (fp == NULL) {
> __bpf_prog_uncharge(fp_old->aux->user, delta);
> } else {
>- kmemcheck_annotate_bitfield(fp, meta);
>-
> memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE);
> fp->pages = pages;
> fp->aux->prog = fp;
>@@ -662,8 +658,6 @@ static struct bpf_prog *bpf_prog_clone_create(struct bpf_prog *fp_other,
>
> fp = __vmalloc(fp_other->pages * PAGE_SIZE, gfp_flags, PAGE_KERNEL);
> if (fp != NULL) {
>- kmemcheck_annotate_bitfield(fp, meta);
>-
> /* aux->prog still points to the fp_other one, so
> * when promoting the clone to the real program,
> * this still needs to be adapted.
>diff --git a/kernel/fork.c b/kernel/fork.c
>index 10646182440f..07fdb44af7b8 100644
>--- a/kernel/fork.c
>+++ b/kernel/fork.c
>@@ -465,7 +465,7 @@ void __init fork_init(void)
> /* create a slab on which task_structs can be allocated */
> task_struct_cachep = kmem_cache_create("task_struct",
> arch_task_struct_size, align,
>- SLAB_PANIC|SLAB_NOTRACK|SLAB_ACCOUNT, NULL);
>+ SLAB_PANIC|SLAB_ACCOUNT, NULL);
> #endif
>
> /* do the arch specific task caches init */
>@@ -2187,18 +2187,18 @@ void __init proc_caches_init(void)
> sighand_cachep = kmem_cache_create("sighand_cache",
> sizeof(struct sighand_struct), 0,
> SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_TYPESAFE_BY_RCU|
>- SLAB_NOTRACK|SLAB_ACCOUNT, sighand_ctor);
>+ SLAB_ACCOUNT, sighand_ctor);
> signal_cachep = kmem_cache_create("signal_cache",
> sizeof(struct signal_struct), 0,
>- SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK|SLAB_ACCOUNT,
>+ SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
> NULL);
> files_cachep = kmem_cache_create("files_cache",
> sizeof(struct files_struct), 0,
>- SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK|SLAB_ACCOUNT,
>+ SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
> NULL);
> fs_cachep = kmem_cache_create("fs_cache",
> sizeof(struct fs_struct), 0,
>- SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK|SLAB_ACCOUNT,
>+ SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
> NULL);
> /*
> * FIXME! The "sizeof(struct mm_struct)" currently includes the
>@@ -2209,7 +2209,7 @@ void __init proc_caches_init(void)
> */
> mm_cachep = kmem_cache_create("mm_struct",
> sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
>- SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK|SLAB_ACCOUNT,
>+ SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
> NULL);
> vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT);
> mmap_init();
>diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
>index 44c8d0d17170..a616140f3a2a 100644
>--- a/kernel/locking/lockdep.c
>+++ b/kernel/locking/lockdep.c
>@@ -47,7 +47,6 @@
> #include <linux/stringify.h>
> #include <linux/bitops.h>
> #include <linux/gfp.h>
>-#include <linux/kmemcheck.h>
> #include <linux/random.h>
> #include <linux/jhash.h>
>
>@@ -3233,8 +3232,6 @@ static void __lockdep_init_map(struct lockdep_map *lock, const char *name,
> {
> int i;
>
>- kmemcheck_mark_initialized(lock, sizeof(*lock));
>-
> for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
> lock->class_cache[i] = NULL;
>
>diff --git a/kernel/signal.c b/kernel/signal.c
>index 800a18f77732..8da9a7ff52fc 100644
>--- a/kernel/signal.c
>+++ b/kernel/signal.c
>@@ -1036,8 +1036,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
> else
> override_rlimit = 0;
>
>- q = __sigqueue_alloc(sig, t, GFP_ATOMIC | __GFP_NOTRACK_FALSE_POSITIVE,
