On 06/18/2015 04:33 PM, Vladimir Zapolskiy wrote:
If CFQ_GROUP_IOSCHED kernel option is not set, a 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)
      ^

Define this function only if CFQ_GROUP_IOSCHED is set and remove
the compilation warning.

The two other related functions aren't used either if group scheduling isn't enabled. I committed this instead:

http://git.kernel.dk/cgit/linux-block/commit/?h=for-4.2/core&id=4ceab71b9d84e55b59a76b54b2999dc377aae6e6

--
Jens Axboe

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