linux-kernel - Re: [PATCH 1/2 V3] hwmon: (coretemp) Detect the thermal sensors by CPUID

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Date:	Tue, 11 May 2010 17:45:19 -0400
From:	Valdis.Kletnieks@...edu
To:	Huaxu Wan <huaxu.wan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	huaxu.wan@...el.com, Carsten Emde <Carsten.Emde@...dl.org>
Subject: Re: [PATCH 1/2 V3] hwmon: (coretemp) Detect the thermal sensors by CPUID

On Tue, 11 May 2010 16:01:12 +0800, Huaxu Wan said:
> The thermal sensors of Intel(R) CPUs can be detected by CPUID instruction,
> indicated by CPUID.06H.EAX[0].
> 
> Signed-off-by: Huaxu Wan <huaxu.wan@...ux.intel.com>
> Signed-off-by: Carsten Emde <C.Emde@...dl.org>
> ---
>  drivers/hwmon/coretemp.c |   34 +++++++++++++---------------------
>  1 files changed, 13 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index e9b7fbc..be0ddcf 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -451,28 +451,20 @@ static int __init coretemp_init(void)
> 
>         for_each_online_cpu(i) {
>                 struct cpuinfo_x86 *c = &cpu_data(i);
> +               /*
> +                * CPUID.06H.EAX[0] indicates whether the CPU has thermal
> +                * sensors. We check this bit only, all the early CPUs
> +                * without thermal sensors will be filtered out.
> +                */
> +               if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01)) {
> +                       err = coretemp_device_add(i);
> +                       if (err)
> +                               goto exit_devices_unreg;

OK, that looks sane. :)  For what it's worth, feel free to stick on a

Reviewed-By: Valdis Kletnieks <valdis.kletnieks@...edu>

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