>- override_rlimit);
>+ q = __sigqueue_alloc(sig, t, GFP_ATOMIC, override_rlimit);
> if (q) {
> list_add_tail(&q->list, &pending->list);
> switch ((unsigned long) info) {
>diff --git a/kernel/softirq.c b/kernel/softirq.c
>index 4e09821f9d9e..e89c3b0cff6d 100644
>--- a/kernel/softirq.c
>+++ b/kernel/softirq.c
>@@ -486,16 +486,6 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
> }
> EXPORT_SYMBOL(__tasklet_hi_schedule);
>
>-void __tasklet_hi_schedule_first(struct tasklet_struct *t)
>-{
>- BUG_ON(!irqs_disabled());
>-
>- t->next = __this_cpu_read(tasklet_hi_vec.head);
>- __this_cpu_write(tasklet_hi_vec.head, t);
>- __raise_softirq_irqoff(HI_SOFTIRQ);
>-}
>-EXPORT_SYMBOL(__tasklet_hi_schedule_first);
>-
> static __latent_entropy void tasklet_action(struct softirq_action *a)
> {
> struct tasklet_struct *list;
>diff --git a/kernel/sysctl.c b/kernel/sysctl.c
>index 6648fbbb8157..9a9691a76d61 100644
>--- a/kernel/sysctl.c
>+++ b/kernel/sysctl.c
>@@ -30,7 +30,6 @@
> #include <linux/proc_fs.h>
> #include <linux/security.h>
> #include <linux/ctype.h>
>-#include <linux/kmemcheck.h>
> #include <linux/kmemleak.h>
> #include <linux/fs.h>
> #include <linux/init.h>
>@@ -1177,15 +1176,6 @@ static struct ctl_table kern_table[] = {
> .extra2 = &one_thousand,
> },
> #endif
>-#ifdef CONFIG_KMEMCHECK
>- {
>- .procname = "kmemcheck",
>- .data = &kmemcheck_enabled,
>- .maxlen = sizeof(int),
>- .mode = 0644,
>- .proc_handler = proc_dointvec,
>- },
>-#endif
> {
> .procname = "panic_on_warn",
> .data = &panic_on_warn,
>diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
>index 81279c6602ff..7e97e75afc6a 100644
>--- a/kernel/trace/ring_buffer.c
>+++ b/kernel/trace/ring_buffer.c
>@@ -13,7 +13,6 @@
> #include <linux/uaccess.h>
> #include <linux/hardirq.h>
> #include <linux/kthread.h> /* for self test */
>-#include <linux/kmemcheck.h>
> #include <linux/module.h>
> #include <linux/percpu.h>
> #include <linux/mutex.h>
>@@ -2055,7 +2054,6 @@ rb_reset_tail(struct ring_buffer_per_cpu *cpu_buffer,
> }
>
> event = __rb_page_index(tail_page, tail);
>- kmemcheck_annotate_bitfield(event, bitfield);
>
> /* account for padding bytes */
> local_add(BUF_PAGE_SIZE - tail, &cpu_buffer->entries_bytes);
>@@ -2686,7 +2684,6 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
> /* We reserved something on the buffer */
>
> event = __rb_page_index(tail_page, tail);
>- kmemcheck_annotate_bitfield(event, bitfield);
> rb_update_event(cpu_buffer, event, info);
>
> local_inc(&tail_page->entries);
>diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
>index 2689b7c50c52..d4051fcafa4e 100644
>--- a/lib/Kconfig.debug
>+++ b/lib/Kconfig.debug
>@@ -504,7 +504,7 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
>
> config DEBUG_SLAB
> bool "Debug slab memory allocations"
>- depends on DEBUG_KERNEL && SLAB && !KMEMCHECK
>+ depends on DEBUG_KERNEL && SLAB
> help
> Say Y here to have the kernel do limited verification on memory
> allocation as well as poisoning memory on free to catch use of freed
>@@ -516,7 +516,7 @@ config DEBUG_SLAB_LEAK
>
> config SLUB_DEBUG_ON
> bool "SLUB debugging on by default"
>- depends on SLUB && SLUB_DEBUG && !KMEMCHECK
>+ depends on SLUB && SLUB_DEBUG
> default n
> help
> Boot with debugging on by default. SLUB boots by default with
>@@ -730,8 +730,6 @@ config DEBUG_STACKOVERFLOW
>
> If in doubt, say "N".
