linux-kernel - Re: [PATCH 7/8] mq-deadline: add blk-mq adaptation of the deadline IO scheduler

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Message-ID: <705f3ab2-5829-1d30-20ea-dc167cca6582@fb.com>
Date:   Wed, 21 Dec 2016 07:22:37 -0700
From:   Jens Axboe <axboe@...com>
To:     Bart Van Assche <Bart.VanAssche@...disk.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "osandov@...com" <osandov@...com>,
        "paolo.valente@...aro.org" <paolo.valente@...aro.org>
Subject: Re: [PATCH 7/8] mq-deadline: add blk-mq adaptation of the deadline IO
 scheduler

On 12/21/2016 04:59 AM, Bart Van Assche wrote:
> Since this patch is the first patch that introduces a call to
> blk_queue_exit() from a module other than the block layer core,
> shouldn't this patch export the blk_queue_exit() function? An attempt
> to build mq-deadline as a module resulted in the following:
> 
> ERROR: "blk_queue_exit" [block/mq-deadline.ko] undefined!
> make[1]: *** [scripts/Makefile.modpost:91: __modpost] Error 1
> make: *** [Makefile:1198: modules] Error 2
> Execution failed: make all

Yes, it should. I'll make the export for now, I want to move that check
and free/drop into the generic code so that the schedulers don't have to
worry about it.

-- 
Jens Axboe