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Message-ID: <Pine.LNX.4.64.0708151916310.11706@schroedinger.engr.sgi.com>
Date: Wed, 15 Aug 2007 19:17:10 -0700 (PDT)
From: Christoph Lameter <clameter@....com>
To: Paul Mackerras <paulus@...ba.org>
cc: Herbert Xu <herbert@...dor.apana.org.au>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Satyam Sharma <satyam@...radead.org>,
Stefan Richter <stefanr@...6.in-berlin.de>,
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, 15 Aug 2007, Christoph Lameter wrote:
> On Thu, 16 Aug 2007, Paul Mackerras wrote:
>
> > > We don't need to reload sk->sk_prot->memory_allocated here.
> >
> > Are you sure? How do you know some other CPU hasn't changed the value
> > in between?
>
> The cpu knows because the cacheline was not invalidated.
Crap my statement above is wrong..... We do not care that the
value was changed otherwise we would have put a barrier in there.
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