On Wed, Apr 27, 2016 at 10:50:34PM +0800, Boqun Feng wrote: > > Sorry, my bad, we can't implement cmpxchg like this.. please ignore > this, I should really go to bed soon... > > But still, we can save the "tmp" for xchg() I think. > No.. we can't. Sorry for all the noise. This patch looks good to me. FWIW, you can add Acked-by: Boqun Feng Regards, Boqun