linux-kernel - Re: [PATCH 4/7] Allow selected bug checks to be skipped by paravirt kernels

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Date:	Wed, 1 Nov 2006 17:40:19 -0500
From:	Dave Jones <davej@...hat.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Chris Wright <chrisw@...s-sol.org>, akpm@...l.org, ak@....de,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org
Subject: Re: [PATCH 4/7] Allow selected bug checks to be skipped by paravirt kernels

On Wed, Nov 01, 2006 at 01:17:53PM +0100, Pavel Machek wrote:

 > > +++ linux-2.6-pv/arch/i386/kernel/cpu/intel.c
 > > @@ -107,7 +107,7 @@ static void __cpuinit init_intel(struct 
 > >  	 * Note that the workaround only should be initialized once...
 > >  	 */
 > >  	c->f00f_bug = 0;
 > > -	if ( c->x86 == 5 ) {
 > > +	if (!paravirt_enabled() && c->x86 == 5) {
 > 
 > I'd do x86==5 check first... pentiums are not common any more.

It's not like paravirt_enabled will be common-case either,
and is this isn't exactly a performance critical piece of code,
it doesn't really matter which way around the checks are done.

	Dave

-- 
http://www.codemonkey.org.uk
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