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Date: Tue, 12 Mar 2013 06:34:46 -0700
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Li Zefan <lizefan@huawei.com>, LKML <linux-kernel@vger.kernel.org>,
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        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Jiri Kosina <jkosina@suse.cz>, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>, Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: [PATCH] device: separate all subsys mutexes (was: Re: [BUG]
 potential deadlock led by cpu_hotplug lock (memcg involved))
Message-ID: <20130312133446.GA3514@kroah.com>
References: <513ECCFE.3070201@huawei.com>
 <20130312101555.GB30758@dhcp22.suse.cz>
 <20130312110750.GC30758@dhcp22.suse.cz>
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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.

thanks,

greg k-h