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

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Message-ID: <1398051078.4437.6.camel@marge.simpson.net>
Date:	Mon, 21 Apr 2014 05:31:18 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.14-rt1

On Sat, 2014-04-19 at 16:46 +0200, Mike Galbraith wrote: 
> Hi Sebastian,
> 
> On Fri, 2014-04-11 at 20:57 +0200, Sebastian Andrzej Siewior wrote: 
> > Dear RT folks!
> > 
> > I'm pleased to announce the v3.14-rt1 patch set.
> 
> This hunk in hotplug-light-get-online-cpus.patch looks like a bug.
> 
> @@ -333,7 +449,7 @@ static int __ref _cpu_down(unsigned int
>                 /* CPU didn't die: tell everyone.  Can't complain. */
>                 smpboot_unpark_threads(cpu);
>                 cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
> -               goto out_release;
> +               goto out_cancel;
>         }
>         BUG_ON(cpu_online(cpu));
> 

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))
                cpu_relax();

        mutex_unlock(&stop_cpus_mutex);
                                        

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