linux-kernel - Re: [lm-sensors] [PATCH] x86/hwmon: fix initialization of coretemp

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Message-ID: <4C8F178F.2080306@linux.intel.com>
Date:	Tue, 14 Sep 2010 14:34:55 +0800
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	fenghua.yu@...el.com, khali@...ux-fr.org,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	hpa@...or.com, mingo@...e.hu, tglx@...utronix.de
Subject: Re: [lm-sensors] [PATCH] x86/hwmon: fix initialization of coretemp

于 9/13/2010 6:17 PM, Jan Beulich 写道:
> Using cpuid_eax() to determine feature availability on other than
> the current CPU is invalid. And feature availability should also be
> checked in the hotplug code path.
>
> Signed-off-by: Jan Beulich<jbeulich@...ell.com>
> Cc: Rudolf Marek<r.marek@...embler.cz>
>
> ---
>   arch/x86/include/asm/cpufeature.h |    1 +
>   arch/x86/kernel/cpu/scattered.c   |    1 +
>   drivers/hwmon/coretemp.c          |   29 +++++++++++++----------------
>   3 files changed, 15 insertions(+), 16 deletions(-)
>
> --- linux-2.6.36-rc4/arch/x86/include/asm/cpufeature.h	2010-09-13 08:44:55.000000000 +0200
> +++ 2.6.36-rc4-x86-coretemp-feature-check/arch/x86/include/asm/cpufeature.h	2010-09-01 09:18:17.000000000 +0200
> @@ -168,6 +168,7 @@
>   #define X86_FEATURE_XSAVEOPT	(7*32+ 4) /* Optimized Xsave */
>   #define X86_FEATURE_PLN		(7*32+ 5) /* Intel Power Limit Notification */
>   #define X86_FEATURE_PTS		(7*32+ 6) /* Intel Package Thermal Status */
> +#define X86_FEATURE_DTS		(7*32+ 7) /* Digital Thermal Sensor */

Do we really need a new CPU flag ?
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