Allow architectures to override smp_store_release
and smp_load_acquire by guarding the defines
in asm-generic/barrier.h with ifndef directives.
This is in preparation to reusing asm-generic/barrier.h
on architectures which have their own definition
of these macros.
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Acked-by: Arnd Bergmann <a...@arndb.de>
---
include/asm-generic/barrier.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index 0f45f93..987b2e0 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -104,13 +104,16 @@
#define smp_mb__after_atomic() smp_mb()
#endif
+#ifndef smp_store_release
#define smp_store_release(p, v)
\
do { \
compiletime_assert_atomic_type(*p); \
smp_mb(); \
WRITE_ONCE(*p, v); \
} while (0)
+#endif
+#ifndef smp_load_acquire
#define smp_load_acquire(p) \
({ \
typeof(*p) ___p1 = READ_ONCE(*p); \
@@ -118,6 +121,7 @@ do {
\
smp_mb(); \
___p1; \
})
+#endif
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_GENERIC_BARRIER_H */
--
MST
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