Commit d472d9d9 authored Sep 03, 2013 by Tony Luck Committed by Linus Torvalds Sep 03, 2013

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>

parent 2f01ea90

lib/lockref.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		if (likely(old.lock_count == prev.lock_count)) { \
		SUCCESS; \
		} \
		cpu_relax(); \
		} \
		} while (0)