linux-kernel - RE: [PATCH 3/3] coretemp: Get microcode revision from cpu

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Date:	Tue, 24 May 2011 16:58:56 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>, "x86@...nel.org" <x86@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	"jbeulich@...ell.com" <jbeulich@...ell.com>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>
Subject: RE: [PATCH 3/3] coretemp: Get microcode revision from cpu_data

> Subject: [PATCH 3/3] coretemp: Get microcode revision from cpu_data
> 
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Now that the ucode revision is available in cpu_data remove
> the existing code in coretemp.c to query it manually. Read the ucode
> revision from cpu_data instead
> 
> Cc: jbeulich@...ell.com
> Cc: fenghua.yu@...el.com
> Cc: khali@...ux-fr.org
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  drivers/hwmon/coretemp.c |   29 +++++------------------------
>  1 files changed, 5 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 9577c43..aff3e2c 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -324,15 +324,6 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32
> id, struct device *dev)
>  	}
>  }
> 
> -static void __devinit get_ucode_rev_on_cpu(void *edx)
> -{
> -	u32 eax;
> -
> -	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
> -	sync_core();
> -	rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx);
> -}
> -
>  static int get_pkg_tjmax(unsigned int cpu, struct device *dev)
>  {
>  	int err;
> @@ -433,21 +424,11 @@ static int chk_ucode_version(struct
> platform_device *pdev)
>  	 * Readings might stop update when processor visited too deep
> sleep,
>  	 * fixed for stepping D0 (6EC).
>  	 */
> -	if (c->x86_model == 0xe && c->x86_mask < 0xc) {
> -		/* check for microcode update */
> -		err = smp_call_function_single(pdev->id,
> get_ucode_rev_on_cpu,
> -					       &edx, 1);
> -		if (err) {
> -			dev_err(&pdev->dev,
> -				"Cannot determine microcode revision of "
> -				"CPU#%u (%d)!\n", pdev->id, err);
> -			return -ENODEV;
> -		} else if (edx < 0x39) {
> -			dev_err(&pdev->dev,
> -				"Errata AE18 not fixed, update BIOS or "
> -				"microcode of the CPU!\n");
> -			return -ENODEV;
> -		}
> +	if (c->x86_model == 0xe && c->x86_mask < 0xc && c->x86_cpu_update
> < 0x39) {
> +		dev_err(&pdev->dev,
> +			"Errata AE18 not fixed, update BIOS or "
> +			"microcode of the CPU!\n");
> +		return -ENODEV;
>  	}
>  	return 0;
>  }
> --
> 1.7.4.4

With this patch, the variable err and edx defined in chk_ucode_version() won't be used and should be removed to avoid compilation warnings.

Thanks.

-Fenghua

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