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lockref: Relax in cmpxchg loop

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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>
This commit is contained in:
Luck, Tony 2013-09-03 14:49:49 -07:00 committed by Linus Torvalds
parent 2f01ea908b
commit d472d9d98b
1 changed files with 1 additions and 0 deletions
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lib/lockref.c
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@ -19,6 +19,7 @@
if (likely(old.lock_count == prev.lock_count)) { \
SUCCESS; \
} \
cpu_relax(); \
} \
} while (0)