Hi Zhuling, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: bef6f06e039b8929481350d15d6d8c3ba81c6fd2 commit: db4cd75bc674e6f473c0a7303b1744155352882c [4701/30000] arm64: register persistent memory via protected memory config: arm64-randconfig-004-20240928 (https://download.01.org/0day-ci/archive/20240928/202409280935.BxmRiHdQ-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240928/202409280935.BxmRiHdQ-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/202409280935.BxmRiHdQ-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

arch/arm64/mm/pmem_reserve.c:13:13: warning: no previous prototype for 'setup_reserve_pmem' [-Wmissing-prototypes] 13 | void __init setup_reserve_pmem(u64 start, u64 size) | ^~~~~~~~~~~~~~~~~~ arch/arm64/mm/pmem_reserve.c:25:13: warning: no previous prototype for 'request_pmem_res_resource' [-Wmissing-prototypes] 25 | void __init request_pmem_res_resource(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/mm/pmem_reserve.c:40:13: warning: no previous prototype for 'reserve_pmem' [-Wmissing-prototypes] 40 | void __init reserve_pmem(void) | ^~~~~~~~~~~~

vim +/setup_reserve_pmem +13 arch/arm64/mm/pmem_reserve.c 12

13 void __init setup_reserve_pmem(u64 start, u64 size) 14 { 15 if (pmem_res_cnt >= MAX_REGIONS) { 16 pr_err("protected memory regions above upper limit %d\n", MAX_REGIONS); 17 return; 18 } 19 20 pmem_res[pmem_res_cnt].start = start; 21 pmem_res[pmem_res_cnt].end = start + size - 1; 22 pmem_res_cnt++; 23 } 24 25 void __init request_pmem_res_resource(void) 26 { 27 struct resource *res; 28 int i; 29 30 for (i = 0; i < pmem_res_cnt; i++) { 31 res = &pmem_res[i]; 32 res->name = "Persistent Memory (legacy)"; 33 res->flags = IORESOURCE_MEM; 34 res->desc = IORES_DESC_PERSISTENT_MEMORY_LEGACY; 35 if (res->start && res->end) 36 request_resource(&iomem_resource, res); 37 } 38 } 39 40 void __init reserve_pmem(void)

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