[kbuild-all] arch/mips/loongson2ef/lemote-2f/machtype.c:10:13: warning: no previous prototype for 'mach_prom_init_machtype'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f78d76e72a4671ea52d12752d92077788b4f5d50 commit: b13812ddea615b6507beef24f76540c0c1143c5c MIPS: Loongson2ef: Disable Loongson MMI instructions date: 6 months ago config: mips-randconfig-r004-20210312 (attached as .config) compiler: mips64el-linux-gcc (GCC) 9.3.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b13812ddea615b6507beef24f76540c0c1143c5c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): 10 | void __init mach_prom_init_machtype(void) | ^~~~~~~~~~~~~~~~~~~~~~~ -- 52 | void setup_wakeup_events(void) | ^~~~~~~~~~~~~~~~~~~ 90 | int wakeup_loongson(void) | ^~~~~~~~~~~~~~~ 137 | void __weak mach_suspend(void) | ^~~~~~~~~~~~ 142 | void __weak mach_resume(void) | ^~~~~~~~~~~ -- 15 | void pci_ide_write_reg(int reg, u32 value) | ^~~~~~~~~~~~~~~~~ 96 | u32 pci_ide_read_reg(int reg) | ^~~~~~~~~~~~~~~~ -- 15 | void pci_acc_write_reg(int reg, u32 value) | ^~~~~~~~~~~~~~~~~ 62 | u32 pci_acc_read_reg(int reg) | ^~~~~~~~~~~~~~~~ -- 15 | void pci_ohci_write_reg(int reg, u32 value) | ^~~~~~~~~~~~~~~~~~ 70 | u32 pci_ohci_read_reg(int reg) | ^~~~~~~~~~~~~~~~~ -- 84 | void pci_isa_write_bar(int n, u32 value) | ^~~~~~~~~~~~~~~~~ 110 | u32 pci_isa_read_bar(int n) | ^~~~~~~~~~~~~~~~ 134 | void pci_isa_write_reg(int reg, u32 value) | ^~~~~~~~~~~~~~~~~ 228 | u32 pci_isa_read_reg(int reg) | ^~~~~~~~~~~~~~~~ -- 15 | void pci_ehci_write_reg(int reg, u32 value) | ^~~~~~~~~~~~~~~~~~ 75 | u32 pci_ehci_read_reg(int reg) | ^~~~~~~~~~~~~~~~~ vim +/mach_prom_init_machtype +10 arch/mips/loongson2ef/lemote-2f/machtype.c 1b39a0bad50779 arch/mips/loongson/lemote-2f/machtype.c Wu Zhangjin 2010-01-04 9 1b39a0bad50779 arch/mips/loongson/lemote-2f/machtype.c Wu Zhangjin 2010-01-04 @10 void __init mach_prom_init_machtype(void) :::::: The code at line 10 was first introduced by commit :::::: 1b39a0bad50779177ebca818c6c3380463bfca7d MIPS: Loongson: Lemote-2F: Get the machine type from PMON_VER :::::: TO: Wu Zhangjin <wuzhangjin(a)gmail.com&gt; :::::: CC: Ralf Baechle <ralf(a)linux-mips.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org