tree: https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-reclaimcongest-v1r4 head: 07285068a0f1fb7bee052bf5a4b71c4d8d4b2f77 commit: a7f2d5fd13a3022b3906b6f849998b726fa3eb83 [1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested config: microblaze-buildonly-randconfig-r004-20210929 (attached as .config) compiler: microblaze-linux-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://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git/commit/?id=... git remote add mel https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git git fetch --no-tags mel mm-reclaimcongest-v1r4 git checkout a7f2d5fd13a3022b3906b6f849998b726fa3eb83 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=microblaze 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 >>): mm/vmscan.c: In function 'reclaim_throttle': 1015 | long ret; | ^~~ mm/vmscan.c: In function 'demote_page_list': mm/vmscan.c:1381:13: error: variable 'err' set but not used [-Werror=unused-but-set-variable] 1381 | int err; | ^~~ cc1: all warnings being treated as errors vim +/ret +1015 mm/vmscan.c 1008 1009 static void 1010 reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason, 1011 long timeout) 1012 { 1013 wait_queue_head_t *wqh = &pgdat->reclaim_wait; 1014 unsigned long start = jiffies; 1016 DEFINE_WAIT(wait); 1017 1018 atomic_inc(&pgdat->nr_reclaim_throttled); 1019 WRITE_ONCE(pgdat->nr_reclaim_start, 1020 node_page_state(pgdat, NR_THROTTLED_WRITTEN)); 1021 1022 prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE); 1023 ret = schedule_timeout(timeout); 1024 finish_wait(wqh, &wait); 1025 atomic_dec(&pgdat->nr_reclaim_throttled); 1026 1027 trace_mm_vmscan_throttled(pgdat->node_id, jiffies_to_usecs(timeout), 1028 jiffies_to_usecs(jiffies - start), 1029 reason); 1030 } 1031 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org