linux-kernel - Re: [RFC][PATCH 0/4] Redesign cpu

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Message-Id: <20060827102116.f9077bac.akpm@osdl.org>
Date:	Sun, 27 Aug 2006 10:21:16 -0700
From:	Andrew Morton <akpm@...l.org>
To:	dipankar@...ibm.com
Cc:	Linus Torvalds <torvalds@...l.org>, Dave Jones <davej@...hat.com>,
	ego@...ibm.com, rusty@...tcorp.com.au,
	linux-kernel@...r.kernel.org, arjan@...el.linux.com, mingo@...e.hu,
	vatsa@...ibm.com, ashok.raj@...el.com
Subject: Re: [RFC][PATCH 0/4] Redesign cpu_hotplug locking.

On Sun, 27 Aug 2006 16:36:58 +0530
Dipankar Sarma <dipankar@...ibm.com> wrote:

> > Did you look?  workqueue_mutex is used to protect per-cpu workqueue
> > resources.  The lock is taken prior to modification of per-cpu resources
> > and is released after their modification.  Very very simple.
> 
> I did and there is no lock named workqueue_mutex. workqueue_cpu_callback()
> is farily simple and doesn't have the issues in cpufreq that
> we are talking about (lock_cpu_hotplug() in cpu callback path).

http://www.kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=9b41ea7289a589993d3daabc61f999b4147872c4
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