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

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Message-ID: <46A12A3A.4020305@zytor.com>
Date:	Fri, 20 Jul 2007 14:33:46 -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:
> On Fri, Jul 20, 2007 at 02:19:58PM -0700, H. Peter Anvin wrote:
>> Create an inline function for clflush(), with the proper arguments,
>> and use it instead of hard-coding the instruction.
>>
>> This also removes one instance of hard-coded wbinvd, based on a patch
>> by Bauder de Oliveira Costa.
> 
> I don't see much sense in it. CLFLUSH is not priviledged, paravirt
> doesn't need to change and this adds just an unnecessary layer of abstraction.

The main reason is that everyone seems to invoke it either incorrectly
or suboptimally.

	-hpa
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