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

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Message-ID: <1363102105.24558.4.camel@laptop>
Date:	Tue, 12 Mar 2013 16:28:25 +0100
From:	Peter Zijlstra <peterz@...radead.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>, Ingo Molnar <mingo@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] device: separate all subsys mutexes (was: Re: [BUG]
 potential deadlock led by cpu_hotplug lock (memcg involved))

On Tue, 2013-03-12 at 14:05 +0100, Michal Hocko wrote:
> @@ -111,17 +111,17 @@ struct bus_type {
>         struct iommu_ops *iommu_ops;
>  
>         struct subsys_private *p;
> +       struct lock_class_key __key;
>  };

Is struct bus_type constrained to static storage or can people go an
allocate this stuff dynamically? If so, this patch is broken.

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