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-rw-r--r--tools/arch/x86/include/asm/atomic.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h
index 059e33e94260..328eeceec709 100644
--- a/tools/arch/x86/include/asm/atomic.h
+++ b/tools/arch/x86/include/asm/atomic.h
@@ -7,6 +7,8 @@
#define LOCK_PREFIX "\n\tlock; "
+#include <asm/cmpxchg.h>
+
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
@@ -62,4 +64,9 @@ static inline int atomic_dec_and_test(atomic_t *v)
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 */