tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: d31958b30ea3b7b6e522d6bf449427748ad45822 commit: 526fbaed33e8eac89634a676e5f8e3b41dfae66e [6663/7247] riscv: Register System RAM as iomem resources config: riscv-randconfig-r005-20200710 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu git checkout 526fbaed33e8eac89634a676e5f8e3b41dfae66e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): void __init resource_init(void) ^ arch/riscv/mm/init.c:520:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __init resource_init(void) ^ static 1 warning generated. vim +/resource_init +520 arch/riscv/mm/init.c 519 521 { 522 struct memblock_region *region; 523 524 for_each_memblock(memory, region) { 525 struct resource *res; 526 527 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 528 if (!res) 529 panic("%s: Failed to allocate %zu bytes\n", __func__, 530 sizeof(struct resource)); 531 532 if (memblock_is_nomap(region)) { 533 res->name = "reserved"; 534 res->flags = IORESOURCE_MEM; 535 } else { 536 res->name = "System RAM"; 537 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 538 } 539 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 540 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 541 542 request_resource(&iomem_resource, res); 543 } 544 } 545 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org