linux-kernel - Re: [lm-sensors] [PATCH] drivers/hwmon/coretemp: Fix incorrect hot-removed CPU's core sensor issue

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Message-ID: <20100819170717.GA4312@ericsson.com>
Date:	Thu, 19 Aug 2010 10:07:17 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
CC:	Rudolf Marek <r.marek@...embler.cz>,
	Huaxu Wan <huaxu.wan@...el.com>, H Peter Anvin <hpa@...or.com>,
	Chen Gong <gong.chen@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [lm-sensors] [PATCH] drivers/hwmon/coretemp: Fix incorrect
 hot-removed CPU's core sensor issue

On Wed, Aug 18, 2010 at 06:53:45PM -0400, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> In current coretemp driver, when a CPU in dev_list is hot-removed, although its
> HT sibling is still running, its core sensor is gone and not available to user
> level application any more.
> 
> When a CPU is hot-removed, its core sensor should be still available to upper
> level application as long as the hot-removed CPU's HT sibling is still running.
> A core sensor is invisible to user level only when all of siblings in a core are
> hot-removed.
>
Isn't that just a short term (ie a couple of ms or even us) race condition
until the sibling is removed as well ? If so, why bother ?

Thanks,
Guenter

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