>
>-source "lib/Kconfig.kmemcheck"
>-
> source "lib/Kconfig.kasan"
>
> endmenu # "Memory Debugging"
>diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck
>deleted file mode 100644
>index 846e039a86b4..000000000000
>--- a/lib/Kconfig.kmemcheck
>+++ /dev/null
>@@ -1,94 +0,0 @@
>-config HAVE_ARCH_KMEMCHECK
>- bool
>-
>-if HAVE_ARCH_KMEMCHECK
>-
>-menuconfig KMEMCHECK
>- bool "kmemcheck: trap use of uninitialized memory"
>- depends on DEBUG_KERNEL
>- depends on !X86_USE_3DNOW
>- depends on SLUB || SLAB
>- depends on !CC_OPTIMIZE_FOR_SIZE
>- depends on !FUNCTION_TRACER
>- select FRAME_POINTER
>- select STACKTRACE
>- default n
>- help
>- This option enables tracing of dynamically allocated kernel memory
>- to see if memory is used before it has been given an initial value.
>- Be aware that this requires half of your memory for bookkeeping and
>- will insert extra code at *every* read and write to tracked memory
>- thus slow down the kernel code (but user code is unaffected).
>-
>- The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable
>- or enable kmemcheck at boot-time. If the kernel is started with
>- kmemcheck=0, the large memory and CPU overhead is not incurred.
>-
>-choice
>- prompt "kmemcheck: default mode at boot"
>- depends on KMEMCHECK
>- default KMEMCHECK_ONESHOT_BY_DEFAULT
>- help
>- This option controls the default behaviour of kmemcheck when the
>- kernel boots and no kmemcheck= parameter is given.
>-
>-config KMEMCHECK_DISABLED_BY_DEFAULT
>- bool "disabled"
>- depends on KMEMCHECK
>-
>-config KMEMCHECK_ENABLED_BY_DEFAULT
>- bool "enabled"
>- depends on KMEMCHECK
>-
>-config KMEMCHECK_ONESHOT_BY_DEFAULT
>- bool "one-shot"
>- depends on KMEMCHECK
>- help
>- In one-shot mode, only the first error detected is reported before
>- kmemcheck is disabled.
>-
>-endchoice
>-
>-config KMEMCHECK_QUEUE_SIZE
>- int "kmemcheck: error queue size"
>- depends on KMEMCHECK
>- default 64
>- help
>- Select the maximum number of errors to store in the queue. Since
>- errors can occur virtually anywhere and in any context, we need a
>- temporary storage area which is guarantueed not to generate any
>- other faults. The queue will be emptied as soon as a tasklet may
>- be scheduled. If the queue is full, new error reports will be
>- lost.
>-
>-config KMEMCHECK_SHADOW_COPY_SHIFT
>- int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)"
>- depends on KMEMCHECK
>- range 2 8
>- default 5
>- help
>- Select the number of shadow bytes to save along with each entry of
>- the queue. These bytes indicate what parts of an allocation are
>- initialized, uninitialized, etc. and will be displayed when an
>- error is detected to help the debugging of a particular problem.
>-
>-config KMEMCHECK_PARTIAL_OK
>- bool "kmemcheck: allow partially uninitialized memory"
>- depends on KMEMCHECK
>- default y
>- help
>- This option works around certain GCC optimizations that produce
>- 32-bit reads from 16-bit variables where the upper 16 bits are
>- thrown away afterwards. This may of course also hide some real
>- bugs.
>-
>-config KMEMCHECK_BITOPS_OK
>- bool "kmemcheck: allow bit-field manipulation"
>- depends on KMEMCHECK
>- default n
>- help
>- This option silences warnings that would be generated for bit-field
>- accesses where not all the bits are initialized at the same time.
>- This may also hide some real bugs.
