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

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Message-ID: <p73myxlsfl4.fsf@bingen.suse.de>
Date:	24 Jul 2007 22:37:43 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Trent Piepho <xyzzy@...akeasy.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Satyam Sharma <ssatyam@....iitk.ac.in>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 6/8] i386: bitops: Don't mark memory as clobbered unnecessarily

Linus Torvalds <torvalds@...ux-foundation.org> writes:
> 
> (Yes, the "asm volatile" may do so too, but it's very unclear what the 
> "volatile" on the asm actually does, so ..)

Without the volatile they get completely optimized away :/
[tried that, cost a lot of debugging time -- empty string functions
cause a lot of strange side effects]

-Andi
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