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Diffstat (limited to 'arch/arm64/include/asm/barrier.h')
-rw-r--r--arch/arm64/include/asm/barrier.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index dae5c49618db..4eea7f618dce 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -91,6 +91,19 @@ do { \
__u.__val; \
})
+#define smp_cond_load_acquire(ptr, cond_expr) \
+({ \
+ typeof(ptr) __PTR = (ptr); \
+ typeof(*ptr) VAL; \
+ for (;;) { \
+ VAL = smp_load_acquire(__PTR); \
+ if (cond_expr) \
+ break; \
+ __cmpwait_relaxed(__PTR, VAL); \
+ } \
+ VAL; \
+})
+
#include <asm-generic/barrier.h>
#endif /* __ASSEMBLY__ */