Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

From: Srivatsa Vaddagiri
Date: Wed Feb 21 2007 - 10:54:16 EST

On Wed, Feb 21, 2007 at 05:30:10PM +0300, Oleg Nesterov wrote:
> Agreed. Note that we don't need the new "del_work". It is always safe to
> use cancel_work_sync() if we know that the workqueue is frozen, it won't
> block. We can also do
> if (!cancel_delayed_work())
> cancel_work_sync();
> but it is ok to do cancel_work_sync() unconditionally.

Argh ..I should keep referring to recent sources. I didnt see
cancel_work_sync() in my sources (2.6.20-rc4) and hence invented that
del_work()! Anyway thanx for pointing out.

This change will probably let us do CPU_DOWN_PREPARE after
freeze_processes(). However I will keep my fingers crossed on whether it
is really a good idea to send CPU_DOWN/UP_PREPARE after
freeze_processes() until we get more review/testing results.

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