linux-kernel - Re: [RFC PATCH 00/15] Provide atomics and bitops implemented with ISO C++11 atomics

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Message-ID: <20160518180558.GI3206@twins.programming.kicks-ass.net>
Date:	Wed, 18 May 2016 20:05:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-arch@...r.kernel.org, x86@...nel.org, will.deacon@....com,
	linux-kernel@...r.kernel.org, ramana.radhakrishnan@....com,
	paulmck@...ux.vnet.ibm.com, dwmw2@...radead.org
Subject: Re: [RFC PATCH 00/15] Provide atomics and bitops implemented with
 ISO C++11 atomics

On Wed, May 18, 2016 at 04:10:37PM +0100, David Howells wrote:
>  (1) We could weaken the kernel memory model to for the benefit of arches
>      that have instructions that employ explicit acquire/release barriers -
>      but that may cause data races to occur based on assumptions we've
>      already made.  Note, however, that powerpc already seems to have a
>      weaker memory model.

Linus always vehemently argues against weakening our memory model.