linux-kernel - Re: [PATCH] blk-cgroup: remove entries in blkg

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Date:   Sat, 7 Apr 2018 05:41:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alexandru Moise <00moses.alexander00@...il.com>
Cc:     kbuild-all@...org, axboe@...nel.dk, tj@...nel.org, shli@...com,
        pombredanne@...b.com, gregkh@...uxfoundation.org,
        joseph.qi@...ux.alibaba.com, nborisov@...e.com, arnd@...db.de,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-cgroup: remove entries in blkg_tree before queue
 release

Hi Alexandru,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on block/for-next]
[also build test ERROR on v4.16 next-20180406]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Alexandru-Moise/blk-cgroup-remove-entries-in-blkg_tree-before-queue-release/20180407-035957
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: x86_64-randconfig-x001-201813 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   block/blk-sysfs.c: In function '__blk_release_queue':
>> block/blk-sysfs.c:820:2: error: implicit declaration of function 'blkg_destroy_all'; did you mean 'blk_stat_add'? [-Werror=implicit-function-declaration]
     blkg_destroy_all(q);
     ^~~~~~~~~~~~~~~~
     blk_stat_add
   cc1: some warnings being treated as errors

vim +820 block/blk-sysfs.c

   770	
   771	/**
   772	 * __blk_release_queue - release a request queue when it is no longer needed
   773	 * @work: pointer to the release_work member of the request queue to be released
   774	 *
   775	 * Description:
   776	 *     blk_release_queue is the counterpart of blk_init_queue(). It should be
   777	 *     called when a request queue is being released; typically when a block
   778	 *     device is being de-registered. Its primary task it to free the queue
   779	 *     itself.
   780	 *
   781	 * Notes:
   782	 *     The low level driver must have finished any outstanding requests first
   783	 *     via blk_cleanup_queue().
   784	 *
   785	 *     Although blk_release_queue() may be called with preemption disabled,
   786	 *     __blk_release_queue() may sleep.
   787	 */
   788	static void __blk_release_queue(struct work_struct *work)
   789	{
   790		struct request_queue *q = container_of(work, typeof(*q), release_work);
   791	
   792		if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags))
   793			blk_stat_remove_callback(q, q->poll_cb);
   794		blk_stat_free_callback(q->poll_cb);
   795	
   796		blk_free_queue_stats(q->stats);
   797	
   798		blk_exit_rl(q, &q->root_rl);
   799	
   800		if (q->queue_tags)
   801			__blk_queue_free_tags(q);
   802	
   803		if (!q->mq_ops) {
   804			if (q->exit_rq_fn)
   805				q->exit_rq_fn(q, q->fq->flush_rq);
   806			blk_free_flush_queue(q->fq);
   807		} else {
   808			blk_mq_release(q);
   809		}
   810	
   811		blk_trace_shutdown(q);
   812	
   813		if (q->mq_ops)
   814			blk_mq_debugfs_unregister(q);
   815	
   816		if (q->bio_split)
   817			bioset_free(q->bio_split);
   818	
   819		spin_lock_irq(q->queue_lock);
 > 820		blkg_destroy_all(q);
   821		spin_unlock_irq(q->queue_lock);
   822	
   823		ida_simple_remove(&blk_queue_ida, q->id);
   824		call_rcu(&q->rcu_head, blk_free_queue_rcu);
   825	}
   826	

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