From 4ceab71b9d84e55b59a76b54b2999dc377aae6e6 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Fri, 19 Jun 2015 10:13:01 -0600
Subject: [PATCH] cfq-iosched: move group scheduling functions under ifdef

If CFQ_GROUP_IOSCHED is not set, the compiler produces the
following warning:

  CC      block/cfq-iosched.o
  linux/block/cfq-iosched.c:469:2:
    warning: 'cpd_to_cfqgd' defined but not used [-Wunused-function]
    *cpd_to_cfqgd(struct blkcg_policy_data *cpd)
     ^

In reality, two other lookup functions aren't used either if
CFQ_GROUP_IOSCHED isn't set. Move all three under one of the
CFQ_GROUP_IOSCHED sections in the code.

Reported-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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