linux-kernel - Re: [PATCH 4/8] unify paravirt parts of system.h

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Date:	Tue, 04 Dec 2007 21:18:33 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Glauber de Oliveira Costa <gcosta@...hat.com>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, mingo@...e.hu,
	ehabkost@...hat.com, jeremy@...p.org, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org, hpa@...or.com
Subject: Re: [PATCH 4/8] unify paravirt parts of system.h

Glauber de Oliveira Costa wrote:
> This patch moves the i386 control registers manipulation functions,
> wbinvd, and clts functions to system.h. They are essentially the same
> as in x86_64, except for the cr8 register, which we add.
>
> +
> +static inline unsigned long native_read_cr8(void)
> +{
> +	unsigned long cr8;
> +	asm volatile("mov %%cr8,%0" : "=r" (cr8), "=m" (__force_order));
> +	return cr8;
> +}
> +
>   

There is no cr8 register on i386.  This had better be protected by an 
#ifdef.

(you're likely not getting an error since it's a static inline, so the 
asm is never emitted)

-- 
Any sufficiently difficult bug is indistinguishable from a feature.

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