Hi liubo, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 098a595b2caf96f57cda68f082b4dc0019d7814d commit: 44983705e56ab22fda801d66e2a6bd0d1be7ca0b [1327/1327] etmem: add original kernel swap enabled options config: x86_64-buildonly-randconfig-005-20241216 (https://download.01.org/0day-ci/archive/20241216/202412161417.Nk6TMs2D-lkp@i...) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241216/202412161417.Nk6TMs2D-lkp@i...) 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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202412161417.Nk6TMs2D-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from mm/vmscan.c:23: include/linux/pagemap.h:425:21: warning: cast from 'int (*)(struct file *, struct page *)' to 'filler_t *' (aka 'int (*)(void *, struct page *)') converts to incompatible function type [-Wcast-function-type-strict] 425 | filler_t *filler = (filler_t *)mapping->a_ops->readpage; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from mm/vmscan.c:33: include/linux/mm_inline.h:32:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 32 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages); | ~~~~~~~~~~~ ^ ~~~ include/linux/mm_inline.h:34:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 34 | NR_ZONE_LRU_BASE + lru, nr_pages); | ~~~~~~~~~~~~~~~~ ^ ~~~ mm/vmscan.c:350:64: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 350 | lru_size = node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru); | ~~~~~~~~~~~ ^ ~~~ include/linux/vmstat.h:240:60: note: expanded from macro 'node_page_state' 240 | #define node_page_state(node, item) global_node_page_state(item) | ^~~~ mm/vmscan.c:363:29: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 363 | NR_ZONE_LRU_BASE + lru); | ~~~~~~~~~~~~~~~~ ^ ~~~ mm/vmscan.c:1776:4: warning: arithmetic between different enumeration types ('enum vm_event_item' and 'enum zone_type') [-Wenum-enum-conversion] 1776 | __count_zid_vm_events(PGSCAN_SKIP, zid, nr_skipped[zid]); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:127:34: note: expanded from macro '__count_zid_vm_events' 127 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta) | ~~~~~~~~~~~~~ ^ ~~~~~~~~~~~ mm/vmscan.c:2734:17: warning: variable 'node_lru_pages' set but not used [-Wunused-but-set-variable] 2734 | unsigned long node_lru_pages = 0; | ^ mm/vmscan.c:3066:3: warning: arithmetic between different enumeration types ('enum vm_event_item' and 'enum zone_type') [-Wenum-enum-conversion] 3066 | __count_zid_vm_events(ALLOCSTALL, sc->reclaim_idx, 1); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:127:34: note: expanded from macro '__count_zid_vm_events' 127 | __count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta) | ~~~~~~~~~~~~~ ^ ~~~~~~~~~~~

...

mm/vmscan.c:3257:21: error: implicit declaration of function 'kernel_swap_enabled' [-Werror,-Wimplicit-function-declaration] 3257 | if (sc != NULL && !kernel_swap_enabled()) | ^ mm/vmscan.c:3257:21: note: did you mean 'kernfs_ns_enabled'? include/linux/kernfs.h:309:20: note: 'kernfs_ns_enabled' declared here 309 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) | ^ 8 warnings and 1 error generated.

vim +/kernel_swap_enabled +3257 mm/vmscan.c 3250 3251 /* 3252 * Check if original kernel swap is enabled 3253 * turn off kernel swap,but leave page cache reclaim on 3254 */ 3255 static inline void kernel_swap_check(struct scan_control *sc) 3256 {

3257 if (sc != NULL && !kernel_swap_enabled()) 3258 sc->may_swap = 0; 3259 } 3260

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