linux-kernel - Re: [PATCH -v2] device: separate all subsys mutexes (was: Re: [BUG] potential deadlock led by cpu

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Message-ID: <20130312184718.GA9749@kroah.com>
Date:	Tue, 12 Mar 2013 11:47:18 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Li Zefan <lizefan@...wei.com>, LKML <linux-kernel@...r.kernel.org>,
	cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH -v2] device: separate all subsys mutexes (was: Re: [BUG]
 potential deadlock led by cpu_hotplug lock (memcg involved))

On Tue, Mar 12, 2013 at 05:21:19PM +0100, Michal Hocko wrote:
> On Tue 12-03-13 06:34:46, Greg Kroah-Hartman wrote:
> > On Tue, Mar 12, 2013 at 02:05:04PM +0100, Michal Hocko wrote:
> > > The fix is quite simple. We can pull the key inside bus_type structure
> > > because they are defined per device so the pointer will be unique as
> > > well. bus_register doesn't need to be a macro anymore so change it
> > > to the inline. We could get rid of __bus_register as there is no other
> > > caller but maybe somebody will want to use a different key so keep it
> > > around for now.
> > 
> > Nice work, but just drop __bus_register(), no one should need to use a
> > new key for this type of thing, now that you have added a per-bus_type
> > variable.
> 
> OK v2 below. I have also ranamed __key to lock_key. Who is going to take
> the patch?

I will, thanks.

greg k-h
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