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

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Message-ID: <20061208164733.GE31068@flint.arm.linux.org.uk>
Date:	Fri, 8 Dec 2006 16:47:33 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Christoph Lameter <clameter@....com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	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

On Fri, Dec 08, 2006 at 08:43:09AM -0800, Christoph Lameter wrote:
> On Fri, 8 Dec 2006, Russell King wrote:
> 
> > You're advocating cmpxchg is adopted by all architectures.  It isn't
> > available on many architectures, and those which it can be requires
> > unnecessarily complicated coding.
> 
> Not having cmpxchg is even worse because it requires the introduction and 
> maintenance of large sets of arch specific operations. Much more complex.

And which bit of "not available on many architectures" have you not grasped
yet?

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