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authorLuck, Tony <tony.luck@intel.com>2013-09-04 01:49:49 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-04 02:36:42 +0400
commitd472d9d98b463dd7a04f2bcdeafe4261686ce6ab (patch)
tree05972418a7e71d3e8d5a9c8c8d5e1dc22f013c5b /lib/lockref.c
parent2f01ea908bcf838e815c0124b579513dbda3b8c8 (diff)
downloadlinux-d472d9d98b463dd7a04f2bcdeafe4261686ce6ab.tar.xz
lockref: Relax in cmpxchg loop
While we are likley to succeed and break out of this loop, it isn't guaranteed. We should be power and thread friendly if we do have to go around for a second (or third, or more) attempt. Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/lockref.c')
-rw-r--r--lib/lockref.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/lockref.c b/lib/lockref.c
index 7819c2d1d315..9d76f404ce9a 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -19,6 +19,7 @@
if (likely(old.lock_count == prev.lock_count)) { \
SUCCESS; \
} \
+ cpu_relax(); \
} \
} while (0)