linux-kernel - Re: [PATCH] x86/mce: Don't unregister CPU hotplug notifier in error path

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Date:	Sun, 22 Jun 2014 10:25:50 -0700 (PDT)
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	<bp@...en8.de>
Cc:	<tony.luck@...el.com>, <mattieu.souchaud@...e.fr>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/mce: Don't unregister CPU hotplug notifier in error
 path


----- bp@...en8.de wrote:

> On Fri, Jun 20, 2014 at 10:04:37PM -0400, Boris Ostrovsky wrote:
> > I'll try it later but this doesn't look sufficient to me: we might
> not
> > reach this point if subsys_system_register() or
> zalloc_cpumask_var()
> > fail.
> 
> If those fail, I'd say we have a much bigger problem than undeleted
> timers.


You can add 

Tested-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

if you prefer to go with that version. I still think it's not 100% reliable (because of what I said above) but at least it fixes the current breakage.

> 
> > We could register the notifier as the first thing in this routine
> > (probably after mce_available() succeeds).
> 
> I guess...


Actually that won't work --- we need to register bus at sysfs first.

-boris
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