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

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Message-Id: <20061206.170911.45496956.davem@davemloft.net>
Date:	Wed, 06 Dec 2006 17:09:11 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	viro@....linux.org.uk
Cc:	torvalds@...l.org, clameter@....com, rmk+lkml@....linux.org.uk,
	dhowells@...hat.com, akpm@...l.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	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

From: Al Viro <viro@....linux.org.uk>
Date: Wed, 6 Dec 2006 19:08:28 +0000

> 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.

That's correct.  It has an atomic swap, but not a cmpxchg.
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