Hi Huan, kernel test robot noticed the following build warnings: [auto build test WARNING on akpm-mm/mm-everything] [also build test WARNING on tj-cgroup/for-next linus/master v6.6 next-20231108] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Huan-Yang/mm-vmscan-LRU-unbalance-cgroup-reclaim/20231108-151757 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20231108065818.19932-3-link%40vivo.com patch subject: [PATCH 2/4] mm: multi-gen LRU: MGLRU unbalance reclaim config: x86_64-randconfig-011-20231108 (https://download.01.org/0day-ci/archive/20231108/202311082048.zacOzITP-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231108/202311082048.zacOzITP-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202311082048.zacOzITP-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): mm/vmscan.c: In function 'isolate_folios': >> mm/vmscan.c:4518:29: warning: 'unbalance' is used uninitialized [-Wuninitialized] 4518 | if (scanned || unbalance) | ~~~~~~~~^~~~~~~~~~~~ mm/vmscan.c:4488:14: note: 'unbalance' was declared here 4488 | bool unbalance; | ^~~~~~~~~ vim +/unbalance +4518 mm/vmscan.c 4480 4481 static int isolate_folios(struct lruvec *lruvec, struct scan_control *sc, int swappiness, 4482 int *type_scanned, struct list_head *list) 4483 { 4484 int i; 4485 int type; 4486 int scanned; 4487 int tier = -1; 4488 bool unbalance; 4489 DEFINE_MIN_SEQ(lruvec); 4490 4491 /* 4492 * Try to make the obvious choice first. When anon and file are both 4493 * available from the same generation, interpret swappiness 1 as file 4494 * first and 200 as anon first. 4495 */ 4496 if (unlikely(unbalance_file_reclaim(sc, swappiness))) { 4497 unbalance = true; 4498 type = LRU_GEN_FILE; 4499 } else if (unlikely(unbalance_anon_reclaim(sc, swappiness))) { 4500 unbalance = true; 4501 type = LRU_GEN_ANON; 4502 } else if (!swappiness) 4503 type = LRU_GEN_FILE; 4504 else if (min_seq[LRU_GEN_ANON] < min_seq[LRU_GEN_FILE]) 4505 type = LRU_GEN_ANON; 4506 else if (swappiness == 1) 4507 type = LRU_GEN_FILE; 4508 else if (swappiness == 200) 4509 type = LRU_GEN_ANON; 4510 else 4511 type = get_type_to_scan(lruvec, swappiness, &tier); 4512 4513 for (i = !swappiness; i < ANON_AND_FILE; i++) { 4514 if (tier < 0) 4515 tier = get_tier_idx(lruvec, type); 4516 4517 scanned = scan_folios(lruvec, sc, type, tier, list); > 4518 if (scanned || unbalance) 4519 break; 4520 4521 type = !type; 4522 tier = -1; 4523 } 4524 4525 *type_scanned = type; 4526 4527 return scanned; 4528 } 4529 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
