mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
00d5551cc4
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>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: andy.shevchenko@gmail.com
Cc: arnd@arndb.de
Cc: aryabinin@virtuozzo.com
Cc: catalin.marinas@arm.com
Cc: glider@google.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: parri.andrea@gmail.com
Cc: peter@hurleysoftware.com
Link: http://lkml.kernel.org/r/20180716113017.3909-3-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
24 lines
561 B
C
24 lines
561 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_CMPXCHG_64_H
|
|
#define _ASM_X86_CMPXCHG_64_H
|
|
|
|
static inline void set_64bit(volatile u64 *ptr, u64 val)
|
|
{
|
|
*ptr = val;
|
|
}
|
|
|
|
#define arch_cmpxchg64(ptr, o, n) \
|
|
({ \
|
|
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
|
arch_cmpxchg((ptr), (o), (n)); \
|
|
})
|
|
|
|
#define arch_cmpxchg64_local(ptr, o, n) \
|
|
({ \
|
|
BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
|
|
arch_cmpxchg_local((ptr), (o), (n)); \
|
|
})
|
|
|
|
#define system_has_cmpxchg_double() boot_cpu_has(X86_FEATURE_CX16)
|
|
|
|
#endif /* _ASM_X86_CMPXCHG_64_H */
|