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

Russell King
2006-12-08T15:33:00Z

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/