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

Russell King
2006-12-06T20:00:30Z

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/