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" <pet...@infradead.org>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? Regards, Boqun
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