Messages in this thread | | | Date | Sat, 2 Oct 2021 06:56:11 +0800 | From | kernel test robot <> | Subject | [mel:mm-reclaimcongest-v3r2 1/8] mm/vmscan.c:1015:14: error: variable 'ret' set but not used |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-reclaimcongest-v3r2 head: 569ddfc76b8072398fe4021d3a85538396351872 commit: e4aac9cc07de215558db298f6a55a9a7236273c5 [1/8] mm/vmscan: Throttle reclaim until some writeback completes if congested config: s390-allyesconfig (attached as .config) compiler: s390-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=e4aac9cc07de215558db298f6a55a9a7236273c5 git remote add mel https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git git fetch --no-tags mel mm-reclaimcongest-v3r2 git checkout e4aac9cc07de215558db298f6a55a9a7236273c5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
mm/vmscan.c: In function 'reclaim_throttle': >> mm/vmscan.c:1015:14: error: variable 'ret' set but not used [-Werror=unused-but-set-variable] 1015 | long ret; | ^~~ mm/vmscan.c: In function 'demote_page_list': mm/vmscan.c:1382:13: error: variable 'err' set but not used [-Werror=unused-but-set-variable] 1382 | 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; > 1015 long ret; 1016 DEFINE_WAIT(wait); 1017 1018 if (atomic_inc_return(&pgdat->nr_reclaim_throttled) == 1) { 1019 WRITE_ONCE(pgdat->nr_reclaim_start, 1020 node_page_state(pgdat, NR_THROTTLED_WRITTEN)); 1021 } 1022 1023 prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); 1024 ret = schedule_timeout(timeout); 1025 finish_wait(wqh, &wait); 1026 atomic_dec(&pgdat->nr_reclaim_throttled); 1027 1028 trace_mm_vmscan_throttled(pgdat->node_id, jiffies_to_usecs(timeout), 1029 jiffies_to_usecs(jiffies - start), 1030 reason); 1031 } 1032
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