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

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Message-ID: <20061206200019.GB15281@flint.arm.linux.org.uk>
Date:	Wed, 6 Dec 2006 20:00:19 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Christoph Lameter <clameter@....com>,
	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?
> 
> That said, cmpxchg won't necessarily be "high-performance" unless the hw 
> supports it naturally in hardware, so..
> 
> Russell, are you ok with the code DavidH posted (the "try 2" one)? I'd 
> like to get an ack from the ARM maintainer before applying it, but it 
> looked ok.

I've only recently got in today, so it'll be a while (== tomorrow) before
I can get around to doing any tests.  (It's evening this side of the
pond.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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