>-
>-endif
>diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
>index 5b0adf1435de..e5e606ee5f71 100644
>--- a/mm/Kconfig.debug
>+++ b/mm/Kconfig.debug
>@@ -11,7 +11,6 @@ config DEBUG_PAGEALLOC
> bool "Debug page memory allocations"
> depends on DEBUG_KERNEL
> depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>- depends on !KMEMCHECK
> select PAGE_EXTENSION
> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
> ---help---
>diff --git a/mm/Makefile b/mm/Makefile
>index e3ac3aeb533b..cdec8105457c 100644
>--- a/mm/Makefile
>+++ b/mm/Makefile
>@@ -16,7 +16,6 @@ KCOV_INSTRUMENT_slub.o := n
> KCOV_INSTRUMENT_page_alloc.o := n
> KCOV_INSTRUMENT_debug-pagealloc.o := n
> KCOV_INSTRUMENT_kmemleak.o := n
>-KCOV_INSTRUMENT_kmemcheck.o := n
> KCOV_INSTRUMENT_memcontrol.o := n
> KCOV_INSTRUMENT_mmzone.o := n
> KCOV_INSTRUMENT_vmstat.o := n
>@@ -69,7 +68,6 @@ obj-$(CONFIG_KSM) += ksm.o
> obj-$(CONFIG_PAGE_POISONING) += page_poison.o
> obj-$(CONFIG_SLAB) += slab.o
> obj-$(CONFIG_SLUB) += slub.o
>-obj-$(CONFIG_KMEMCHECK) += kmemcheck.o
> obj-$(CONFIG_KASAN) += kasan/
> obj-$(CONFIG_FAILSLAB) += failslab.o
> obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
>diff --git a/mm/kmemcheck.c b/mm/kmemcheck.c
>deleted file mode 100644
>index 2d5959c5f7c5..000000000000
>--- a/mm/kmemcheck.c
>+++ /dev/null
>@@ -1,125 +0,0 @@
>-#include <linux/gfp.h>
>-#include <linux/mm_types.h>
>-#include <linux/mm.h>
>-#include <linux/slab.h>
>-#include "slab.h"
>-#include <linux/kmemcheck.h>
>-
>-void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
>-{
>- struct page *shadow;
>- int pages;
>- int i;
>-
>- pages = 1 << order;
>-
>- /*
>- * With kmemcheck enabled, we need to allocate a memory area for the
>- * shadow bits as well.
>- */
>- shadow = alloc_pages_node(node, flags | __GFP_NOTRACK, order);
>- if (!shadow) {
>- if (printk_ratelimit())
>- pr_err("kmemcheck: failed to allocate shadow bitmap\n");
>- return;
>- }
>-
>- for(i = 0; i < pages; ++i)
>- page[i].shadow = page_address(&shadow[i]);
>-
>- /*
>- * Mark it as non-present for the MMU so that our accesses to
>- * this memory will trigger a page fault and let us analyze
>- * the memory accesses.
>- */
>- kmemcheck_hide_pages(page, pages);
>-}
>-
>-void kmemcheck_free_shadow(struct page *page, int order)
>-{
>- struct page *shadow;
>- int pages;
>- int i;
>-
>- if (!kmemcheck_page_is_tracked(page))
>- return;
>-
>- pages = 1 << order;
>-
>- kmemcheck_show_pages(page, pages);
>-
>- shadow = virt_to_page(page[0].shadow);
>-
>- for(i = 0; i < pages; ++i)
>- page[i].shadow = NULL;
>-
>- __free_pages(shadow, order);
>-}
>-
>-void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
>- size_t size)
>-{
>- if (unlikely(!object)) /* Skip object if allocation failed */
>- return;
>-
>- /*
>- * Has already been memset(), which initializes the shadow for us
>- * as well.
>- */
>- if (gfpflags & __GFP_ZERO)
>- return;
>-
>- /* No need to initialize the shadow of a non-tracked slab. */
>- if (s->flags & SLAB_NOTRACK)
>- return;
>-
>- if (!kmemcheck_enabled || gfpflags & __GFP_NOTRACK) {
>- /*
>- * Allow notracked objects to be allocated from
>- * tracked caches. Note however that these objects
>- * will still get page faults on access, they just
>- * won't ever be flagged as uninitialized. If page
>- * faults are not acceptable, the slab cache itself
>- * should be marked NOTRACK.
>- */
>- kmemcheck_mark_initialized(object, size);
>- } else if (!s->ctor) {
>- /*
>- * New objects should be marked uninitialized before
>- * they're returned to the called.
>- */
>- kmemcheck_mark_uninitialized(object, size);
>- }
>-}
>-
>-void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size)
>-{
>- /* TODO: RCU freeing is unsupported for now; hide false positives. */
>- if (!s->ctor && !(s->flags & SLAB_TYPESAFE_BY_RCU))
>- kmemcheck_mark_freed(object, size);
>-}
>-
>-void kmemcheck_pagealloc_alloc(struct page *page, unsigned int order,
>- gfp_t gfpflags)
>-{
>- int pages;
>-
>- if (gfpflags & (__GFP_HIGHMEM | __GFP_NOTRACK))
>- return;
>-
>- pages = 1 << order;
>-
>- /*
>- * NOTE: We choose to track GFP_ZERO pages too; in fact, they
>- * can become uninitialized by copying uninitialized memory
>- * into them.
