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 v6.18-rc6 next-20251121]
[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-mq-debugfs-factor-out-a-helper-to-register-debugfs-for-all-rq_qos/20251121-143315
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
patch link:    https://lore.kernel.org/r/20251121062829.1433332-5-yukuai%40fnnas.com
patch subject: [PATCH v2 4/9] blk-mq-debugfs: warn about possible deadlock
config: parisc-randconfig-002-20251122 (https://download.01.org/0day-ci/archive/20251122/202511220719.yaFySU2X-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251122/202511220719.yaFySU2X-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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202511220719.yaFySU2X-lkp@intel.com/ (local)

All errors (new ones prefixed by >>):

   In file included from include/linux/bug.h:5,
                    from include/linux/vfsdebug.h:5,
                    from include/linux/fs.h:5,
                    from include/linux/highmem.h:5,
                    from include/linux/bvec.h:10,
                    from include/linux/blk_types.h:10,
                    from include/linux/blkdev.h:9,
                    from block/blk-mq-debugfs.c:7:
   block/blk-mq-debugfs.c: In function 'debugfs_create_files':

quoted

block/blk-mq-debugfs.c:628:35: error: 'struct request_queue' has no member named 'blkcg_mutex'

     628 |         lockdep_assert_not_held(&q->blkcg_mutex);
         |                                   ^~
   arch/parisc/include/asm/bug.h:86:32: note: in definition of macro 'WARN_ON'
      86 |         int __ret_warn_on = !!(x);                              \
         |                                ^
   include/linux/lockdep.h:288:9: note: in expansion of macro 'lockdep_assert'
     288 |         lockdep_assert(lockdep_is_held(l) != LOCK_STATE_HELD)
         |         ^~~~~~~~~~~~~~
   include/linux/lockdep.h:288:24: note: in expansion of macro 'lockdep_is_held'
     288 |         lockdep_assert(lockdep_is_held(l) != LOCK_STATE_HELD)
         |                        ^~~~~~~~~~~~~~~
   block/blk-mq-debugfs.c:628:9: note: in expansion of macro 'lockdep_assert_not_held'
     628 |         lockdep_assert_not_held(&q->blkcg_mutex);
         |         ^~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for OF_GPIO
   Depends on [n]: GPIOLIB [=y] && OF [=n] && HAS_IOMEM [=y]
   Selected by [y]:
   - GPIO_TB10X [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && (ARC_PLAT_TB10X || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for GPIO_SYSCON
   Depends on [n]: GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF [=n]
   Selected by [y]:
   - GPIO_SAMA5D2_PIOBU [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF_GPIO [=y] && (ARCH_AT91 || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for I2C_K1
   Depends on [n]: I2C [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && OF [=n]
   Selected by [y]:
   - MFD_SPACEMIT_P1 [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && I2C [=y]


vim +628 block/blk-mq-debugfs.c

   612	
   613	static void debugfs_create_files(struct request_queue *q, struct dentry *parent,
   614					 void *data,
   615					 const struct blk_mq_debugfs_attr *attr)
   616	{
   617		/*
   618		 * Creating new debugfs entries with queue freezed has the risk of
   619		 * deadlock.
   620		 */
   621		WARN_ON_ONCE(q->mq_freeze_depth != 0);
   622		/*
   623		 * debugfs_mutex should not be nested under other locks that can be
   624		 * grabbed while queue is frozen.
   625		 */
   626		lockdep_assert_not_held(&q->elevator_lock);
   627		lockdep_assert_not_held(&q->rq_qos_mutex);
 > 628		lockdep_assert_not_held(&q->blkcg_mutex);
   629	
   630		if (IS_ERR_OR_NULL(parent))
   631			return;
   632	
   633		for (; attr->name; attr++)
   634			debugfs_create_file_aux(attr->name, attr->mode, parent,
   635					    (void *)attr, data, &blk_mq_debugfs_fops);
   636	}
   637	

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