Hi wangyigen, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: f6ce6a14f5841221e47ea0192331253223bdab2d commit: 13e5c52d7cec7621f78bce452b78785e689ed0b2 [2880/2880] cgroup_writeback: bind blkcg and memcg config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20250429/202504290538.Gt6tWC7N-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250429/202504290538.Gt6tWC7N-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/202504290538.Gt6tWC7N-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from mm/filemap.c:32:

...

include/linux/backing-dev.h:418:49: warning: 'struct cgroup_subsys' declared inside parameter list will not be visible outside of this definition or declaration 418 | static inline void bind_memcg_blkcg_link(struct cgroup_subsys *ss, | ^~~~~~~~~~~~~ mm/filemap.c:823:14: warning: no previous prototype for '__add_to_page_cache_locked' [-Wmissing-prototypes] 823 | noinline int __add_to_page_cache_locked(struct page *page, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from mm/fadvise.c:16: include/linux/backing-dev.h:418:49: warning: 'struct cgroup_subsys' declared inside parameter list will not be visible outside of this definition or declaration 418 | static inline void bind_memcg_blkcg_link(struct cgroup_subsys *ss, | ^~~~~~~~~~~~~ -- In file included from mm/page_alloc.c:50: include/linux/backing-dev.h:418:49: warning: 'struct cgroup_subsys' declared inside parameter list will not be visible outside of this definition or declaration 418 | static inline void bind_memcg_blkcg_link(struct cgroup_subsys *ss, | ^~~~~~~~~~~~~ mm/page_alloc.c:2609:5: warning: no previous prototype for 'find_suitable_fallback' [-Wmissing-prototypes] 2609 | int find_suitable_fallback(struct free_area *area, unsigned int order, | ^~~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c:3040:6: warning: no previous prototype for '__drain_all_pages' [-Wmissing-prototypes] 3040 | void __drain_all_pages(struct zone *zone, bool force_all_cpus) | ^~~~~~~~~~~~~~~~~ mm/page_alloc.c:3603:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes] 3603 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c:6753:20: warning: no previous prototype for 'memmap_init' [-Wmissing-prototypes] 6753 | void __init __weak memmap_init(void) | ^~~~~~~~~~~ mm/page_alloc.c:6791:23: warning: no previous prototype for 'arch_memmap_init' [-Wmissing-prototypes] 6791 | void __meminit __weak arch_memmap_init(unsigned long size, int nid, | ^~~~~~~~~~~~~~~~ mm/page_alloc.c:6909:6: warning: no previous prototype for '__zone_set_pageset_high_and_batch' [-Wmissing-prototypes] 6909 | void __zone_set_pageset_high_and_batch(struct zone *zone, unsigned long high, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +418 include/linux/backing-dev.h 417

418 static inline void bind_memcg_blkcg_link(struct cgroup_subsys *ss, 419 struct css_set *cset) 420 { 421 } 422

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