linux-kernel - Re: [PATCH] block: Make rescuer threads per request

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Date:   Wed, 8 Feb 2017 14:23:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Kent Overstreet <kent.overstreet@...il.com>
Cc:     kbuild-all@...org, Pavel Machek <pavel@....cz>,
        Mike Snitzer <snitzer@...hat.com>,
        kernel list <linux-kernel@...r.kernel.org>, axboe@...com,
        hch@....de, neilb@...e.de, martin.petersen@...cle.com,
        dpark@...teo.net, ming.l@....samsung.com, dm-devel@...hat.com,
        ming.lei@...onical.com, agk@...hat.com, jkosina@...e.cz,
        geoff@...radead.org, jim@...n.com, pjk1939@...ux.vnet.ibm.com,
        minchan@...nel.org, ngupta@...are.org, oleg.drokin@...el.com,
        andreas.dilger@...el.com
Subject: Re: [PATCH] block: Make rescuer threads per request_queue, not per
 bioset

Hi Kent,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.10-rc7]
[cannot apply to next-20170207]
[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/Kent-Overstreet/block-Make-rescuer-threads-per-request_queue-not-per-bioset/20170208-130414
config: x86_64-randconfig-x017-201706 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/uapi/linux/capability.h:16,
                    from include/linux/capability.h:15,
                    from include/linux/sched.h:15,
                    from include/linux/kasan.h:4,
                    from kernel/sched/core.c:29:
   kernel/sched/core.c: In function 'sched_submit_work':
   kernel/sched/core.c:3445:7: error: implicit declaration of function 'bio_list_empty' [-Werror=implicit-function-declaration]
         !bio_list_empty(&tsk->bio_list->bios) &&
          ^
   include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> kernel/sched/core.c:3444:2: note: in expansion of macro 'if'
     if (tsk->bio_list &&
     ^~
   kernel/sched/core.c:3445:36: error: dereferencing pointer to incomplete type 'struct bio_plug_list'
         !bio_list_empty(&tsk->bio_list->bios) &&
                                       ^
   include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> kernel/sched/core.c:3444:2: note: in expansion of macro 'if'
     if (tsk->bio_list &&
     ^~
   kernel/sched/core.c:3447:3: error: implicit declaration of function 'blk_punt_blocked_bios' [-Werror=implicit-function-declaration]
      blk_punt_blocked_bios(tsk->bio_list);
      ^~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/if +3444 kernel/sched/core.c

  3428	
  3429		/* causes final put_task_struct in finish_task_switch(). */
  3430		__set_current_state(TASK_DEAD);
  3431		current->flags |= PF_NOFREEZE;	/* tell freezer to ignore us */
  3432		__schedule(false);
  3433		BUG();
  3434		/* Avoid "noreturn function does return".  */
  3435		for (;;)
  3436			cpu_relax();	/* For when BUG is null */
  3437	}
  3438	
  3439	static inline void sched_submit_work(struct task_struct *tsk)
  3440	{
  3441		if (!tsk->state || tsk_is_pi_blocked(tsk))
  3442			return;
  3443	
> 3444		if (tsk->bio_list &&
  3445		    !bio_list_empty(&tsk->bio_list->bios) &&
  3446		    tsk->bio_list->q->rescue_workqueue)
  3447			blk_punt_blocked_bios(tsk->bio_list);
  3448	
  3449		/*
  3450		 * If we are going to sleep and we have plugged IO queued,
  3451		 * make sure to submit it to avoid deadlocks.
  3452		 */

---
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