tree: https://github.com/intel/linux-intel-lts.git 4.19/android_r head: 072f407465e8e25a3c2c22590e1ab72ccf335151 commit: b652a52d36a85d1b731921ba08e701d7150ce200 [19120/22631] Merge branch 'aosp/android-4.19-stable' into android_r config: mips-randconfig-r031-20210409 (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://github.com/intel/linux-intel-lts/commit/b652a52d36a85d1b731921ba0... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 4.19/android_r git checkout b652a52d36a85d1b731921ba08e701d7150ce200 # 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 >>): drivers/media/media-device.c:848:9: warning: cast between incompatible function types from 'long int (*)(struct media_device *, void *)' to 'long int (*)(struct media_device *, struct file *, void *)' [-Wcast-function-type] 848 | .fn = (long (*)(struct media_device *, \ | ^ drivers/media/media-device.c:856:2: note: in expansion of macro 'MEDIA_IOC_ARG' 856 | MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user) | ^~~~~~~~~~~~~ drivers/media/media-device.c:872:2: note: in expansion of macro 'MEDIA_IOC' 872 | MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX), | ^~~~~~~~~ 848 | .fn = (long (*)(struct media_device *, \ | ^ drivers/media/media-device.c:856:2: note: in expansion of macro 'MEDIA_IOC_ARG' 856 | MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user) | ^~~~~~~~~~~~~ drivers/media/media-device.c:874:2: note: in expansion of macro 'MEDIA_IOC' 874 | MEDIA_IOC(DQEVENT, media_device_dqevent, 0), | ^~~~~~~~~ -- sound/hda/hdac_stream.c: In function 'snd_hdac_stream_setup_periods': 414 | struct snd_compr_runtime *cruntime = NULL; | ^~~~~~~~ sound/hda/hdac_stream.c:617: warning: Function parameter or member 'set' not described in 'snd_hdac_stream_sync_trigger' sound/hda/hdac_stream.c:617: warning: Function parameter or member 'reg' not described in 'snd_hdac_stream_sync_trigger' vim +848 drivers/media/media-device.c 7d4b64028c4bc8 Sakari Ailus 2016-04-27 844 7d4b64028c4bc8 Sakari Ailus 2016-04-27 845 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \ 6975264c4c6c00 Sakari Ailus 2016-05-03 846 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \ 6975264c4c6c00 Sakari Ailus 2016-05-03 847 .cmd = MEDIA_IOC_##__cmd, \ cbe0196f2e6128 Meng Wei 2018-10-26 @848 .fn = (long (*)(struct media_device *, \ cbe0196f2e6128 Meng Wei 2018-10-26 849 struct file *, void *))func, \ 7d4b64028c4bc8 Sakari Ailus 2016-04-27 850 .flags = fl, \ bcd5081b05367d Sakari Ailus 2016-05-03 851 .arg_from_user = from_user, \ bcd5081b05367d Sakari Ailus 2016-05-03 852 .arg_to_user = to_user, \ 6975264c4c6c00 Sakari Ailus 2016-05-03 853 } cf439d5f4d609b Sakari Ailus 2016-04-27 854 :::::: The code at line 848 was first introduced by commit :::::: cbe0196f2e61288e2916821cbeb3190f1c09da7e media: Add request API :::::: TO: Meng Wei <wei.meng(a)intel.com&gt; :::::: CC: Pan, Kris <kris.pan(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org