[GIT PULL tip/core/rcu] RCU commits for v5.10

From: Paul E. McKenney
Date: Mon Sep 14 2020 - 13:46:18 EST

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Hello, Ingo!

This pull request contains the following changes:

1. Documentation updates.

https://lore.kernel.org/lkml/20200831175419.GA31013@paulmck-ThinkPad-P72

2. Miscellaneous fixes.

https://lore.kernel.org/lkml/20200831180050.GA32590@paulmck-ThinkPad-P72

3. Torture-test updates.

https://lore.kernel.org/lkml/20200831180348.GA416@paulmck-ThinkPad-P72

4. New smp_call_function() torture test.

https://lore.kernel.org/lkml/20200831180731.GA582@paulmck-ThinkPad-P72

5. Strict grace periods for KASAN. The point of this series is to find
RCU-usage bugs, so the corresponding new RCU_STRICT_GRACE_PERIOD
Kconfig option depends on both DEBUG_KERNEL and RCU_EXPERT, and is
further disabled by dfefault. Finally, the help text includes
a goodly list of scary caveats.

https://lore.kernel.org/lkml/20200831181101.GA950@paulmck-ThinkPad-P72

6. Debugging for smp_call_function().

https://lore.kernel.org/lkml/20200831181356.GA1224@paulmck-ThinkPad-P72

The fix for the kvfree_rcu() issue noted by Sebastian in response to my
v5.9 pull request is still in the works, as was discussed at the end
of the Real Time Microconference at Linux Plumbers Conference a few
weeks ago. Uladislau has produced early prototype patches following
the plan outlined at that Microconference. Initial testing results
are encouraging, so I hope to be able to include them in my v5.11 pull
request. I had of course hoped to include these fixes in this pull
request, and the reason for the additional delay is that the first N
proposed solutions all had fatal flaws. I nevertheless have high hopes
for the current proposed solution N+1.

In the meantime, all of the commits in this pull request have been
subjected to the kbuild test robot and -next testing, and are available
in the git repository based on 5.9-rc1 at:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo

for you to fetch changes up to 6fe208f63a79f4f726f3be2b78ea3dd40487b657:

Merge branch 'csd.2020.09.04a' into HEAD (2020-09-04 11:54:52 -0700)

----------------------------------------------------------------
Alexander A. Klimov (1):
rcutorture: Replace HTTP links with HTTPS ones

Colin Ian King (1):
refperf: Avoid null pointer dereference when buf fails to allocate

Joel Fernandes (Google) (6):
rcu/trace: Print negative GP numbers correctly
rcu/trace: Use gp_seq_req in acceleration's rcu_grace_period tracepoint
rcu: Clarify comments about FQS loop reporting quiescent states
rcu: Make FQS more aggressive in complaining about offline CPUs
rcutorture: Output number of elapsed grace periods
rcu/segcblist: Prevent useless GP start if no CBs to accelerate

Madhuparna Bhowmik (2):
rculist: Introduce list/hlist_for_each_entry_srcu() macros
kvm: mmu: page_track: Fix RCU list API usage

Neeraj Upadhyay (2):
rcu/tree: Force quiescent state on callback overload
rcu/tree: Remove CONFIG_PREMPT_RCU check in force_qs_rnp()

