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

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Message-ID: <46C2D6F3.3070707@s5r6.in-berlin.de>
Date:	Wed, 15 Aug 2007 12:35:31 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Satyam Sharma <satyam@...radead.org>
CC:	Christoph Lameter <clameter@....com>,
	Chris Snook <csnook@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, 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,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all
 architectures

Satyam Sharma wrote:
> [ BTW, why do we want the compiler to not optimize atomic_read()'s in
>   the first place? Atomic ops guarantee atomicity, which has nothing
>   to do with "volatility" -- users that expect "volatility" from
>   atomic ops are the ones who must be fixed instead, IMHO. ]

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?
-- 
Stefan Richter
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http://arcgraph.de/sr/
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