linux-kernel - Re: [PATCH] slub: Fix sysfs circular locking dependency

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Date:	Tue, 11 Jan 2011 08:37:29 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
CC:	Christoph Lameter <cl@...ux.com>,
	Bart Van Assche <bvanassche@....org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] slub: Fix sysfs circular locking dependency

On 1/10/11 10:30 PM, David Rientjes wrote:
> On Mon, 10 Jan 2011, Christoph Lameter wrote:
>
>> New patch that just covers the slub changes.
>>
>> Subject: slub: Avoid use of slub_lock in show_slab_objects()
>>
>> The purpose of the locking is to prevent removal and additions
>> of nodes when statistics are gathered for a slab cache. So we
>> need to avoid racing with memory hotplug functionality.
>>
>> It is enough to take the memory hotplug locks there instead
>> of the slub_lock.
>>
>> online_pages() currently does not acquire the memory_hotplug
>> lock. Another patch will be submitted by the memory hotplug
>> authors to take the memory hotplug lock and describe the
>> uses of the memory hotplug lock to protect against
>> adding and removal of nodes from non hotplug data structures.
>>
>> Signed-off-by: Christoph Lameter<cl@...ux.com>
> Acked-by: David Rientjes<rientjes@...gle.com>

Is this safe to be applied without the other hotplug parts?

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