# \[PATCH v3 02/41\] asm-generic: guard smp\_store\_release/load\_acquire - From: Michael S. Tsirkin \ - Date: 2016-01-10 14:16:56 - List: linux-arm-kernel - Page: https://ratatoskr.run/linux-arm-kernel/2016/01/4656798 - Thread: https://ratatoskr.run/linux-arch/2016/01/4656797/t.md ```text 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 Acked-by: Arnd Bergmann --- 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 ```