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

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Message-ID: <20061208153250.GB31068@flint.arm.linux.org.uk>
Date:	Fri, 8 Dec 2006 15:32:50 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>,
	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 Thu, Dec 07, 2006 at 03:06:06PM +0000, Russell King wrote:
> 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.
> 
> Things seem to have moved on since this request.  Do I need to do
> anything?  I dunno.

ARM's still broken.

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