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From: Andi Kleen <ak@suse.de>
To: Avi Kivity <avi@qumranet.com>
Cc: Glauber de Oliveira Costa <gcosta@redhat.com>,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	glommer@gmail.com, tglx@linutronix.de, mingo@elte.hu,
	ehabkost@redhat.com, jeremy@goop.org, anthony@codemonkey.ws,
	virtualization@lists.linux-foundation.org, rusty@rustcorp.com.au,
	ak@suse.de, chrisw@sous-sol.org, rostedt@goodmis.org,
	hpa@zytor.com
Subject: Re: [PATCH 4/8] unify paravirt parts of system.h
Date: Tue, 4 Dec 2007 20:34:32 +0100
Message-ID: <20071204193432.GI11764@bingen.suse.de> (raw)
In-Reply-To: <4755A809.4050305@qumranet.com>

On Tue, Dec 04, 2007 at 09:18:33PM +0200, Avi Kivity wrote:
> 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)

Linux never uses that register. The only user is suspend save/restore, 
but that' bogus because it wasn't ever initialized by Linux in the first
place. It could be probably all safely removed.

-Andi


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-04 16:06 [PATCH 0/8] Integrate system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 1/8] remove volatile keyword from clflush Glauber de Oliveira Costa
2007-12-04 16:06   ` [PATCH 2/8] put together equal pieces of system.h Glauber de Oliveira Costa
2007-12-04 16:06     ` [PATCH 3/8] unify load_segment macro Glauber de Oliveira Costa
2007-12-04 16:06       ` [PATCH 4/8] unify paravirt parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06         ` [PATCH 5/8] remove unused macro Glauber de Oliveira Costa
2007-12-04 16:06           ` [PATCH 6/8] unify smp parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06             ` [PATCH 7/8] move switch_to macro to system.h Glauber de Oliveira Costa
2007-12-04 16:06               ` [PATCH 8/8] unify system.h Glauber de Oliveira Costa
2007-12-04 19:18         ` [PATCH 4/8] unify paravirt parts of system.h Avi Kivity
2007-12-04 19:34           ` Andi Kleen [this message]
2007-12-05 16:30             ` Pavel Machek
2007-12-15 13:17               ` Ingo Molnar
2007-12-17  0:27                 ` Rafael J. Wysocki
2007-12-17  0:23                   ` Pavel Machek
2007-12-17  0:58                     ` Rafael J. Wysocki
2007-12-15 13:26               ` Andi Kleen
2007-12-15 22:54                 ` Pavel Machek
2007-12-15 20:28               ` H. Peter Anvin
2007-12-04 19:41           ` Glauber de Oliveira Costa
2007-12-04 22:14             ` Denys Vlasenko

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