From: Tejun Heo <tj@kernel.org>
Date: Fri, 14 Aug 2009 06:00:49 +0000 (+0900)
Subject: percpu: fix pcpu_reclaim() locking
X-Git-Tag: v2.6.32-rc1~676^2^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=971f3918a5a8febbbab355079972fb31ee7c0f33;p=pandora-kernel.git

percpu: fix pcpu_reclaim() locking

pcpu_reclaim() calls pcpu_depopulate_chunk() which makes use of pages
array and bitmap returned by pcpu_get_pages_and_bitmap() and thus
should be called under pcpu_alloc_mutex.  pcpu_reclaim() released the
mutex before calling depopulate leading to double free and other
strange problems caused by the unexpected concurrent usages of pages
array and bitmap.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
---

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