Re: [RFC][PATCH 0/5] arch: atomic rework

From: Paul E. McKenney
Date: Fri Feb 07 2014 - 11:50:53 EST

On Fri, Feb 07, 2014 at 08:44:05AM +0100, Peter Zijlstra wrote:
> On Thu, Feb 06, 2014 at 08:20:51PM -0800, Paul E. McKenney wrote:
> > Hopefully some discussion of out-of-thin-air values as well.
> Yes, absolutely shoot store speculation in the head already. Then drive
> a wooden stake through its hart.
> C11/C++11 should not be allowed to claim itself a memory model until that
> is sorted.

There actually is a proposal being put forward, but it might not make ARM
and Power people happy because it involves adding a compare, a branch,
and an ISB/isync after every relaxed load... Me, I agree with you,
much preferring the no-store-speculation approach.

Thanx, Paul

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