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

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Message-ID: <20070816003023.GA29447@gondor.apana.org.au>
Date:	Thu, 16 Aug 2007 08:30:23 +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 05:23:10PM -0700, Paul E. McKenney wrote:
> On Thu, Aug 16, 2007 at 08:12:48AM +0800, Herbert Xu wrote:
> > On Wed, Aug 15, 2007 at 04:53:35PM -0700, Paul E. McKenney wrote:
> > >
> > > > > 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.
> > 
> > Sorry, but I must've missed it.  Could you cite the file or
> > function for my benefit?
> 
> I might summarize the thread if there is interest, but I am not able to
> do so right this minute.

Thanks.  But I don't need a summary of the thread, I'm asking
for an extant code snippet in our kernel that benefits from
the volatile change and is not part of a busy-wait.

Cheers,
-- 
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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