From: Tejun Heo <tj@kernel.org>
Date: Tue, 14 May 2013 20:52:36 +0000 (-0700)
Subject: blk-throttle: add throtl_service_queue->parent_sq
X-Git-Tag: v3.11-rc1~21^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77216b0484817817a18aaa6b089dffe49070f7c1;p=pandora-kernel.git

blk-throttle: add throtl_service_queue->parent_sq

To prepare for hierarchy support, this patch adds
throtl_service_queue->service_sq which points to the arent
service_queue.  Currently, for all service_queues embedded in
throtl_grps, it points to throtl_data->service_queue.  As
throtl_data->service_queue doesn't have a parent its parent_sq is set
to NULL.

There are a number of functions which take both throtl_grp *tg and
throtl_service_queue *parent_sq.  With this patch, the parent
service_queue can be determined from @tg and the @parent_sq arguments
are removed.

This patch doesn't make any behavior differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
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