>- */
>-
>- /* XXX: Can use zone->node for node? */
>- kmemcheck_alloc_shadow(page, order, gfpflags, -1);
>-
>- if (gfpflags & __GFP_ZERO)
>- kmemcheck_mark_initialized_pages(page, pages);
>- else
>- kmemcheck_mark_uninitialized_pages(page, pages);
>-}
>diff --git a/mm/kmemleak.c b/mm/kmemleak.c
>index 7780cd83a495..a74d878f06c3 100644
>--- a/mm/kmemleak.c
>+++ b/mm/kmemleak.c
>@@ -110,7 +110,6 @@
> #include <linux/atomic.h>
>
> #include <linux/kasan.h>
>-#include <linux/kmemcheck.h>
> #include <linux/kmemleak.h>
> #include <linux/memory_hotplug.h>
>
>@@ -1238,9 +1237,6 @@ static bool update_checksum(struct kmemleak_object *object)
> {
> u32 old_csum = object->checksum;
>
>- if (!kmemcheck_is_obj_initialized(object->pointer, object->size))
>- return false;
>-
> kasan_disable_current();
> object->checksum = crc32(0, (void *)object->pointer, object->size);
> kasan_enable_current();
>@@ -1314,11 +1310,6 @@ static void scan_block(void *_start, void *_end,
> if (scan_should_stop())
> break;
>
>- /* don't scan uninitialized memory */
>- if (!kmemcheck_is_obj_initialized((unsigned long)ptr,
>- BYTES_PER_POINTER))
>- continue;
>-
> kasan_disable_current();
> pointer = *ptr;
> kasan_enable_current();
>diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>index c841af88836a..606c398d409f 100644
>--- a/mm/page_alloc.c
>+++ b/mm/page_alloc.c
>@@ -24,7 +24,6 @@
> #include <linux/memblock.h>
> #include <linux/compiler.h>
> #include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
> #include <linux/kasan.h>
> #include <linux/module.h>
> #include <linux/suspend.h>
>@@ -1013,7 +1012,6 @@ static __always_inline bool free_pages_prepare(struct page *page,
> VM_BUG_ON_PAGE(PageTail(page), page);
>
> trace_mm_page_free(page, order);
>- kmemcheck_free_shadow(page, order);
>
> /*
> * Check tail pages before head page information is cleared to
>@@ -2669,15 +2667,6 @@ void split_page(struct page *page, unsigned int order)
> VM_BUG_ON_PAGE(PageCompound(page), page);
> VM_BUG_ON_PAGE(!page_count(page), page);
>
>-#ifdef CONFIG_KMEMCHECK
>- /*
>- * Split shadow pages too, because free(page[0]) would
>- * otherwise free the whole shadow.
>- */
>- if (kmemcheck_page_is_tracked(page))
>- split_page(virt_to_page(page[0].shadow), order);
>-#endif
>-
> for (i = 1; i < (1 << order); i++)
> set_page_refcounted(page + i);
> split_page_owner(page, order);
>@@ -4223,9 +4212,6 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
> page = NULL;
> }
>
>- if (kmemcheck_enabled && page)
>- kmemcheck_pagealloc_alloc(page, order, gfp_mask);
>-
> trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype);
>
> return page;
>diff --git a/mm/slab.c b/mm/slab.c
>index 04dec48c3ed7..5f91bd387e2e 100644
>--- a/mm/slab.c
>+++ b/mm/slab.c
>@@ -113,7 +113,6 @@
> #include <linux/rtmutex.h>
> #include <linux/reciprocal_div.h>
> #include <linux/debugobjects.h>
>-#include <linux/kmemcheck.h>
> #include <linux/memory.h>
> #include <linux/prefetch.h>
> #include <linux/sched/task_stack.h>
>@@ -1412,7 +1411,7 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
> if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
> flags |= __GFP_RECLAIMABLE;
>
>- page = __alloc_pages_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
>+ page = __alloc_pages_node(nodeid, flags, cachep->gfporder);
> if (!page) {
> slab_out_of_memory(cachep, flags, nodeid);
> return NULL;
>@@ -1434,15 +1433,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
> if (sk_memalloc_socks() && page_is_pfmemalloc(page))
> SetPageSlabPfmemalloc(page);
>
>- if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) {
>- kmemcheck_alloc_shadow(page, cachep->gfporder, flags, nodeid);
>-
>- if (cachep->ctor)
>- kmemcheck_mark_uninitialized_pages(page, nr_pages);
>- else
>- kmemcheck_mark_unallocated_pages(page, nr_pages);
>- }
>-
> return page;
> }
>
>@@ -1454,8 +1444,6 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
> int order = cachep->gfporder;
> unsigned long nr_freed = (1 << order);
>
>- kmemcheck_free_shadow(page, order);
>-
> if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
> mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, -nr_freed);
> else
>@@ -3515,8 +3503,6 @@ void ___cache_free(struct kmem_cache *cachep, void *objp,
> kmemleak_free_recursive(objp, cachep->flags);
> objp = cache_free_debugcheck(cachep, objp, caller);
>
>- kmemcheck_slab_free(cachep, objp, cachep->object_size);
>-
> /*
> * Skip calling cache_free_alien() when the platform is not numa.
