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authorLuck, Tony <tony.luck@intel.com>2013-09-03 14:49:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-03 15:36:42 -0700
commitd472d9d98b463dd7a04f2bcdeafe4261686ce6ab (patch)
tree05972418a7e71d3e8d5a9c8c8d5e1dc22f013c5b /lib/lockref.c
parent2f01ea908bcf838e815c0124b579513dbda3b8c8 (diff)
downloadop-kernel-dev-d472d9d98b463dd7a04f2bcdeafe4261686ce6ab.zip
op-kernel-dev-d472d9d98b463dd7a04f2bcdeafe4261686ce6ab.tar.gz
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 7819c2d..9d76f40 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)
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