linux-kernel - Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread

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Message-Id: <20070420103052.686f3c71.akpm@linux-foundation.org>
Date:	Fri, 20 Apr 2007 10:30:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	ego@...ibm.com
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Oleg Nesterov <oleg@...sign.ru>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, vatsa@...ibm.com,
	paulmck@...ibm.com, pavel@....cz
Subject: Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop race

On Fri, 20 Apr 2007 17:56:09 +0530
Gautham R Shenoy <ego@...ibm.com> wrote:

> > I mean, we already have four of them (PF_NOFREEZE, PF_FROZEN,
> > PF_FREEZER_SKIP, TIF_FREEZE), and you will need to introduce two more for
> > the freezer-based CPU hotplug, so if yet another one is needed, that will make
> > up almost a separate u8 field ...
> 
> I am perfectly ok with it. But I am not sure if everybody would agree to have
> another field in the task struct, though in this case it does make sense :-)

OK by me.  You might want to consider making that fields's locking protocol
be set_bit(), clear_bit(), etc rather than task_lock().
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