summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/atomic.h
diff options
context:
space:
mode:
authorDmitry Vyukov <dvyukov@google.com>2018-01-29 20:26:07 +0300
committerIngo Molnar <mingo@kernel.org>2018-03-12 14:15:35 +0300
commitac605bee0bfab40fd5d11964705e907d2d5a32de (patch)
tree0f16f12d231f572f275e44ed30362bceacca2f7e /arch/x86/include/asm/atomic.h
parenta35353bb9eb1990a44a0d7585f99e9589bcdb682 (diff)
downloadlinux-ac605bee0bfab40fd5d11964705e907d2d5a32de.tar.xz
locking/atomic, asm-generic, x86: Add comments for atomic instrumentation
The comments are factored out from the code changes to make them easier to read. Add them separately to explain some non-obvious aspects. Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/cc595efc644bb905407012d82d3eb8bac3368e7a.1517246437.git.dvyukov@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/atomic.h')
-rw-r--r--arch/x86/include/asm/atomic.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index 33afc966d6a9..0db6bec95489 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -24,6 +24,10 @@
*/
static __always_inline int arch_atomic_read(const atomic_t *v)
{
+ /*
+ * Note for KASAN: we deliberately don't use READ_ONCE_NOCHECK() here,
+ * it's non-inlined function that increases binary size and stack usage.
+ */
return READ_ONCE((v)->counter);
}