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authorMichael S. Tsirkin <mst@redhat.com>2015-12-27 15:04:42 +0200
committerMichael S. Tsirkin <mst@redhat.com>2016-01-12 20:46:57 +0200
commit90a3ccb0be538a914e6a5c51ae919762261563ad (patch)
treecdf5acfa14f0ea661640646572181d1250c7572d /arch/sh
parent82b44496abd91781ed4120c3b0c1a3d111c3e28e (diff)
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')
-rw-r--r--arch/sh/include/asm/barrier.h3
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>