Hi Ze, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: c81824893b87edffa39389711d160c2dd5a03e1e commit: 621647ce254f1d347ae9bc3d328c09cbb2732487 [2304/2304] mm: support periodical memory reclaim config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20250527/202505272226.RcAmWtpx-lkp@i...) compiler: loongarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250527/202505272226.RcAmWtpx-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/202505272226.RcAmWtpx-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

mm/page_cache_limit.c:35:5: warning: no previous prototype for 'cache_reclaim_enable_handler' [-Wmissing-prototypes] 35 | int cache_reclaim_enable_handler(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/page_cache_limit.c:51:5: warning: no previous prototype for 'cache_reclaim_sysctl_handler' [-Wmissing-prototypes] 51 | int cache_reclaim_sysctl_handler(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/cache_reclaim_enable_handler +35 mm/page_cache_limit.c 34

35 int cache_reclaim_enable_handler(struct ctl_table *table, int write, 36 void *buffer, size_t *length, loff_t *ppos) 37 { 38 int ret; 39 40 ret = proc_dointvec_minmax(table, write, buffer, length, ppos); 41 if (ret || !write) 42 return ret; 43 44 if (should_periodical_reclaim()) 45 schedule_delayed_work(&shepherd, round_jiffies_relative( 46 (unsigned long)vm_cache_reclaim_s * HZ)); 47 48 return 0; 49 } 50 51 int cache_reclaim_sysctl_handler(struct ctl_table *table, int write, 52 void *buffer, size_t *length, loff_t *ppos) 53 { 54 int ret; 55 56 ret = proc_dointvec_minmax(table, write, buffer, length, ppos); 57 if (ret || !write) 58 return ret; 59 60 if (should_periodical_reclaim()) 61 mod_delayed_work(system_unbound_wq, &shepherd, 62 round_jiffies_relative( 63 (unsigned long)vm_cache_reclaim_s * HZ)); 64 65 return ret; 66 } 67

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