linux-kernel - Re: [PATCH 6/8] i386: bitops: Don't mark memory as clobbered unnecessarily

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Message-ID: <alpine.LFD.0.999.0707231054290.3607@woody.linux-foundation.org>
Date:	Mon, 23 Jul 2007 10:55:15 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Satyam Sharma <ssatyam@....iitk.ac.in>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 6/8] i386: bitops: Don't mark memory as clobbered
 unnecessarily



On Mon, 23 Jul 2007, Satyam Sharma wrote:
> 
> The goal is to let gcc generate good, beautiful, optimized code.

No. The point is to let gcc generate *correct* code.

It's either "=m" together with "memory", or it's "+m".

You just introduced a bug.

		Linus
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