> * This will avoid cache misses that happen while accessing slabp (which
>diff --git a/mm/slab.h b/mm/slab.h
>index 073362816acc..8ff05e5b592a 100644
>--- a/mm/slab.h
>+++ b/mm/slab.h
>@@ -39,7 +39,6 @@ struct kmem_cache {
>
> #include <linux/memcontrol.h>
> #include <linux/fault-inject.h>
>-#include <linux/kmemcheck.h>
> #include <linux/kasan.h>
> #include <linux/kmemleak.h>
> #include <linux/random.h>
>@@ -141,10 +140,10 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
> #if defined(CONFIG_SLAB)
> #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
> SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
>- SLAB_NOTRACK | SLAB_ACCOUNT)
>+ SLAB_ACCOUNT)
> #elif defined(CONFIG_SLUB)
> #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
>- SLAB_TEMPORARY | SLAB_NOTRACK | SLAB_ACCOUNT)
>+ SLAB_TEMPORARY | SLAB_ACCOUNT)
> #else
> #define SLAB_CACHE_FLAGS (0)
> #endif
>@@ -163,7 +162,6 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
> SLAB_NOLEAKTRACE | \
> SLAB_RECLAIM_ACCOUNT | \
> SLAB_TEMPORARY | \
>- SLAB_NOTRACK | \
> SLAB_ACCOUNT)
>
> int __kmem_cache_shutdown(struct kmem_cache *);
>@@ -438,7 +436,6 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
> for (i = 0; i < size; i++) {
> void *object = p[i];
>
>- kmemcheck_slab_alloc(s, flags, object, slab_ksize(s));
> kmemleak_alloc_recursive(object, s->object_size, 1,
> s->flags, flags);
> kasan_slab_alloc(s, object, flags);
>diff --git a/mm/slab_common.c b/mm/slab_common.c
>index 904a83be82de..a79c202eedca 100644
>--- a/mm/slab_common.c
>+++ b/mm/slab_common.c
>@@ -43,7 +43,7 @@ static DECLARE_WORK(slab_caches_to_rcu_destroy_work,
> SLAB_FAILSLAB | SLAB_KASAN)
>
> #define SLAB_MERGE_SAME (SLAB_RECLAIM_ACCOUNT | SLAB_CACHE_DMA | \
>- SLAB_NOTRACK | SLAB_ACCOUNT)
>+ SLAB_ACCOUNT)
>
> /*
> * Merge control. If this is set then no merging of slab caches will occur.
>diff --git a/mm/slub.c b/mm/slub.c
>index 163352c537ab..acaffdb0050e 100644
>--- a/mm/slub.c
>+++ b/mm/slub.c
>@@ -21,7 +21,6 @@
> #include <linux/notifier.h>
> #include <linux/seq_file.h>
> #include <linux/kasan.h>
>-#include <linux/kmemcheck.h>
> #include <linux/cpu.h>
> #include <linux/cpuset.h>
> #include <linux/mempolicy.h>
>@@ -1369,12 +1368,11 @@ static inline void *slab_free_hook(struct kmem_cache *s, void *x)
> * So in order to make the debug calls that expect irqs to be
> * disabled we need to disable interrupts temporarily.
