linux-kernel - Re: [PATCH] make atomic_t volatile on all architectures

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Message-Id: <20070808.184824.133910636.davem@davemloft.net>
Date:	Wed, 08 Aug 2007 18:48:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	csnook@...hat.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, ak@...e.de,
	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, schwidefsky@...ibm.com,
	wensong@...ux-vs.org, horms@...ge.net.au, wjiang@...ilience.com,
	cfriesen@...tel.com, zlynx@....org
Subject: Re: [PATCH] make atomic_t volatile on all architectures

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 09 Aug 2007 09:03:27 +0800

> Such loops should always use something like cpu_relax() which comes
> with a barrier.

This is an excellent point.

And it needs to be weighed with the error prone'ness Andrew mentioned.
There probably is a middle ground somewhere.
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