ARM: 7853/1: cmpxchg: implement cmpxchg64_relaxed

This patch introduces cmpxchg64_relaxed for arm, which performs a 64-bit
cmpxchg operation without barrier semantics. cmpxchg64_local is updated
to use the new operation.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/arm/include/asm/cmpxchg.h b/arch/arm/include/asm/cmpxchg.h
index fbd978fc248f..df2fbba7efc8 100644
--- a/arch/arm/include/asm/cmpxchg.h
+++ b/arch/arm/include/asm/cmpxchg.h
@@ -270,11 +270,13 @@ static inline unsigned long long __cmpxchg64_mb(unsigned long long *ptr,
                                         (unsigned long long)(o),        \
                                         (unsigned long long)(n)))
 
-#define cmpxchg64_local(ptr, o, n)                                      \
+#define cmpxchg64_relaxed(ptr, o, n)                                    \
         ((__typeof__(*(ptr)))__cmpxchg64((ptr),                         \
                                         (unsigned long long)(o),        \
                                         (unsigned long long)(n)))
 
+#define cmpxchg64_local(ptr, o, n)      cmpxchg64_relaxed((ptr), (o), (n))
+
 #endif  /* __LINUX_ARM_ARCH__ >= 6 */
 
 #endif /* __ASM_ARM_CMPXCHG_H */