> */
>-#if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP)
>+#if defined(CONFIG_LOCKDEP)
> {
> unsigned long flags;
>
> local_irq_save(flags);
>- kmemcheck_slab_free(s, x, s->object_size);
> debug_check_no_locks_freed(x, s->object_size);
> local_irq_restore(flags);
> }
>@@ -1398,8 +1396,7 @@ static inline void slab_free_freelist_hook(struct kmem_cache *s,
> * Compiler cannot detect this function can be removed if slab_free_hook()
> * evaluates to nothing. Thus, catch all relevant config debug options here.
> */
>-#if defined(CONFIG_KMEMCHECK) || \
>- defined(CONFIG_LOCKDEP) || \
>+#if defined(CONFIG_LOCKDEP) || \
> defined(CONFIG_DEBUG_KMEMLEAK) || \
> defined(CONFIG_DEBUG_OBJECTS_FREE) || \
> defined(CONFIG_KASAN)
>@@ -1435,8 +1432,6 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
> struct page *page;
> int order = oo_order(oo);
>
>- flags |= __GFP_NOTRACK;
>-
> if (node == NUMA_NO_NODE)
> page = alloc_pages(flags, order);
> else
>@@ -1595,22 +1590,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
> stat(s, ORDER_FALLBACK);
> }
>
>- if (kmemcheck_enabled &&
>- !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
>- int pages = 1 << oo_order(oo);
>-
>- kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node);
>-
>- /*
>- * Objects from caches that have a constructor don't get
>- * cleared when they're allocated, so we need to do it here.
>- */
>- if (s->ctor)
>- kmemcheck_mark_uninitialized_pages(page, pages);
>- else
>- kmemcheck_mark_unallocated_pages(page, pages);
>- }
>-
> page->objects = oo_objects(oo);
>
> order = compound_order(page);
>@@ -1686,8 +1665,6 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
> check_object(s, page, p, SLUB_RED_INACTIVE);
> }
>
>- kmemcheck_free_shadow(page, compound_order(page));
>-
> mod_lruvec_page_state(page,
> (s->flags & SLAB_RECLAIM_ACCOUNT) ?
> NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
>@@ -3791,7 +3768,7 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
> struct page *page;
> void *ptr = NULL;
>
>- flags |= __GFP_COMP | __GFP_NOTRACK;
>+ flags |= __GFP_COMP;
> page = alloc_pages_node(node, flags, get_order(size));
> if (page)
> ptr = page_address(page);
>@@ -5654,8 +5631,6 @@ static char *create_unique_id(struct kmem_cache *s)
> *p++ = 'a';
> if (s->flags & SLAB_CONSISTENCY_CHECKS)
> *p++ = 'F';
>- if (!(s->flags & SLAB_NOTRACK))
>- *p++ = 't';
> if (s->flags & SLAB_ACCOUNT)
> *p++ = 'A';
> if (p != name + 1)
>diff --git a/net/core/skbuff.c b/net/core/skbuff.c
>index 16982de649b9..382d6155cd2e 100644
>--- a/net/core/skbuff.c
>+++ b/net/core/skbuff.c
>@@ -41,7 +41,6 @@
> #include <linux/module.h>
> #include <linux/types.h>
> #include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
> #include <linux/mm.h>
> #include <linux/interrupt.h>
> #include <linux/in.h>
>@@ -234,14 +233,12 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
> shinfo = skb_shinfo(skb);
> memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
> atomic_set(&shinfo->dataref, 1);
>- kmemcheck_annotate_variable(shinfo->destructor_arg);
>
> if (flags & SKB_ALLOC_FCLONE) {
> struct sk_buff_fclones *fclones;
>
> fclones = container_of(skb, struct sk_buff_fclones, skb1);
>
>- kmemcheck_annotate_bitfield(&fclones->skb2, flags1);
> skb->fclone = SKB_FCLONE_ORIG;
> refcount_set(&fclones->fclone_ref, 1);
>
>@@ -301,7 +298,6 @@ struct sk_buff *__build_skb(void *data, unsigned int frag_size)
> shinfo = skb_shinfo(skb);
> memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
