On Fri, Oct 02, 2015 at 07:19:04AM +0800, Boqun Feng wrote: > Hi Peter, > > Please forgive me for the format of my reply. I'm travelling, > and replying from my phone. > > 2015年10月1日 下午7:28，"Peter Zijlstra" <[email protected]>写道： > > > > On Wed, Sep 16, 2015 at 11:49:34PM +0800, Boqun Feng wrote: > > > According to memory-barriers.txt, xchg and its atomic{,64}_ versions > > > need to imply a full barrier, however they are now just RELEASE+ACQUIRE, > > > which is not a full barrier. > > > > > > So remove the definition of xchg(), and let __atomic_op_fence() build > > > the full-barrier versions of these operations. > > > > Do you want to do a patch for -stable fixing the current implementation? > > Good idea! I didn't think of this before, and I'd love to do the patch, > but thing is that I'm not able to use my laptop until Oct 10th. > I will send the patch once I'm back. > Does that work for you?
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