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

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Message-ID: <Pine.LNX.4.64.0612081045430.3516@woody.osdl.org>
Date:	Fri, 8 Dec 2006 10:46:17 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	David Howells <dhowells@...hat.com>
cc:	Christoph Lameter <clameter@....com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>, 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, David Howells wrote:
> 
> In fact I think more things have LL/SC than have CMPXCHG.

But you cannot expose ll/sc to C, so that's a bogus argument.

If you do ll/sc, you need to program in assembly language.

		Linus
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