Hi Yu, Thank you for the patch! Yet something to improve: [auto build test ERROR on axboe-block/for-next] [also build test ERROR on v5.15-rc5 next-20211013] [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] url: https://github.com/0day-ci/linux/commits/Yu-Kuai/optimize-the-bfq-queue-i... base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next config: arc-randconfig-r043-20211013 (attached as .config) compiler: arc-elf-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/59e859f9efae59f2fb2a850b44953800e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Yu-Kuai/optimize-the-bfq-queue-idle-judgment/20211013-191413 git checkout 59e859f9efae59f2fb2a850b44953800e06f5eb0 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash block/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 981 | #define bfq_update_groups_with_pending_reqs(struct bfq_entity *entity) \ | ^~~~~~~~~~ block/bfq-wf2q.c: In function '__bfq_activate_entity': 1038 | bfq_update_groups_with_pending_reqs(entity); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +981 block/bfq-wf2q.c 958 959 static void bfq_update_groups_with_pending_reqs(struct bfq_entity *entity) 960 { 961 struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 962 963 if (bfqq) { 964 /* 965 * If the entity represents bfq_queue, and the queue belongs to 966 * root cgroup. 967 */ 968 if (!entity->parent) 969 bfq_set_group_with_pending_reqs(bfqq->bfqd, 970 &bfqq->bfqd->root_group->entity); 971 } else { 972 /* If the entity represents bfq_group. */ 973 struct bfq_group *bfqg = 974 container_of(entity, struct bfq_group, entity); 975 struct bfq_data *bfqd = bfqg->bfqd; 976 977 bfq_set_group_with_pending_reqs(bfqd, entity); 978 } 979 } 980 #else 982 do {} while (0) 983 #endif 984 985 /** 986 * __bfq_activate_entity - handle activation of entity. 987 * @entity: the entity being activated. 988 * @non_blocking_wait_rq: true if entity was waiting for a request 989 * 990 * Called for a 'true' activation, i.e., if entity is not active and 991 * one of its children receives a new request. 992 * 993 * Basically, this function updates the timestamps of entity and 994 * inserts entity into its active tree, after possibly extracting it 995 * from its idle tree. 996 */ 997 static void __bfq_activate_entity(struct bfq_entity *entity, 998 bool non_blocking_wait_rq) 999 { 1000 struct bfq_service_tree *st = bfq_entity_service_tree(entity); 1001 bool backshifted = false; 1002 unsigned long long min_vstart; 1003 1004 /* See comments on bfq_fqq_update_budg_for_activation */ 1005 if (non_blocking_wait_rq && bfq_gt(st->vtime, entity->finish)) { 1006 backshifted = true; 1007 min_vstart = entity->finish; 1008 } else 1009 min_vstart = st->vtime; 1010 1011 if (entity->tree == &st->idle) { 1012 /* 1013 * Must be on the idle tree, bfq_idle_extract() will 1014 * check for that. 1015 */ 1016 bfq_idle_extract(st, entity); 1017 entity->start = bfq_gt(min_vstart, entity->finish) ? 1018 min_vstart : entity->finish; 1019 } else { 1020 /* 1021 * The finish time of the entity may be invalid, and 1022 * it is in the past for sure, otherwise the queue 1023 * would have been on the idle tree. 1024 */ 1025 entity->start = min_vstart; 1026 st->wsum += entity->weight; 1027 /* 1028 * entity is about to be inserted into a service tree, 1029 * and then set in service: get a reference to make 1030 * sure entity does not disappear until it is no 1031 * longer in service or scheduled for service. 1032 */ 1033 bfq_get_entity(entity); 1034 1035 entity->on_st_or_in_serv = true; 1036 } 1037 1039 bfq_update_fin_time_enqueue(entity, st, backshifted); 1040 } 1041 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org