Date: Wed, 15 Aug 2007 12:59:01 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
cc: Satyam Sharma <satyam@infradead.org>, Chris Snook <csnook@redhat.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-arch@vger.kernel.org, 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, Herbert Xu <herbert@gondor.apana.org.au>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all
 architectures
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On Wed, 15 Aug 2007, Stefan Richter wrote:

> LDD3 says on page 125:  "The following operations are defined for the
> type [atomic_t] and are guaranteed to be atomic with respect to all
> processors of an SMP computer."
> 
> Doesn't "atomic WRT all processors" require volatility?

Atomic operations only require exclusive access to the cacheline while the 
value is modified.


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