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

[Rusty Russell]

On Thu, 2006-12-28 at 15:56 -0800, Andrew Morton wrote:
> On Fri, 29 Dec 2006 10:34:21 +1100
> Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
> 
> > This make sure it's paravirtualized correctly when CONFIG_PARAVIRT=y.
> > 
> > Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
> > 
> > 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>
> +

The code looks like it's designed to be included from userspace for
testing; as it compiles without this include (and has no other
includes), I chose not to add it.

Linus makes a good point, but someone who actually knows the code
should, y'know, test it and stuff...

Rusty.


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