Hi Sebastian, I love your patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on char-misc/char-misc-testing v5.13-rc3] [cannot apply to spi/for-next next-20210528] [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/Sebastian-Reichel/GE-Healthcare-PPD-firmware-upgrade-driver-for-ACHC/20210528-193816 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: mips-randconfig-r031-20210528 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6505c630407c5feec818f0bb1c284f9eeebf2071) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/dac014da90e2715a80e4f7139ac40333cd3d4bec git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sebastian-Reichel/GE-Healthcare-PPD-firmware-upgrade-driver-for-ACHC/20210528-193816 git checkout dac014da90e2715a80e4f7139ac40333cd3d4bec # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/spi/spidev.c:730:5: warning: no previous prototype for function 'spidev_probe' [-Wmissing-prototypes] int spidev_probe(struct spi_device *spi) ^ drivers/spi/spidev.c:730:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int spidev_probe(struct spi_device *spi) ^ static >> drivers/spi/spidev.c:793:5: warning: no previous prototype for function 'spidev_remove' [-Wmissing-prototypes] int spidev_remove(struct spi_device *spi) ^ drivers/spi/spidev.c:793:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int spidev_remove(struct spi_device *spi) ^ static 2 warnings generated. vim +/spidev_probe +730 drivers/spi/spidev.c 729 > 730 int spidev_probe(struct spi_device *spi) 731 { 732 struct spidev_data *spidev; 733 int status; 734 unsigned long minor; 735 736 /* 737 * spidev should never be referenced in DT without a specific 738 * compatible string, it is a Linux implementation thing 739 * rather than a description of the hardware. 740 */ 741 WARN(spi->dev.of_node && 742 of_device_is_compatible(spi->dev.of_node, "spidev"), 743 "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node); 744 745 spidev_probe_acpi(spi); 746 747 /* Allocate driver data */ 748 spidev = kzalloc(sizeof(*spidev), GFP_KERNEL); 749 if (!spidev) 750 return -ENOMEM; 751 752 /* Initialize the driver data */ 753 spidev->spi = spi; 754 spin_lock_init(&spidev->spi_lock); 755 mutex_init(&spidev->buf_lock); 756 757 INIT_LIST_HEAD(&spidev->device_entry); 758 759 /* If we can allocate a minor number, hook up this device. 760 * Reusing minors is fine so long as udev or mdev is working. 761 */ 762 mutex_lock(&device_list_lock); 763 minor = find_first_zero_bit(minors, N_SPI_MINORS); 764 if (minor < N_SPI_MINORS) { 765 struct device *dev; 766 767 spidev->devt = MKDEV(SPIDEV_MAJOR, minor); 768 dev = device_create(spidev_class, &spi->dev, spidev->devt, 769 spidev, "spidev%d.%d", 770 spi->master->bus_num, spi->chip_select); 771 status = PTR_ERR_OR_ZERO(dev); 772 } else { 773 dev_dbg(&spi->dev, "no minor number available!\n"); 774 status = -ENODEV; 775 } 776 if (status == 0) { 777 set_bit(minor, minors); 778 list_add(&spidev->device_entry, &device_list); 779 } 780 mutex_unlock(&device_list_lock); 781 782 spidev->speed_hz = spi->max_speed_hz; 783 784 if (status == 0) 785 spi_set_drvdata(spi, spidev); 786 else 787 kfree(spidev); 788 789 return status; 790 } 791 EXPORT_SYMBOL_GPL(spidev_probe); 792 > 793 int spidev_remove(struct spi_device *spi) 794 { 795 struct spidev_data *spidev = spi_get_drvdata(spi); 796 797 /* prevent new opens */ 798 mutex_lock(&device_list_lock); 799 /* make sure ops on existing fds can abort cleanly */ 800 spin_lock_irq(&spidev->spi_lock); 801 spidev->spi = NULL; 802 spin_unlock_irq(&spidev->spi_lock); 803 804 list_del(&spidev->device_entry); 805 device_destroy(spidev_class, spidev->devt); 806 clear_bit(MINOR(spidev->devt), minors); 807 if (spidev->users == 0) 808 kfree(spidev); 809 mutex_unlock(&device_list_lock); 810 811 return 0; 812 } 813 EXPORT_SYMBOL_GPL(spidev_remove); 814 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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