Messages in this thread | | | Date | Thu, 1 Oct 2015 19:13:04 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants |
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On Thu, Oct 01, 2015 at 08:09:09AM -0700, Paul E. McKenney wrote: > On Thu, Oct 01, 2015 at 02:24:40PM +0200, Peter Zijlstra wrote:
> > I must say I'm somewhat surprised by this level of relaxation, I had > > expected to only loose SMP barriers, not the program order ones. > > > > Is there a good argument for this? > > Yes, when we say "relaxed", we really mean relaxed. ;-) > > Both the CPU and the compiler are allowed to reorder around relaxed > operations.
Is this documented somewhere, because I completely missed this part.
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