Hi Weilong, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 673b27ee13cb811b3f418669e6826b95459c32f4 commit: b498d9f1bacd40d583c0970cab02ad522127a7e7 [2459/2459] arm64/ascend: Add new enable_oom_killer interface for oom contrl config: arm64-randconfig-004-20250704 (https://download.01.org/0day-ci/archive/20250704/202507041600.4d0iiWmN-lkp@i...) compiler: aarch64-linux-gcc (GCC) 10.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250704/202507041600.4d0iiWmN-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/202507041600.4d0iiWmN-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

mm/memcontrol.c:3147:6: warning: no previous prototype for 'hisi_oom_recover' [-Wmissing-prototypes] 3147 | void hisi_oom_recover(struct obj_cgroup *objcg) | ^~~~~~~~~~~~~~~~

vim +/hisi_oom_recover +3147 mm/memcontrol.c 3145 3146 #ifdef CONFIG_ASCEND_OOM

3147 void hisi_oom_recover(struct obj_cgroup *objcg) 3148 { 3149 struct mem_cgroup *memcg; 3150 3151 memcg = get_mem_cgroup_from_objcg(objcg); 3152 if (!mem_cgroup_is_root(memcg)) 3153 memcg_oom_recover(memcg); 3154 css_put(&memcg->css); 3155 } 3156 #else 3157 static inline void hisi_oom_recover(struct obj_cgroup *objcg) { } 3158 #endif 3159

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