From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 16 May 2013 18:03:12 +0000 (+0200)
Subject: f2fs, lockdep: annotate mutex_lock_all()
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~81^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bfe35965ecdc6038314d03456b94d9ba451c289d;p=pandora-kernel.git

f2fs, lockdep: annotate mutex_lock_all()

Majianpeng reported a lockdep splat for f2fs. It turns out mutex_lock_all()
acquires an array of locks (in global/local lock style).

Any such operation is always serialized using cp_mutex, therefore there is no
fs_lock[] lock-order issue; tell lockdep about this using the
mutex_lock_nest_lock() primitive.

Reported-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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