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authorJens Axboe <jens.axboe@oracle.com>2009-12-03 15:49:39 +0300
committerJens Axboe <jens.axboe@oracle.com>2009-12-03 15:49:39 +0300
commit220d0b1dbf78c6417a658c96e571415552d3abac (patch)
tree70cd3862540c38ea490e7a27c3c7acc35b680234 /arch/sparc/include/asm
parent474b18ccc264c472abeec50f48469b6477202699 (diff)
parent22763c5cf3690a681551162c15d34d935308c8d7 (diff)
downloadlinux-220d0b1dbf78c6417a658c96e571415552d3abac.tar.xz
Merge branch 'master' into for-2.6.33
Diffstat (limited to 'arch/sparc/include/asm')
-rw-r--r--arch/sparc/include/asm/system_64.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/system_64.h b/arch/sparc/include/asm/system_64.h
index 25e848f0cad7..d47a98e66972 100644
--- a/arch/sparc/include/asm/system_64.h
+++ b/arch/sparc/include/asm/system_64.h
@@ -63,6 +63,10 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
: : : "memory"); \
} while (0)
+/* The kernel always executes in TSO memory model these days,
+ * and furthermore most sparc64 chips implement more stringent
+ * memory ordering than required by the specifications.
+ */
#define mb() membar_safe("#StoreLoad")
#define rmb() __asm__ __volatile__("":::"memory")
#define wmb() __asm__ __volatile__("":::"memory")