linux-kernel - Re: [PATCH 3/2] fix flush_workqueue() vs CPU

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Date:	Tue, 2 Jan 2007 16:27:27 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/2] fix flush_workqueue() vs CPU_DEAD race

On Sat, 30 Dec 2006 19:10:31 +0300
Oleg Nesterov <oleg@...sign.ru> wrote:

> "[PATCH 1/2] reimplement flush_workqueue()" fixed one race when CPU goes down
> while flush_cpu_workqueue() plays with it. But there is another problem, CPU
> can die before flush_workqueue() has a chance to call flush_cpu_workqueue().
> In that case pending work_structs can migrate to CPU which was already checked,
> so we should redo the "for_each_online_cpu(cpu)" loop.
> 

I have a mental note that these:

extend-notifier_call_chain-to-count-nr_calls-made.patch
extend-notifier_call_chain-to-count-nr_calls-made-fixes.patch
extend-notifier_call_chain-to-count-nr_calls-made-fixes-2.patch
define-and-use-new-eventscpu_lock_acquire-and-cpu_lock_release.patch
define-and-use-new-eventscpu_lock_acquire-and-cpu_lock_release-fix.patch
eliminate-lock_cpu_hotplug-in-kernel-schedc.patch
eliminate-lock_cpu_hotplug-in-kernel-schedc-fix.patch
handle-cpu_lock_acquire-and-cpu_lock_release-in-workqueue_cpu_callback.patch

should be scrapped.  But really I forget what their status is.  Gautham,
can you please remind us where we're at?

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