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Message-ID: <20191119145618.GA19028@paulmck-ThinkPad-P72>
Date: Tue, 19 Nov 2019 06:56:18 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: mingo@...nel.org
Cc: elver@...gle.com, linux-kernel@...r.kernel.org,
sfr@...b.auug.org.au
Subject: [GIT RFC PULL kcsan] KCSAN commits for 5.5
Hello, Ingo,
This pull request contains base kernel concurrency sanitizer
(KCSAN) enablement for x86, courtesy of Marco Elver. KCSAN is a
sampling watchpoint-based data-race detector, and is documented in
Documentation/dev-tools/kcsan.rst. KCSAN was announced in September,
and much feedback has since been incorporated:
http://lkml.kernel.org/r/CANpmjNPJ_bHjfLZCAPV23AXFfiPiyXXqqu72n6TgWzb2Gnu1eA@mail.gmail.com
The data races located thus far have resulted in a number of fixes:
https://github.com/google/ktsan/wiki/KCSAN#upstream-fixes-of-data-races-found-by-kcsan
Additional information may be found here:
https://lore.kernel.org/lkml/20191114180303.66955-1-elver@google.com/
This has been subject to kbuild test robot and -next testing. The
-next testing located a Kconfig conflict called out here:
https://lore.kernel.org/lkml/20191119183042.5839ef00@canb.auug.org.au/
Marco is satisfied with Stephen's resolution, and it looks good to me
as well.
The following changes since commit 31f4f5b495a62c9a8b15b1c3581acd5efeb9af8c:
Linux 5.4-rc7 (2019-11-10 16:17:15 -0800)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
for you to fetch changes up to 40d04110f87940b6a03bf0aa19cd29e84f465f20:
x86, kcsan: Enable KCSAN for x86 (2019-11-16 07:23:16 -0800)
----------------------------------------------------------------
Marco Elver (9):
kcsan: Add Kernel Concurrency Sanitizer infrastructure
include/linux/compiler.h: Introduce data_race(expr) macro
kcsan: Add Documentation entry in dev-tools
objtool, kcsan: Add KCSAN runtime functions to whitelist
build, kcsan: Add KCSAN build exceptions
seqlock, kcsan: Add annotations for KCSAN
seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier
locking/atomics, kcsan: Add KCSAN instrumentation
x86, kcsan: Enable KCSAN for x86
Documentation/dev-tools/index.rst | 1 +
Documentation/dev-tools/kcsan.rst | 256 ++++++++++++
MAINTAINERS | 11 +
Makefile | 3 +-
arch/x86/Kconfig | 1 +
arch/x86/boot/Makefile | 2 +
arch/x86/boot/compressed/Makefile | 2 +
arch/x86/entry/vdso/Makefile | 3 +
arch/x86/include/asm/bitops.h | 6 +-
arch/x86/kernel/Makefile | 4 +
arch/x86/kernel/cpu/Makefile | 3 +
arch/x86/lib/Makefile | 4 +
arch/x86/mm/Makefile | 4 +
arch/x86/purgatory/Makefile | 2 +
arch/x86/realmode/Makefile | 3 +
arch/x86/realmode/rm/Makefile | 3 +
drivers/firmware/efi/libstub/Makefile | 2 +
include/asm-generic/atomic-instrumented.h | 393 ++++++++++---------
include/linux/compiler-clang.h | 9 +
include/linux/compiler-gcc.h | 7 +
include/linux/compiler.h | 57 ++-
include/linux/kcsan-checks.h | 97 +++++
include/linux/kcsan.h | 115 ++++++
include/linux/sched.h | 4 +
include/linux/seqlock.h | 51 ++-
init/init_task.c | 8 +
init/main.c | 2 +
kernel/Makefile | 6 +
kernel/kcsan/Makefile | 11 +
kernel/kcsan/atomic.h | 27 ++
kernel/kcsan/core.c | 626 ++++++++++++++++++++++++++++++
kernel/kcsan/debugfs.c | 275 +++++++++++++
kernel/kcsan/encoding.h | 94 +++++
kernel/kcsan/kcsan.h | 108 ++++++
kernel/kcsan/report.c | 320 +++++++++++++++
kernel/kcsan/test.c | 121 ++++++
kernel/sched/Makefile | 6 +
lib/Kconfig.debug | 2 +
lib/Kconfig.kcsan | 118 ++++++
lib/Makefile | 3 +
mm/Makefile | 8 +
scripts/Makefile.kcsan | 6 +
scripts/Makefile.lib | 10 +
scripts/atomic/gen-atomic-instrumented.sh | 17 +-
tools/objtool/check.c | 18 +
45 files changed, 2623 insertions(+), 206 deletions(-)
create mode 100644 Documentation/dev-tools/kcsan.rst
create mode 100644 include/linux/kcsan-checks.h
create mode 100644 include/linux/kcsan.h
create mode 100644 kernel/kcsan/Makefile
create mode 100644 kernel/kcsan/atomic.h
create mode 100644 kernel/kcsan/core.c
create mode 100644 kernel/kcsan/debugfs.c
create mode 100644 kernel/kcsan/encoding.h
create mode 100644 kernel/kcsan/kcsan.h
create mode 100644 kernel/kcsan/report.c
create mode 100644 kernel/kcsan/test.c
create mode 100644 lib/Kconfig.kcsan
create mode 100644 scripts/Makefile.kcsan
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