[PATCH v3 4/5] arm64: barrier: Support waiting in smp_cond_load_relaxed_timewait()

[Ankur Arora <ankur.a.arora@oracle.com>]

Define __smp_timewait_store() to support waiting for a condition
variable via __cmpwait_relaxed().

Used from smp_cond_load_{relaxed,acquire}_timewait().

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoph Lameter (Ampere) <cl@gentwo.org>
Reviewed-by: Haris Okanovic <harisokn@amazon.com>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 arch/arm64/include/asm/barrier.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 1ca947d5c939..7c56e2621c7d 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -216,6 +216,12 @@ do {									\
 	(typeof(*ptr))VAL;						\
 })
 
+/*
+ * Support waiting in smp_cond_load_{relaxed,acquire}_timewait().
+ */
+#define __smp_timewait_store(ptr, val)					\
+		__cmpwait_relaxed(ptr, val)
+
 #include <asm-generic/barrier.h>
 
 #endif	/* __ASSEMBLY__ */
-- 
2.43.5