linux-kernel - Re: [PATCH v2 2/7] bfq: protect q->blkg_list iteration in bfq_end_wr_async() with blkcg

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Message-Id: <6fa416ae-7fb4-42b4-98e9-1a6a434baf3f@fnnas.com>
Date: Tue, 3 Feb 2026 21:07:52 +0800
From: "Yu Kuai" <yukuai@...as.com>
To: "kernel test robot" <lkp@...el.com>, <tj@...nel.org>, 
	<josef@...icpanda.com>, <axboe@...nel.dk>
Cc: <oe-kbuild-all@...ts.linux.dev>, <cgroups@...r.kernel.org>, 
	<linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>, 
	<zhengqixing@...wei.com>, <mkoutny@...e.com>, <hch@...radead.org>, 
	<ming.lei@...hat.com>, <nilay@...ux.ibm.com>, <yukuai@...as.com>
Subject: Re: [PATCH v2 2/7] bfq: protect q->blkg_list iteration in bfq_end_wr_async() with blkcg_mutex

Hi,

在 2026/2/3 20:54, kernel test robot 写道:
> Hi Yu,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on axboe/for-next]
> [also build test ERROR on linus/master v6.19-rc8 next-20260202]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/blk-cgroup-protect-q-blkg_list-iteration-in-blkg_destroy_all-with-blkcg_mutex/20260203-161356
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
> patch link:    https://lore.kernel.org/r/20260203080602.726505-3-yukuai%40fnnas.com
> patch subject: [PATCH v2 2/7] bfq: protect q->blkg_list iteration in bfq_end_wr_async() with blkcg_mutex
> config: i386-buildonly-randconfig-002-20260203 (https://download.01.org/0day-ci/archive/20260203/202602032018.BRG7c7LT-lkp@intel.com/config)
> compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260203/202602032018.BRG7c7LT-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202602032018.BRG7c7LT-lkp@intel.com/

Looks like this is due to CONFIG_BLK_CGROUP is disabled, will fix this in the next
version.

>
> All errors (new ones prefixed by >>):
>
>     In file included from include/linux/seqlock.h:19,
>                      from include/linux/mmzone.h:17,
>                      from include/linux/gfp.h:7,
>                      from include/linux/umh.h:4,
>                      from include/linux/kmod.h:9,
>                      from include/linux/module.h:18,
>                      from block/bfq-iosched.c:116:
>     block/bfq-iosched.c: In function 'bfq_end_wr':
>>> block/bfq-iosched.c:2648:32: error: 'struct request_queue' has no member named 'blkcg_mutex'
>      2648 |         mutex_lock(&bfqd->queue->blkcg_mutex);
>           |                                ^~
>     include/linux/mutex.h:193:44: note: in definition of macro 'mutex_lock'
>       193 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
>           |                                            ^~~~
>     block/bfq-iosched.c:2660:34: error: 'struct request_queue' has no member named 'blkcg_mutex'
>      2660 |         mutex_unlock(&bfqd->queue->blkcg_mutex);
>           |                                  ^~
>
>
> vim +2648 block/bfq-iosched.c
>
>    2642	
>    2643	static void bfq_end_wr(struct bfq_data *bfqd)
>    2644	{
>    2645		struct bfq_queue *bfqq;
>    2646		int i;
>    2647	
>> 2648		mutex_lock(&bfqd->queue->blkcg_mutex);
>    2649		spin_lock_irq(&bfqd->lock);
>    2650	
>    2651		for (i = 0; i < bfqd->num_actuators; i++) {
>    2652			list_for_each_entry(bfqq, &bfqd->active_list[i], bfqq_list)
>    2653				bfq_bfqq_end_wr(bfqq);
>    2654		}
>    2655		list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list)
>    2656			bfq_bfqq_end_wr(bfqq);
>    2657		bfq_end_wr_async(bfqd);
>    2658	
>    2659		spin_unlock_irq(&bfqd->lock);
>    2660		mutex_unlock(&bfqd->queue->blkcg_mutex);
>    2661	}
>    2662	
>
-- 
Thansk,
Kuai