Paul E. McKenney (60):
lib: Add backtrace_idle parameter to force backtrace of idle CPUs
rcu: Remove KCSAN stubs
rcu: Remove KCSAN stubs from update.c
srcu: Remove KCSAN stubs
rcu: Initialize at declaration time in rcu_exp_handler()
nocb: Clarify RCU nocb CPU error message
nocb: Remove show_rcu_nocb_state() false positive printout
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_divisor
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_resched_ns
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_kick_kthreads
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_cpu_stall_ftrace_dump
rcu: Move rcu_cpu_started per-CPU variable to rcu_data
rcu/nocb: Add a warning for non-GP kthread running GP code
rcu: Remove unused __rcu_is_watching() function
scftorture: Add smp_call_function() torture test
torture: Declare parse-console.sh independence from rcutorture
torture: Add scftorture to the rcutorture scripting
scftorture: Implement weighted primitive selection
tick-sched: Clarify "NOHZ: local_softirq_pending" warning
scftorture: Summarize per-thread statistics
scftorture: Add smp_call_function_single() memory-ordering checks
scftorture: Add smp_call_function_many() memory-ordering checks
scftorture: Add smp_call_function() memory-ordering checks
scftorture: Consolidate scftorture_invoke_one() check and kfree()
scftorture: Consolidate scftorture_invoke_one() scf_check initialization
scftorture: Flag errors in torture-compatible manner
scftorture: Prevent compiler from reducing race probabilities
scftorture: Check unexpected "switch" statement value
scftorture: Block scftorture_invoker() kthreads for offline CPUs
scftorture: Adapt memory-ordering test to UP operation
scftorture: Add cond_resched() to test loop
rcuperf: Change rcuperf to rcuscale
rcu: Add Kconfig option for strict RCU grace periods
rcu: Reduce leaf fanout for strict RCU grace periods
rcu: Restrict default jiffies_till_first_fqs for strict RCU GPs
rcu: Force DEFAULT_RCU_BLIMIT to 1000 for strict RCU GPs
rcu: Always set .need_qs from __rcu_read_lock() for strict GPs
rcu: Do full report for .need_qs for strict GPs
rcu: Attempt QS when CPU discovers GP for strict GPs
rcu: IPI all CPUs at GP start for strict GPs
rcu: IPI all CPUs at GP end for strict GPs
rcu: Provide optional RCU-reader exit delay for strict GPs
rcu: Execute RCU reader shortly after rcu_core for strict GPs
rcu: Report QS for outermost PREEMPT=n rcu_read_unlock() for strict GPs
rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp()
rcutorture: Remove KCSAN stubs
torture: Update initrd documentation
rcutorture: Add CONFIG_PROVE_RCU_LIST to TREE05
torture: Add kvm.sh --help and update help message
rcutorture: Properly set rcu_fwds for OOM handling
rcutorture: Properly synchronize with OOM notifier
rcutorture: Hoist OOM registry up one level
rcutorture: Allow pointer leaks to test diagnostic code
torture: Add gdb support
Merge branches 'doc.2020.08.24a', 'fixes.2020.09.03b' and 'torture.2020.08.24a' into HEAD
Merge branch 'scftorture.2020.08.24a' into HEAD
Merge branch 'strictgp.2020.08.24a' into HEAD
smp: Add source and destination CPUs to __call_single_data
kernel/smp: Provide CSD lock timeout diagnostics
Merge branch 'csd.2020.09.04a' into HEAD

Paul Gortmaker (1):
torture: document --allcpus argument added to the kvm.sh script

Randy Dunlap (2):
doc: Drop doubled words from RCU Data-Structures.rst
doc: Drop doubled words from RCU requirements documentation

Tobias Klauser (2):
docs: Fix typo in synchronize_rcu() function name
rcu: Fix kerneldoc comments in rcupdate.h

Wei Yongjun (3):
scftorture: Make symbol 'scf_torture_rand' static
locktorture: Make function torture_percpu_rwsem_init() static
smp: Make symbol 'csd_bug_count' static

