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

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Message-ID: <46C3253F.5090707@s5r6.in-berlin.de>
Date:	Wed, 15 Aug 2007 18:09:35 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Satyam Sharma <satyam@...radead.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Chris Snook <csnook@...hat.com>, clameter@....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, 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

Herbert Xu wrote:
> On Wed, Aug 15, 2007 at 08:05:38PM +0530, Satyam Sharma wrote:
>>> I don't know if this here is affected:

[...something like]
	b = atomic_read(a);
	for (i = 0; i < 4; i++) {
		msleep_interruptible(63);
		c = atomic_read(a);
		if (c != b) {
			b = c;
			i = 0;
		}
	}

> Nope, we're calling schedule which is a rather heavy-weight
> barrier.

How does the compiler know that msleep() has got barrier()s?
-- 
Stefan Richter
-=====-=-=== =--- -====
http://arcgraph.de/sr/
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