From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <clameter@sgi.com>
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all
 architectures
Date: Wed, 15 Aug 2007 19:15:54 -0700 (PDT)
Message-ID: <Pine.LNX.4.64.0708151915390.11706@schroedinger.engr.sgi.com>
References: <20070809131423.GA9927@shell.boston.redhat.com>
 <Pine.LNX.4.64.0708141529310.32693@schroedinger.engr.sgi.com>
 <alpine.LFD.0.999.0708150417240.6482@enigma.security.iitk.ac.in>
 <46C2D6F3.3070707@s5r6.in-berlin.de> <alpine.LFD.0.999.0708151713080.16414@enigma.security.iitk.ac.in>
 <18115.35524.56393.347841@cargo.ozlabs.ibm.com>
 <Pine.LNX.4.64.0708151725130.10497@schroedinger.engr.sgi.com>
 <20070816003948.GY9645@linux.vnet.ibm.com> <Pine.LNX.4.64.0708151740570.10497@schroedinger.engr.sgi.com>
 <18115.44462.622801.683446@cargo.ozlabs.ibm.com> <20070816020042.GA30650@gondor.apana.org.au>
 <18115.45316.702491.681906@cargo.ozlabs.ibm.com>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Satyam Sharma <satyam@infradead.org>,
	Stefan Richter <stefanr@s5r6.in-berlin.de>,
	Chris Snook <csnook@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arch@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	netdev@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
	ak@suse.de, heiko.carstens@de.ibm.com, davem@davemloft.net,
	schwidefsky@de.ibm.com, wensong@linux-vs.org, horms@verge.net.au,
	wjiang@resilience.com, cfriesen@nortel.com, zlynx@acm.org,
	rpjday@mindspring.com, jesper.juhl@gmail.com,
	segher@kernel.crashing.org
To: Paul Mackerras <paulus@samba.org>
Return-path: <netdev-owner@vger.kernel.org>
Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:54539 "EHLO
	relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org
	with ESMTP id S1759443AbXHPCP5 (ORCPT
	<rfc822;netdev@vger.kernel.org>); Wed, 15 Aug 2007 22:15:57 -0400
In-Reply-To: <18115.45316.702491.681906@cargo.ozlabs.ibm.com>
Sender: netdev-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

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.