[kbuild-all] drivers/pinctrl/ralink/pinctrl-rt2880.c:365:12: warning: no previous prototype for 'rt2880_pinmux_init'

Hi Sergio, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: accefff5b547a9a1d959c7e76ad539bf2480e78b commit: 518b466a21ad7fa1e338fa4ed9d180ef439d3bc0 pinctrl: ralink: add a pinctrl driver for the rt2880 family date: 9 days ago config: mips-randconfig-r025-20201217 (attached as .config) compiler: mipsel-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 518b466a21ad7fa1e338fa4ed9d180ef439d3bc0 # 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 >>): 365 | int __init rt2880_pinmux_init(void) | ^~~~~~~~~~~~~~~~~~ vim +/rt2880_pinmux_init +365 drivers/pinctrl/ralink/pinctrl-rt2880.c 0317d60de869786 drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c John Crispin 2018-03-15 364 1d2d116a93f0e9b drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c Sergio Paracuellos 2018-07-09 @365 int __init rt2880_pinmux_init(void) 1d2d116a93f0e9b drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c Sergio Paracuellos 2018-07-09 366 { 1d2d116a93f0e9b drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c Sergio Paracuellos 2018-07-09 367 return platform_driver_register(&rt2880_pinmux_driver); 1d2d116a93f0e9b drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c Sergio Paracuellos 2018-07-09 368 } 1d2d116a93f0e9b drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c Sergio Paracuellos 2018-07-09 369 :::::: The code at line 365 was first introduced by commit :::::: 1d2d116a93f0e9bf0bca72da76a96edef8a1d36d Revert "staging: mt7621-pinctrl: replace core_initcall_sync with builtin_platform_driver" :::::: TO: Sergio Paracuellos <sergio.paracuellos(a)gmail.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org