On Mon, Oct 28, 2013 at 10:58:58PM +0200, Victor Kaplansky wrote:

Oleg Nesterov [off-list ref] wrote on 10/28/2013 10:17:35 PM:

quoted

      mb();   // XXXXXXXX: do we really need it? I think yes.

Oh, it is hard to argue with feelings. Also, it is easy to be on
conservative side and put the barrier here just in case.

I'll make it a full mb for now and too am curious to see the end of this
discussion explaining things ;-)