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| author |   Michael S. Tsirkin <mst@redhat.com> | 2015-12-27 15:04:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-12 20:46:57 +0200 |
| commit | 90a3ccb0be538a914e6a5c51ae919762261563ad (patch) | |
| tree | cdf5acfa14f0ea661640646572181d1250c7572d /arch/sh/include/asm/barrier.h | |
| parent | s390: define __smp_xxx (diff) | |
| download | linux-dev-90a3ccb0be538a914e6a5c51ae919762261563ad.tar.xz linux-dev-90a3ccb0be538a914e6a5c51ae919762261563ad.zip | |
sh: define __smp_xxx, fix smp_store_mb for !SMP
sh variant of smp_store_mb() calls xchg() on !SMP which is stronger than
implied by both the name and the documentation.
define __smp_store_mb instead: code in asm-generic/barrier.h
will then define smp_store_mb correctly depending on
CONFIG_SMP.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'arch/sh/include/asm/barrier.h')
| -rw-r--r-- | arch/sh/include/asm/barrier.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/sh/include/asm/barrier.h b/arch/sh/include/asm/barrier.h index bf91037db4e0..f887c6465a82 100644 --- a/arch/sh/include/asm/barrier.h +++ b/arch/sh/include/asm/barrier.h @@ -32,7 +32,8 @@ #define ctrl_barrier() __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop") #endif -#define smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0) +#define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0) +#define smp_store_mb(var, value) __smp_store_mb(var, value) #include <asm-generic/barrier.h> |