From 26a2ac009c2b07e1959c8864ca23486c1c485587 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 23 Apr 2009 12:13:27 +0200
Subject: [PATCH] cfq-iosched: clear ->prio_trees[] on cfqd alloc

Not strictly needed, but we should make it clear that we init the
rbtree roots here.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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