Zqiang (1):
rcu: Shrink each possible cpu krcp

.../RCU/Design/Data-Structures/Data-Structures.rst | 2 +-
.../RCU/Design/Requirements/Requirements.rst | 4 +-
Documentation/RCU/whatisRCU.rst | 2 +-
Documentation/admin-guide/kernel-parameters.txt | 153 +++++-
MAINTAINERS | 3 +-
arch/x86/kvm/mmu/page_track.c | 6 +-
include/linux/rculist.h | 48 ++
include/linux/rcupdate.h | 19 +-
include/linux/rcutiny.h | 1 -
include/linux/rcutree.h | 1 -
include/linux/smp.h | 3 +
include/linux/smp_types.h | 3 +
include/trace/events/rcu.h | 54 +-
kernel/Makefile | 2 +
kernel/entry/common.c | 2 +-
kernel/locking/locktorture.c | 2 +-
kernel/rcu/Kconfig | 8 +-
kernel/rcu/Kconfig.debug | 17 +-
kernel/rcu/Makefile | 2 +-
kernel/rcu/rcu_segcblist.c | 10 +-
kernel/rcu/{rcuperf.c => rcuscale.c} | 330 ++++++------
kernel/rcu/rcutorture.c | 61 ++-
kernel/rcu/refscale.c | 8 +-
kernel/rcu/srcutree.c | 13 -
kernel/rcu/tree.c | 165 ++++--
kernel/rcu/tree.h | 2 +
kernel/rcu/tree_exp.h | 6 +-
kernel/rcu/tree_plugin.h | 40 +-
kernel/rcu/tree_stall.h | 8 +-
kernel/rcu/update.c | 13 -
kernel/scftorture.c | 575 +++++++++++++++++++++
kernel/smp.c | 134 +++++
kernel/time/tick-sched.c | 2 +-
lib/Kconfig.debug | 21 +
lib/nmi_backtrace.c | 6 +-
...rf-ftrace.sh => kvm-recheck-rcuscale-ftrace.sh} | 6 +-
...-recheck-rcuperf.sh => kvm-recheck-rcuscale.sh} | 14 +-
.../selftests/rcutorture/bin/kvm-recheck-scf.sh | 38 ++
.../selftests/rcutorture/bin/kvm-test-1-run.sh | 33 +-
tools/testing/selftests/rcutorture/bin/kvm.sh | 36 +-
.../selftests/rcutorture/bin/parse-console.sh | 11 +-
.../selftests/rcutorture/configs/rcu/TREE05 | 1 +
.../selftests/rcutorture/configs/rcuperf/CFcommon | 2 -
.../configs/{rcuperf => rcuscale}/CFLIST | 0
.../selftests/rcutorture/configs/rcuscale/CFcommon | 2 +
.../rcutorture/configs/{rcuperf => rcuscale}/TINY | 0
.../rcutorture/configs/{rcuperf => rcuscale}/TREE | 0
.../configs/{rcuperf => rcuscale}/TREE54 | 0
.../configs/{rcuperf => rcuscale}/ver_functions.sh | 4 +-
.../selftests/rcutorture/configs/scf/CFLIST | 2 +
.../selftests/rcutorture/configs/scf/CFcommon | 2 +
.../selftests/rcutorture/configs/scf/NOPREEMPT | 9 +
.../rcutorture/configs/scf/NOPREEMPT.boot | 1 +
.../selftests/rcutorture/configs/scf/PREEMPT | 9 +
.../rcutorture/configs/scf/ver_functions.sh | 30 ++
tools/testing/selftests/rcutorture/doc/initrd.txt | 36 +-
.../selftests/rcutorture/doc/rcu-test-image.txt | 41 +-
57 files changed, 1582 insertions(+), 421 deletions(-)
rename kernel/rcu/{rcuperf.c => rcuscale.c} (64%)
create mode 100644 kernel/scftorture.c
rename tools/testing/selftests/rcutorture/bin/{kvm-recheck-rcuperf-ftrace.sh => kvm-recheck-rcuscale-ftrace.sh} (92%)
rename tools/testing/selftests/rcutorture/bin/{kvm-recheck-rcuperf.sh => kvm-recheck-rcuscale.sh} (84%)
create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-recheck-scf.sh
delete mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/CFcommon
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/CFLIST (100%)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcuscale/CFcommon
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TINY (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TREE (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TREE54 (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/ver_functions.sh (88%)
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/CFLIST
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/CFcommon
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/NOPREEMPT
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/NOPREEMPT.boot
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/PREEMPT
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/ver_functions.sh

Next message: Leo Yan: "[PATCH v4 5/6] perf tests tsc: Make tsc testing as a common testing"
Previous message: Vitaly Kuznetsov: "Re: [PATCH -tip] KVM: SVM: nested: Initialize on-stack pointers in svm_set_nested_state()"
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