[GIT PULL] x86/asm changes for 4.1

[Andy Lutomirski]

On Thu, Feb 26, 2015 at 2:40 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> Hi all-
>
> After much handwringing, painful review, and curation, here's round 1 of
> the x86/asm changes.  (This is not intended to imply that there will or
> will not be a round 2.)
>
> For ease of review for git users:
>
> The following changes since commit 7453311d68f16a5c587c3cbf19563c9a4fbbd41a:
>
>   Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (2015-02-09 17:16:44 -0800)
>
> are available in the git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
>
> for you to fetch changes up to 4710be56d76ef994ddf59087aad98c000fbab9a4:
>
>   x86_64, entry: Remove a bogus ret_from_fork optimization (2015-02-26 07:09:36 -0800)

Hi Ingo,

This has held up well in -next for several days, and the code looks
correct to me.  No one has anything interesting to say about the code
lately.  The KERNEL_STACK_OFFSET stuff you objected to isn't in here.

Please consider pulling.  I haven't made a new "pr" tag, since the
code is unchanged from the version I emailed out last week.

Thanks,
Andy

>
> Ingo, if you like these, feel free to pull.  I will try to review the scary
> change *again* this evening if I have time.  In the mean time, these are
> queued as is for -next.  I will remove them from my -next branch if they
> turn out to be buggy or if they end up in -tip in any form.
>
> Andy Lutomirski (2):
>   x86, entry: Remove int_check_syscall_exit_work
>   x86_64, entry: Remove a bogus ret_from_fork optimization
>
> Denys Vlasenko (14):
>   x86: open-code register save/restore in trace_hardirqs thunks
>   x86: introduce push/pop macros which generate CFI_REL_OFFSET and
>     CFI_RESTORE
>   x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET
>   x86: entry_64.S: always allocate complete "struct pt_regs"
>   x86: entry_64.S: fix comments. No code changes
>   x86: code shrink in paranoid_exit
>   x86: mass removal of ARGOFFSET. No code changes
>   x86: add comments about various syscall instructions, no code changes
>   x86: entry_64.S: move save_paranoid and ret_from_fork closer to their
>     users
>   x86: entry_64.S: rename save_paranoid to paranoid_entry, no code
>     changes
>   x86: ia32entry.S: fold IA32_ARG_FIXUP macro into its callers
>   x86: entry_64.S: use more understandable constants
>   x86: ia32entry.S: use more understandable constant
>   x86: entry.S: simplify optimistic SYSRET
>
>  arch/x86/ia32/ia32entry.S              | 342 ++++++++++++----------
>  arch/x86/include/asm/calling.h         | 267 ++++++++---------
>  arch/x86/include/asm/dwarf2.h          |  24 ++
>  arch/x86/include/asm/irqflags.h        |   4 +-
>  arch/x86/include/asm/ptrace.h          |  13 +-
>  arch/x86/include/uapi/asm/ptrace-abi.h |  16 +-
>  arch/x86/include/uapi/asm/ptrace.h     |  13 +-
>  arch/x86/kernel/entry_32.S             |  21 +-
>  arch/x86/kernel/entry_64.S             | 510 ++++++++++++++++-----------------
>  arch/x86/lib/atomic64_cx8_32.S         |  50 ++--
>  arch/x86/lib/checksum_32.S             |  60 ++--
>  arch/x86/lib/msr-reg.S                 |  24 +-
>  arch/x86/lib/rwsem.S                   |  44 ++-
>  arch/x86/lib/thunk_32.S                |  18 +-
>  arch/x86/lib/thunk_64.S                |  28 +-
>  15 files changed, 724 insertions(+), 710 deletions(-)
>
> --
> 2.1.0
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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