linux-kernel - Re: [PATCH 2/3] x86, msr: rewrite AMD rd/wrmsr variants

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Date:	Sun, 30 Aug 2009 13:04:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <petkovbb@...glemail.com>
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	kjwinchester@...il.com, tglx@...utronix.de,
	borislav.petkov@....com, linux-tip-commits@...r.kernel.org
Subject: Re: [PATCH 2/3] x86, msr: rewrite AMD rd/wrmsr variants

On 08/30/2009 04:50 AM, Borislav Petkov wrote:
> +
> +#define memset(d,c,l) __builtin_memset(d,c,l)
>  static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
>  {
> -	int err;
> +	u32 gprs[8];
> +	int err, i;
> +
> +	memset(gprs, 0, sizeof(u32) * 8);
> +
> +	gprs[1] = msr;
> +	gprs[7] = 0x9c5a203a;
> +
> +	err = native_rdmsr_safe_regs(gprs);
> +
> +	*p = gprs[0] | ((u64)gprs[2] << 32);
>  
> -	*p = native_read_msr_amd_safe(msr, &err);
>  	return err;
>  }
>  

In file included from
/home/hpa/kernel/linux-2.6-tip.msr/arch/x86/include/asm/processor.h:21,
                 from
/home/hpa/kernel/linux-2.6-tip.msr/include/linux/prefetch.h:14,
                 from
/home/hpa/kernel/linux-2.6-tip.msr/include/linux/list.h:6,
                 from
/home/hpa/kernel/linux-2.6-tip.msr/include/linux/smp.h:11,
                 from
/home/hpa/kernel/linux-2.6-tip.msr/include/linux/kernel_stat.h:4,
                 from
/home/hpa/kernel/linux-2.6-tip.msr/arch/x86/kernel/irq_64.c:11:
/home/hpa/kernel/linux-2.6-tip.msr/arch/x86/include/asm/msr.h: In
function ‘rdmsrl_amd_safe’:
/home/hpa/kernel/linux-2.6-tip.msr/arch/x86/include/asm/msr.h:176:
warning: unused variable ‘i’


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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