Hi Emmanuel, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mac80211-next/master] [also build test WARNING on mac80211/master v5.13-rc6 next-20210616] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Emmanuel-Grumbach/cfg80211-expos... base: https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git master config: arm-imx_v6_v7_defconfig (attached as .config) compiler: arm-linux-gnueabi-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://github.com/0day-ci/linux/commit/8b25a459eed15aebc25c2ce0a5bf20fea... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Emmanuel-Grumbach/cfg80211-expose-the-rfkill-device-to-the-low-level-driver/20210616-211511 git checkout 8b25a459eed15aebc25c2ce0a5bf20fea8eab638 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): In file included from net/wireless/core.c:26: include/net/cfg80211.h: In function 'wiphy_rfkill_stop_polling': include/net/cfg80211.h:6669:2: error: implicit declaration of function 'rfkill_pause_polling' [-Werror=implicit-function-declaration] 6669 | rfkill_pause_polling(wiphy->rfkill); | ^~~~~~~~~~~~~~~~~~~~ In file included from net/wireless/core.h:14, from net/wireless/nl80211.h:9, from net/wireless/core.c:27: include/linux/rfkill.h: At top level: 110 | void rfkill_pause_polling(struct rfkill *rfkill); | ^~~~~~~~~~~~~~~~~~~~ In file included from net/wireless/core.c:26: include/net/cfg80211.h:6669:2: note: previous implicit declaration of 'rfkill_pause_polling' was here 6669 | rfkill_pause_polling(wiphy->rfkill); | ^~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/rfkill_pause_polling +110 include/linux/rfkill.h 135900c182c321 Michael Buesch 2007-09-27 101 19d337dff95cbf Johannes Berg 2009-06-02 102 /** 19d337dff95cbf Johannes Berg 2009-06-02 103 * rfkill_pause_polling(struct rfkill *rfkill) 19d337dff95cbf Johannes Berg 2009-06-02 104 * 19d337dff95cbf Johannes Berg 2009-06-02 105 * Pause polling -- say transmitter is off for other reasons. 19d337dff95cbf Johannes Berg 2009-06-02 106 * NOTE: not necessary for suspend/resume -- in that case the dd21dfc645d5dc Johannes Berg 2016-01-20 107 * core stops polling anyway (but will also correctly handle dd21dfc645d5dc Johannes Berg 2016-01-20 108 * the case of polling having been paused before suspend.) 19d337dff95cbf Johannes Berg 2009-06-02 109 */ 19d337dff95cbf Johannes Berg 2009-06-02 @110 void rfkill_pause_polling(struct rfkill *rfkill); cf4328cd949c20 Ivo van Doorn 2007-05-07 111 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org