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

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Message-ID: <20070815234146.GB28775@gondor.apana.org.au>
Date:	Thu, 16 Aug 2007 07:41:46 +0800
From:	Herbert Xu <herbert.xu@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	David Howells <dhowells@...hat.com>,
	Satyam Sharma <satyam@...radead.org>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Christoph Lameter <clameter@....com>,
	Chris Snook <csnook@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	netdev@...r.kernel.org, Andrew Morton <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,
	segher@...nel.crashing.org
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

On Wed, Aug 15, 2007 at 11:45:20AM -0700, Paul E. McKenney wrote:
> On Wed, Aug 15, 2007 at 07:19:57PM +0100, David Howells wrote:
> > Herbert Xu <herbert@...dor.apana.org.au> wrote:
> > 
> > > Let's turn this around.  Can you give a single example where
> > > the volatile semantics is needed in a legitimate way?
> > 
> > Accessing H/W registers?  But apart from that...
> 
> Communicating between process context and interrupt/NMI handlers using
> per-CPU variables.

Remeber we're talking about atomic_read/atomic_set.  Please
cite the actual file/function name you have in mind.

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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