linux-kernel - Re: [PATCH] Use correct macros in raid code, not raw asm

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Message-Id: <20061228155659.462eaa9c.akpm@osdl.org>
Date:	Thu, 28 Dec 2006 15:56:59 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andi Kleen <ak@....de>, Linus Torvalds <torvalds@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Neil Brown <neilb@...e.de>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.osdl.org>
Subject: Re: [PATCH] Use correct macros in raid code, not raw asm

On Fri, 29 Dec 2006 10:34:21 +1100
Rusty Russell <rusty@...tcorp.com.au> wrote:

> This make sure it's paravirtualized correctly when CONFIG_PARAVIRT=y.
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff -r 4ff048622391 drivers/md/raid6x86.h
> --- a/drivers/md/raid6x86.h	Thu Dec 28 16:52:54 2006 +1100
> +++ b/drivers/md/raid6x86.h	Fri Dec 29 10:09:38 2006 +1100
> @@ -75,13 +75,14 @@ static inline unsigned long raid6_get_fp
>  	unsigned long cr0;
>  
>  	preempt_disable();
> -	asm volatile("mov %%cr0,%0 ; clts" : "=r" (cr0));
> +	cr0 = read_cr0();
> +	clts();
>  	return cr0;
>  }
>  
>  static inline void raid6_put_fpu(unsigned long cr0)
>  {
> -	asm volatile("mov %0,%%cr0" : : "r" (cr0));
> +	write_cr0(cr0);
>  	preempt_enable();
>  }
>  

Perhaps we also need:

--- a/drivers/md/raid6x86.h~use-correct-macros-in-raid-code-not-raw-asm-include
+++ a/drivers/md/raid6x86.h
@@ -21,6 +21,8 @@
 
 #if defined(__i386__) || defined(__x86_64__)
 
+#include <asm/system.h>
+
 #ifdef __x86_64__
 
 typedef struct {
_

?
-
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