linux-kernel - Re: [-mm patch] {rd,wr}msr_on

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Message-ID: <20070220002145.GP13958@stusta.de>
Date:	Tue, 20 Feb 2007 01:21:45 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...nvz.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [-mm patch] {rd,wr}msr_on_cpu SMP=n optimization

On Mon, Feb 19, 2007 at 07:14:34PM -0500, Dave Jones wrote:
> On Tue, Feb 20, 2007 at 01:07:13AM +0100, Adrian Bunk wrote:
>...
>  > +#ifdef CONFIG_SMP
>  >  void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
>  >  void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
>  > +#else  /*  CONFIG_SMP  */
>  > +static inline void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
>  > +{
>  > +	rdmsr(msr_no, *l, *h);
>  > +}
>  > +static inline void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
>  > +{
>  > +	wrmsr(msr_no, l, h);
>  > +}
>  > +#endif  /*  CONFIG_SMP  */
> 
> BUG_ON(cpu!=smp_processor_id()) maybe?

This is the CONFIG_SMP=n case.

> 		Dave

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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