On Wed, Mar 22, 2017 at 1:57 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > Two problems was reported with READ_ONCE_NOCHECK in arch_atomic_read: > 1. Andrey Ryabinin reported significant binary size increase > (+400K of text). READ_ONCE_NOCHECK is intentionally compiled to > non-inlined function call, and I counted 640 copies of it in my vmlinux. > 2. Arnd Bergmann reported a new splat of too large frame sizes. > > A single inlined KASAN check is very cheap, a non-inlined function > call with KASAN/KCOV instrumentation can easily be more expensive. > > Switch to READ_ONCE() in arch_atomic[64]_read(). > > Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Reported-by: Arnd Bergmann <arnd@xxxxxxxx> > Reported-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> > Cc: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Will Deacon <will.deacon@xxxxxxx> > Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: linux-mm@xxxxxxxxx > Cc: x86@xxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: kasan-dev@xxxxxxxxxxxxxxxx > Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Acked-by: Arnd Bergmann <arnd@xxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
