linux-kernel - Re: [PATCH 2/3] x86, intel: Use cpu

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Date:	Thu, 26 May 2011 09:39:25 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/3] x86, intel: Use cpu_update for Atom errata check

On Wed, 25 May 2011 12:32:27 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Now that the cpu update level is available the Atom PSE errata
> check can use it directly without reading the MSR again.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Acked-by: Jean Delvare <khali@...ux-fr.org>

> ---
>  arch/x86/kernel/cpu/intel.c |   15 ++++-----------
>  1 files changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
> index ba5ba17..701efa4 100644
> --- a/arch/x86/kernel/cpu/intel.c
> +++ b/arch/x86/kernel/cpu/intel.c
> @@ -55,17 +55,10 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
>  	 * need the microcode to have already been loaded... so if it is
>  	 * not, recommend a BIOS update and disable large pages.
>  	 */
> -	if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2) {
> -		u32 ucode, junk;
> -
> -		wrmsr(MSR_IA32_UCODE_REV, 0, 0);
> -		sync_core();
> -		rdmsr(MSR_IA32_UCODE_REV, junk, ucode);
> -
> -		if (ucode < 0x20e) {
> -			printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
> -			clear_cpu_cap(c, X86_FEATURE_PSE);
> -		}
> +	if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2 &&
> +	    c->cpu_update < 0x20e) {
> +		printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
> +		clear_cpu_cap(c, X86_FEATURE_PSE);
>  	}
>  
>  #ifdef CONFIG_X86_64


-- 
Jean Delvare
--
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