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

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Message-ID: <Pine.LNX.4.64.0612061155590.3542@woody.osdl.org>
Date:	Wed, 6 Dec 2006 11:56:55 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Matthew Wilcox <matthew@....cx>
cc:	Al Viro <viro@....linux.org.uk>,
	Christoph Lameter <clameter@....com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...l.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Linux Kernel Mailing List <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 Wed, 6 Dec 2006, Linus Torvalds wrote:
> 
> Your problem will be, of course, that any architecture that does this in 
> hardware will just DoTheRightThing, and as such, broken architectures with 
> bad locking primitives will have to test and do source-level analysis 
> more.

(The underlying thread here being that the workqueue stuff _should_ be 
safe in this regard. But the "testing will not catch bugs like these is 
certainly true in general)

		Linus
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