Hi Tomas, I love your patch! Yet something to improve: [auto build test ERROR on ljones-mfd/for-mfd-next] [also build test ERROR on v5.7-rc5 next-20200515] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Tomas-Winkler/mfd-constify-point... base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next config: arm-randconfig-r006-20200515 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 13d44b2a0c7ef404b13b16644765977cd5310fe2) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): struct hid_sensor_hub_device *hsdev = ^ 1 error generated. vim +738 drivers/hid/hid-sensor-hub.c 401ca24fb34aee0 srinivas pandruvada 2012-09-05 726 401ca24fb34aee0 srinivas pandruvada 2012-09-05 727 static void sensor_hub_remove(struct hid_device *hdev) 401ca24fb34aee0 srinivas pandruvada 2012-09-05 728 { 401ca24fb34aee0 srinivas pandruvada 2012-09-05 729 struct sensor_hub_data *data = hid_get_drvdata(hdev); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 730 unsigned long flags; e651a1da442ae02 Srinivas Pandruvada 2015-02-19 731 int i; 401ca24fb34aee0 srinivas pandruvada 2012-09-05 732 401ca24fb34aee0 srinivas pandruvada 2012-09-05 733 hid_dbg(hdev, " hardware removed\n"); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 734 hid_hw_close(hdev); f2f13a68c37c13a Axel Lin 2012-09-19 735 hid_hw_stop(hdev); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 736 spin_lock_irqsave(&data->lock, flags); e651a1da442ae02 Srinivas Pandruvada 2015-02-19 737 for (i = 0; i < data->hid_sensor_client_cnt; ++i) { e651a1da442ae02 Srinivas Pandruvada 2015-02-19 @738 struct hid_sensor_hub_device *hsdev = e651a1da442ae02 Srinivas Pandruvada 2015-02-19 739 data->hid_sensor_hub_client_devs[i].platform_data; e651a1da442ae02 Srinivas Pandruvada 2015-02-19 740 if (hsdev->pending.status) e651a1da442ae02 Srinivas Pandruvada 2015-02-19 741 complete(&hsdev->pending.ready); e651a1da442ae02 Srinivas Pandruvada 2015-02-19 742 } 401ca24fb34aee0 srinivas pandruvada 2012-09-05 743 spin_unlock_irqrestore(&data->lock, flags); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 744 mfd_remove_devices(&hdev->dev); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 745 mutex_destroy(&data->mutex); 401ca24fb34aee0 srinivas pandruvada 2012-09-05 746 } 401ca24fb34aee0 srinivas pandruvada 2012-09-05 747 :::::: The code at line 738 was first introduced by commit :::::: e651a1da442ae02a50081e38309dea5e89da2d41 HID: hid-sensor-hub: Allow parallel synchronous reads :::::: TO: Srinivas Pandruvada <srinivas.pandruvada(a)linux.intel.com&gt; :::::: CC: Jiri Kosina <jkosina(a)suse.cz&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org