Hi Michal,

kernel test robot noticed the following build errors:

[auto build test ERROR on 8f0b4cce4481fb22653697cced8d0d04027cb1e8]

url:    https://github.com/intel-lab-lkp/linux/commits/Michal-Koutn/cgroup-Eliminate-cgrp_ancestor_storage-in-cgroup_root/20251218-004346
base:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
patch link:    https://lore.kernel.org/r/20251217162744.352391-3-mkoutny%40suse.com
patch subject: [PATCH 2/4] cgroup: Introduce cgroup_level() helper
config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20251221/202512210532.ziNaxDJf-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512210532.ziNaxDJf-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/202512210532.ziNaxDJf-lkp@intel.com/ (local)

All error/warnings (new ones prefixed by >>):

   block/blk-iocost.c: In function 'ioc_pd_init':

quoted

block/blk-iocost.c:3006:60: error: expected ';' before 'for'

    3006 |         iocg->level = cgroup_level(blkg->blkcg->css.cgroup)
         |                                                            ^
         |                                                            ;
    3007 | 
    3008 |         for (tblkg = blkg; tblkg; tblkg = tblkg->parent) {
         |         ~~~                                                 

quoted

block/blk-iocost.c:2988:26: warning: unused variable 'tblkg' [-Wunused-variable]

    2988 |         struct blkcg_gq *tblkg;
         |                          ^~~~~


vim +3006 block/blk-iocost.c

  2981	
  2982	static void ioc_pd_init(struct blkg_policy_data *pd)
  2983	{
  2984		struct ioc_gq *iocg = pd_to_iocg(pd);
  2985		struct blkcg_gq *blkg = pd_to_blkg(&iocg->pd);
  2986		struct ioc *ioc = q_to_ioc(blkg->q);
  2987		struct ioc_now now;

2988		struct blkcg_gq *tblkg;

  2989		unsigned long flags;
  2990	
  2991		ioc_now(ioc, &now);
  2992	
  2993		iocg->ioc = ioc;
  2994		atomic64_set(&iocg->vtime, now.vnow);
  2995		atomic64_set(&iocg->done_vtime, now.vnow);
  2996		atomic64_set(&iocg->active_period, atomic64_read(&ioc->cur_period));
  2997		INIT_LIST_HEAD(&iocg->active_list);
  2998		INIT_LIST_HEAD(&iocg->walk_list);
  2999		INIT_LIST_HEAD(&iocg->surplus_list);
  3000		iocg->hweight_active = WEIGHT_ONE;
  3001		iocg->hweight_inuse = WEIGHT_ONE;
  3002	
  3003		init_waitqueue_head(&iocg->waitq);
  3004		hrtimer_setup(&iocg->waitq_timer, iocg_waitq_timer_fn, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
  3005	

3006		iocg->level = cgroup_level(blkg->blkcg->css.cgroup)

  3007	
  3008		for (tblkg = blkg; tblkg; tblkg = tblkg->parent) {
  3009			struct ioc_gq *tiocg = blkg_to_iocg(tblkg);
  3010			iocg->ancestors[tiocg->level] = tiocg;
  3011		}
  3012	
  3013		spin_lock_irqsave(&ioc->lock, flags);
  3014		weight_updated(iocg, &now);
  3015		spin_unlock_irqrestore(&ioc->lock, flags);
  3016	}
  3017	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki