linux-kernel - Re: CPUFREQ-CPUHOTPLUG: Possible circular locking dependency

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Message-Id: <20061129130556.d20c726e.akpm@osdl.org>
Date:	Wed, 29 Nov 2006 13:05:56 -0800
From:	Andrew Morton <akpm@...l.org>
To:	ego@...ibm.com
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, torvalds@...l.org,
	davej@...hat.com, dipankar@...ibm.com, vatsa@...ibm.com
Subject: Re: CPUFREQ-CPUHOTPLUG: Possible circular locking dependency

On Wed, 29 Nov 2006 20:54:04 +0530
Gautham R Shenoy <ego@...ibm.com> wrote:

> Ok, so to cut the long story short, 
> - While changing governor from anything to
> ondemand, locks are taken in the following order
> 
> policy->lock ===> dbs_mutex ===> workqueue_mutex.
> 
> - While offlining a cpu, locks are taken in the following order
> 
> cpu_add_remove_lock ==> sched_hotcpu_mutex ==> workqueue_mutex ==
> ==> cache_chain_mutex ==> policy->lock.

What functions are taking all these locks?  (ie: the callpath?)
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