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Date:   Thu, 17 Dec 2020 10:16:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: 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/?id=518b466a21ad7fa1e338fa4ed9d180ef439d3bc0
        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@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/pinctrl/ralink/pinctrl-rt2880.c:365:12: warning: no previous prototype for 'rt2880_pinmux_init' [-Wmissing-prototypes]
     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@...il.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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