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

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Message-ID: <20140207165028.GO4250@linux.vnet.ibm.com>
Date:	Fri, 7 Feb 2014 08:50:28 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Torvald Riegel <triegel@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
	David Howells <dhowells@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

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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