tools arch x86: Introduce atomic_cmpxchg()

Will be used by atomic_cmpxchg_relaxed(), in turn used by refcount.h.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-kdmovd3l4gw5b1w31ypr6ddv@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 3337e682
...@@ -7,6 +7,8 @@ ...@@ -7,6 +7,8 @@
#define LOCK_PREFIX "\n\tlock; " #define LOCK_PREFIX "\n\tlock; "
#include <asm/cmpxchg.h>
/* /*
* Atomic operations that C can't guarantee us. Useful for * Atomic operations that C can't guarantee us. Useful for
* resource counting etc.. * resource counting etc..
...@@ -62,4 +64,9 @@ static inline int atomic_dec_and_test(atomic_t *v) ...@@ -62,4 +64,9 @@ static inline int atomic_dec_and_test(atomic_t *v)
GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e"); GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");
} }
static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
return cmpxchg(&v->counter, old, new);
}
#endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */
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