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Subject[GIT PULL kcsan] KCSAN commits for v5.17
Hello, Ingo,

This pull request contains updates for the Kernel concurrency sanitizer
(KCSAN). Perhaps the most notable addition is added support for weak
memory ordering, as described here: https://lwn.net/Articles/877200/

These updats have been posted on LKML:

https://lore.kernel.org/all/20211214220356.GA2236323@paulmck-ThinkPad-P17-Gen-1/

These changes are based on v5.16-rc1, have been exposed to -next and to
kbuild test robot, and are available in the Git repository at:

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

for you to fetch changes up to b473a3891c46393e9c4ccb4e3197d7fb259c7100:

kcsan: Only test clear_bit_unlock_is_negative_byte if arch defines it (2021-12-09 16:42:29 -0800)

If I don't hear from you by Friday of the week prior to the merge window
opening, I will assume that you would prefer that I push this directly
to Linus.

Have a great holiday season!

----------------------------------------------------------------
Alexander Potapenko (1):
compiler_attributes.h: Add __disable_sanitizer_instrumentation

Marco Elver (28):
kcsan: Refactor reading of instrumented memory
kcsan: Remove redundant zero-initialization of globals
kcsan: Avoid checking scoped accesses from nested contexts
kcsan: Add core support for a subset of weak memory modeling
kcsan: Add core memory barrier instrumentation functions
kcsan, kbuild: Add option for barrier instrumentation only
kcsan: Call scoped accesses reordered in reports
kcsan: Show location access was reordered to
kcsan: Document modeling of weak memory
kcsan: test: Match reordered or normal accesses
kcsan: test: Add test cases for memory barrier instrumentation
kcsan: Ignore GCC 11+ warnings about TSan runtime support
kcsan: selftest: Add test case to check memory barrier instrumentation
locking/barriers, kcsan: Add instrumentation for barriers
locking/barriers, kcsan: Support generic instrumentation
locking/atomics, kcsan: Add instrumentation for barriers
asm-generic/bitops, kcsan: Add instrumentation for barriers
x86/barriers, kcsan: Use generic instrumentation for non-smp barriers
x86/qspinlock, kcsan: Instrument barrier of pv_queued_spin_unlock()
mm, kcsan: Enable barrier instrumentation
sched, kcsan: Enable memory barrier instrumentation
objtool, kcsan: Add memory barrier instrumentation to whitelist
objtool, kcsan: Remove memory barrier instrumentation from noinstr
kcsan: Support WEAK_MEMORY with Clang where no objtool support exists
kcsan: Make barrier tests compatible with lockdep
kcsan: Turn barrier instrumentation into macros
kcsan: Avoid nested contexts reading inconsistent reorder_access
kcsan: Only test clear_bit_unlock_is_negative_byte if arch defines it

Documentation/dev-tools/kcsan.rst | 76 +++-
arch/x86/include/asm/barrier.h | 10 +-
arch/x86/include/asm/qspinlock.h | 1 +
include/asm-generic/barrier.h | 54 ++-
include/asm-generic/bitops/instrumented-atomic.h | 3 +
include/asm-generic/bitops/instrumented-lock.h | 3 +
include/linux/atomic/atomic-instrumented.h | 135 ++++++-
include/linux/compiler_attributes.h | 18 +
include/linux/compiler_types.h | 13 +-
include/linux/kcsan-checks.h | 83 ++++-
include/linux/kcsan.h | 11 +-
include/linux/sched.h | 3 +
include/linux/spinlock.h | 2 +-
init/init_task.c | 5 -
kernel/kcsan/Makefile | 2 +
kernel/kcsan/core.c | 347 +++++++++++++++---
kernel/kcsan/kcsan_test.c | 426 +++++++++++++++++++++--
kernel/kcsan/report.c | 51 +--
kernel/kcsan/selftest.c | 143 ++++++++
kernel/sched/Makefile | 7 +-
lib/Kconfig.kcsan | 20 ++
mm/Makefile | 2 +
scripts/Makefile.kcsan | 15 +-
scripts/Makefile.lib | 5 +
scripts/atomic/gen-atomic-instrumented.sh | 41 ++-
tools/objtool/check.c | 41 ++-
tools/objtool/include/objtool/elf.h | 2 +-
27 files changed, 1347 insertions(+), 172 deletions(-)

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