> atomic_set(&shinfo->dataref, 1);
>- kmemcheck_annotate_variable(shinfo->destructor_arg);
>
> return skb;
> }
>@@ -1279,7 +1275,6 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
> if (!n)
> return NULL;
>
>- kmemcheck_annotate_bitfield(n, flags1);
> n->fclone = SKB_FCLONE_UNAVAILABLE;
> }
>
>diff --git a/net/core/sock.c b/net/core/sock.c
>index 9b7b6bbb2a23..f358370b4a2e 100644
>--- a/net/core/sock.c
>+++ b/net/core/sock.c
>@@ -1469,8 +1469,6 @@ static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
> sk = kmalloc(prot->obj_size, priority);
>
> if (sk != NULL) {
>- kmemcheck_annotate_bitfield(sk, flags);
>-
> if (security_sk_alloc(sk, family, priority))
> goto out_free;
>
>diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
>index 5b039159e67a..d451b9f19b59 100644
>--- a/net/ipv4/inet_timewait_sock.c
>+++ b/net/ipv4/inet_timewait_sock.c
>@@ -9,7 +9,6 @@
> */
>
> #include <linux/kernel.h>
>-#include <linux/kmemcheck.h>
> #include <linux/slab.h>
> #include <linux/module.h>
> #include <net/inet_hashtables.h>
>@@ -167,8 +166,6 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
> if (tw) {
> const struct inet_sock *inet = inet_sk(sk);
>
>- kmemcheck_annotate_bitfield(tw, flags);
>-
> tw->tw_dr = dr;
> /* Give us an identity. */
> tw->tw_daddr = inet->inet_daddr;
>diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
>index c5d7656beeee..4d2e31273a25 100644
>--- a/net/ipv4/tcp_input.c
>+++ b/net/ipv4/tcp_input.c
>@@ -6195,7 +6195,6 @@ struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
> if (req) {
> struct inet_request_sock *ireq = inet_rsk(req);
>
>- kmemcheck_annotate_bitfield(ireq, flags);
> ireq->opt = NULL;
> #if IS_ENABLED(CONFIG_IPV6)
> ireq->pktopts = NULL;
>diff --git a/net/socket.c b/net/socket.c
>index c729625eb5d3..42d8e9c9ccd5 100644
>--- a/net/socket.c
>+++ b/net/socket.c
>@@ -568,7 +568,6 @@ struct socket *sock_alloc(void)
>
> sock = SOCKET_I(inode);
>
>- kmemcheck_annotate_bitfield(sock, type);
> inode->i_ino = get_next_ino();
> inode->i_mode = S_IFSOCK | S_IRWXUGO;
> inode->i_uid = current_fsuid();
>diff --git a/scripts/kernel-doc b/scripts/kernel-doc
>index 9d3eafea58f0..8323ff9dec71 100755
>--- a/scripts/kernel-doc
>+++ b/scripts/kernel-doc
>@@ -2182,8 +2182,6 @@ sub dump_struct($$) {
> # strip comments:
> $members =~ s/\/\*.*?\*\///gos;
> $nested =~ s/\/\*.*?\*\///gos;
>- # strip kmemcheck_bitfield_{begin,end}.*;
>- $members =~ s/kmemcheck_bitfield_.*?;//gos;
> # strip attributes
> $members =~ s/__attribute__\s*$\([a-z,_\*\s\($]*\)\)//i;
> $members =~ s/__aligned\s*$[^;]*$//gos;
>diff --git a/tools/include/linux/kmemcheck.h b/tools/include/linux/kmemcheck.h
>deleted file mode 100644
>index 94d598bc6abe..000000000000
>--- a/tools/include/linux/kmemcheck.h
>+++ /dev/null
>@@ -1,8 +0,0 @@
>-#ifndef _LIBLOCKDEP_LINUX_KMEMCHECK_H_
>-#define _LIBLOCKDEP_LINUX_KMEMCHECK_H_
>-
>-static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
>-{
>-}
>-
>-#endif
>diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
>index 24ee68ecdd42..988c4732fe5d 100644
>--- a/tools/perf/builtin-kmem.c
>+++ b/tools/perf/builtin-kmem.c
>@@ -654,7 +654,6 @@ static const struct {
> { "__GFP_RECLAIMABLE", "RC" },
> { "__GFP_MOVABLE", "M" },
> { "__GFP_ACCOUNT", "AC" },
>- { "__GFP_NOTRACK", "NT" },
> { "__GFP_WRITE", "WR" },
> { "__GFP_RECLAIM", "R" },
> { "__GFP_DIRECT_RECLAIM", "DR" },
>--
>2.11.0

--

Thanks,
Sasha

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