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

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Message-ID: <46BB508B.7050601@redhat.com>
Date:	Thu, 09 Aug 2007 13:36:11 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Chris Snook <csnook@...hat.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, ak@...e.de, heiko.carstens@...ibm.com,
	davem@...emloft.net, 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

On 08/09/2007 03:31 AM, Chris Snook wrote:
> 
> Fair enough.  Casting to (volatile int *) will give us the behavior
> people expect when using atomic_t without needing to use inefficient
> barriers.
> 

You can use this forget() macro to make the compiler reread a variable:

#define forget(var) asm volatile ("" : "=m"(var))
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