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

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Message-ID: <Pine.LNX.4.64.0612070219540.1867@scrub.home>
Date:	Thu, 7 Dec 2006 02:24:30 +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>,
	Andrew Morton <akpm@...l.org>, 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:

> > > 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.
> 
> Can you give any example of a real CPU where alignment matters?
> 
> Sure, it needs to be naturally aligned, but that's true of _any_ type in 
> the kernel. We don't do unaligneds without "get_unaligned()" and friends.

m68060 produces a trap for unaligned atomic access, unfortunately standard 
alignment is smaller than this.

bye, Roman
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