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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>
hifive-unleashed-5.1
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)