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Message-ID: <20070815235335.GU9645@linux.vnet.ibm.com>
Date: Wed, 15 Aug 2007 16:53:35 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Herbert Xu <herbert.xu@...hat.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 Thu, Aug 16, 2007 at 07:41:46AM +0800, Herbert Xu wrote:
> 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.
Yep, we are indeed talking about atomic_read()/atomic_set().
We have been through this issue already in this thread.
Thanx, Paul
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