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

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Message-ID: <Pine.LNX.4.64.0612080841560.15472@schroedinger.engr.sgi.com>
Date:	Fri, 8 Dec 2006 08:43:09 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Russell King <rmk+lkml@....linux.org.uk>
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, 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.


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