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

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Message-ID: <8764colao1.fsf@suzuka.mcnaught.org>
Date:	Wed, 06 Dec 2006 21:09:02 -0500
From:	Douglas McNaught <doug@...aught.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	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

Matthew Wilcox <matthew@....cx> writes:

> On Wed, Dec 06, 2006 at 05:36:29PM -0800, Linus Torvalds wrote:
>> Or are you saying that gcc aligns normal 32-bit entities at 
>> 16-bit alignment? Neither of those sound very likely.
>
> alignof(u32) is 2 on m68k.  Crazy, huh?

The original 68000 had a 16-bit bus (but 32-bit registers), which is
probably why it's that way.

-Doug
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