Messages in this thread Patch in this message | | | From | Mark Rutland <> | Subject | [PATCHv2 02/11] atomics/x86: reduce arch_cmpxchg64*() instrumentation | Date | Mon, 25 Jun 2018 11:59:43 +0100 |
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Currently x86's arch_cmpxchg64() and arch_cmpxchg64_local() are instrumented twice, as they call into instrumented atomics rather than their arch_ equivalents.
A call to cmpxchg64() results in:
cmpxchg64() kasan_check_write() arch_cmpxchg64() cmpxchg() kasan_check_write() arch_cmpxchg()
Let's fix this up and call the arch_ equivalents, resulting in:
cmpxchg64() kasan_check_write() arch_cmpxchg64() arch_cmpxchg()
Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> --- arch/x86/include/asm/cmpxchg_64.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/cmpxchg_64.h b/arch/x86/include/asm/cmpxchg_64.h index bfca3b346c74..072e5459fe2f 100644 --- a/arch/x86/include/asm/cmpxchg_64.h +++ b/arch/x86/include/asm/cmpxchg_64.h @@ -10,13 +10,13 @@ static inline void set_64bit(volatile u64 *ptr, u64 val) #define arch_cmpxchg64(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ - cmpxchg((ptr), (o), (n)); \ + arch_cmpxchg((ptr), (o), (n)); \ }) #define arch_cmpxchg64_local(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ - cmpxchg_local((ptr), (o), (n)); \ + arch_cmpxchg_local((ptr), (o), (n)); \ }) #define system_has_cmpxchg_double() boot_cpu_has(X86_FEATURE_CX16) -- 2.11.0
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