linux-kernel - Re: [PATCH] x86: Create clflush() inline, remove hardcoded wbinvd

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Message-ID: <46A39C64.9070301@zytor.com>
Date:	Sun, 22 Jul 2007 11:05:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Create clflush() inline, remove hardcoded wbinvd

Andi Kleen wrote:
>> The main reason is that everyone seems to invoke it either incorrectly
> Where is it incorrect? 

Using "r" or "m" (as opposed as "+m") gives gcc the wrong dependency
information, and it could, at least in theory, cause memory references
to be moved around it -- especially when using "r".

	-hpa
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