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[PATCH 0/8] CPU-Hotplug: Fix CPU-Hotplug <--> cpufreq locking dependency

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From: Gautham R Shenoy <ego@...>
To: <linux-kernel@...>, Zdenek Kabelac <zdenek.kabelac@...>, Peter Zijlstra <a.p.zijlstra@...>, Oleg Nesterov <oleg@...>, Heiko Carstens <heiko.carstens@...>, Rafael J. Wysocki <rjw@...>
Cc: Andrew Morton <akpm@...>, Ingo Molnar <mingo@...>, Srivatsa Vaddagiri <vatsa@...>
Subject: [PATCH 0/8] CPU-Hotplug: Fix CPU-Hotplug &lt;--&gt; cpufreq locking dependency
Date: Tuesday, April 29, 2008 - 8:56 am

Hello everyone,

A couple of months ago Zdenek Kabelac had reported a Circular locking
dependency in resume, which was related to the locking dependency
between the cpufreq and CPU-Hotplug subsystems.

http://lkml.org/lkml/2008/2/26/479

This patchset aggregates the various patches that have been posted in
the recent past, to solve this problem.

There are a few more TODO items in CPU-Hotplug , unrelated to
this problem, that cropped up in the various discussions.
They will be posted in a seperate thread.

The patchstack has been lightly tested on a 4-way x86 machine with
CPU-Hotplug running in parallel with kernbench and changing cpufreq
governors simultaneously.

Awaiting your feedback,
gautham
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Messages in current thread:
[PATCH 0/8] CPU-Hotplug: Fix CPU-Hotplug <--> cpufreq ..., Gautham R Shenoy, (Tue Apr 29, 8:56 am)
[PATCH 8/8] cpufreq: Nest down_write/read(cpufreq_rwsem) wit..., Gautham R Shenoy, (Tue Apr 29, 9:05 am)
[PATCH 7/8] cpu_hotplug: Introduce try_get_online_cpus(), Gautham R Shenoy, (Tue Apr 29, 9:03 am)
[PATCH 6/8] lockdep: annotate cpu_hotplug, Gautham R Shenoy, (Tue Apr 29, 9:02 am)
[PATCH 5/8] cpu: cpu-hotplug deadlock, Gautham R Shenoy, (Tue Apr 29, 9:02 am)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Oleg Nesterov, (Tue Apr 29, 10:33 am)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Gautham R Shenoy, (Wed Apr 30, 1:37 am)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Oleg Nesterov, (Wed Apr 30, 7:43 am)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Peter Zijlstra, (Tue Apr 29, 11:09 am)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Oleg Nesterov, (Tue Apr 29, 12:45 pm)
Re: [PATCH 5/8] cpu: cpu-hotplug deadlock, Peter Zijlstra, (Tue Apr 29, 1:31 pm)
[PATCH 4/8] net: af_netlink: deadlock, Gautham R Shenoy, (Tue Apr 29, 9:01 am)
Re: Hans Reiser, reiserfs developer, linux-os (Dick Johnson), (Tue Apr 29, 9:19 am)
[PATCH 3/8] lockdep: fix fib_hash softirq inversion, Gautham R Shenoy, (Tue Apr 29, 9:00 am)
Re: [PATCH 3/8] lockdep: fix fib_hash softirq inversion, Peter Zijlstra, (Tue Apr 29, 10:45 am)
[PATCH 2/8] lockdep: reader-in-writer recursion, Gautham R Shenoy, (Tue Apr 29, 8:58 am)
[PATCH 1/8] lockdep: fix recursive read lock validation, Gautham R Shenoy, (Tue Apr 29, 8:57 am)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Bart Van Assche, (Tue Apr 29, 9:16 am)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Peter Zijlstra, (Tue Apr 29, 10:57 am)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Bart Van Assche, (Tue Apr 29, 11:03 am)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Peter Zijlstra, (Tue Apr 29, 11:15 am)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Bart Van Assche, (Tue Apr 29, 12:03 pm)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Peter Zijlstra, (Tue Apr 29, 12:15 pm)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Bart Van Assche, (Tue Apr 29, 12:29 pm)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Peter Zijlstra, (Tue Apr 29, 1:04 pm)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Bart Van Assche, (Tue Apr 29, 1:45 pm)
Re: [PATCH 1/8] lockdep: fix recursive read lock validation, Peter Zijlstra, (Tue Apr 29, 1:58 pm)