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

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Message-ID: <Pine.LNX.4.64.0612061735150.3542@woody.osdl.org>
Date:	Wed, 6 Dec 2006 17:36:29 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Roman Zippel <zippel@...ux-m68k.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



On Thu, 7 Dec 2006, Roman Zippel wrote:
>
> m68060 produces a trap for unaligned atomic access, unfortunately standard 
> alignment is smaller than this.

Umm. on 68060, since it's 32-bit, you'd only have the 32-bit case. Are you 
saying that you can't do a 32-bit atomic access at any 32-bit aligned 
boundary? Or are you saying that gcc aligns normal 32-bit entities at 
16-bit alignment? Neither of those sound very likely.

		Linus
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