From d472d9d98b463dd7a04f2bcdeafe4261686ce6ab Mon Sep 17 00:00:00 2001 From: "Luck, Tony" Date: Tue, 3 Sep 2013 14:49:49 -0700 Subject: 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 Signed-off-by: Linus Torvalds --- lib/lockref.c | 1 + 1 file changed, 1 insertion(+) 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) -- cgit v1.2.3