linux-kernel - Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

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Message-ID: <Pine.LNX.4.64.0708141529310.32693@schroedinger.engr.sgi.com>
Date:	Tue, 14 Aug 2007 15:31:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Chris Snook <csnook@...hat.com>
cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	torvalds@...ux-foundation.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org, ak@...e.de, heiko.carstens@...ibm.com,
	davem@...emloft.net, schwidefsky@...ibm.com, wensong@...ux-vs.org,
	horms@...ge.net.au, wjiang@...ilience.com, cfriesen@...tel.com,
	zlynx@....org, rpjday@...dspring.com, jesper.juhl@...il.com
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all
 architectures

On Thu, 9 Aug 2007, Chris Snook wrote:

> This patchset makes the behavior of atomic_read uniform by removing the
> volatile keyword from all atomic_t and atomic64_t definitions that currently
> have it, and instead explicitly casts the variable as volatile in
> atomic_read().  This leaves little room for creative optimization by the
> compiler, and is in keeping with the principles behind "volatile considered
> harmful".

volatile is generally harmful even in atomic_read(). Barriers control
visibility and AFAICT things are fine.
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