Hi "Wang, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on v5.17-rc4] [also build test WARNING on next-20220216] [cannot apply to axboe-block/for-next] [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/Wang-Jianchao-Kuaishou/blk-make-... base: 754e0b0e35608ed5206d6a67a791563c631cec07 config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220216/202202162159.aWo1ROMf-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/e486fdca8e0e257a237ae001ff5759e4a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Wang-Jianchao-Kuaishou/blk-make-blk-rq-qos-policies-pluggable-and-modular/20220216-195026 git checkout e486fdca8e0e257a237ae001ff5759e4a06ae114 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 516 | int rq_qos_switch(struct request_queue *q, | ^~~~~~~~~~~~~ vim +/rq_qos_switch +516 block/blk-rq-qos.c 515 517 const struct rq_qos_ops *ops, 518 struct rq_qos *rqos) 519 { 520 int ret; 521 522 blk_mq_freeze_queue(q); 523 if (!rqos) { 524 ret = ops->init(q); 525 } else { 526 ops->exit(rqos); 527 ret = 0; 528 } 529 blk_mq_unfreeze_queue(q); 530 531 return ret; 532 } 533 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org