linux-kernel - Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

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Date:	Wed, 6 Dec 2006 19:08:28 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Christoph Lameter <clameter@....com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...l.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

On Wed, Dec 06, 2006 at 11:05:22AM -0800, Linus Torvalds wrote:
> 
> 
> On Wed, 6 Dec 2006, Christoph Lameter wrote:
> >
> > I'd really appreciate a cmpxchg that is generically available for 
> > all arches. It will allow lockless implementation for various performance 
> > criticial portions of the kernel.
> 
> I suspect ARM may have been the last one without one, no?

No.  sparc32 doesn't have one, for instance.
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