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

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Message-ID: <Pine.LNX.4.64.0612070203520.1867@scrub.home>
Date:	Thu, 7 Dec 2006 02:05:24 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...l.org>
cc:	Matthew Wilcox <matthew@....cx>,
	Christoph Lameter <clameter@....com>,
	David Howells <dhowells@...hat.com>, 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

Hi,

On Wed, 6 Dec 2006, Linus Torvalds wrote:

> > > To be honest, it'd be much easier if we only defined these operations on
> > > atomic_t's.  We have all the infrastructure in place for them, and
> > > they're fairly well understood.  If you need different sizes, I'm OK
> > > with an atomic_pointer_t, or whatever.
> > 
> > FWIW Seconded.
> 
> I disagree.
> 
> Any _real_ CPU will simply never care about _anything_ else than just the 
> size of the datum in question.

..or alignment which a dedicated atomic type would allow to be attached.

bye, Roman
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