linux-kernel - Re: [ANNOUNCE] 3.14-rt1

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Message-ID: <1398870957.5220.2.camel@marge.simpson.net>
Date:	Wed, 30 Apr 2014 17:15:57 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Nicholas Mc Guire <der.herr@...r.at>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: [ANNOUNCE] 3.14-rt1

On Wed, 2014-04-30 at 11:11 -0400, Steven Rostedt wrote:

> > Another little bug.  This hunk of patches/stomp-machine-raw-lock.patch
> > should be while (atomic_read(&done.nr_todo)) 
> > 
> > @@ -647,7 +671,7 @@ int stop_machine_from_inactive_cpu(int (
> >         ret = multi_cpu_stop(&msdata);
> > 
> >         /* Busy wait for completion. */
> > -       while (!completion_done(&done.completion))
> > +       while (!atomic_read(&done.nr_todo))
                   ^--- that ! needs to go away 
> 
> I don't see this in the code. That is, there is no "completion_done()"
> in stop_machine_from_inactive_cpu(). It is already an atomic_read().

Yes, but it should read "while (atomic_read(&done.nr_todo))"

-Mike

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