Hi Changming, Thank you for the patch! Yet something to improve: [auto build test ERROR on usb/usb-testing] [also build test ERROR on balbi-usb/testing/next v5.7-rc7 next-20200529] [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/Changming/USB-sisusbvga-series-of-changes-char-to-u8/20200601-012438 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2388a096e7865c043e83ece4e26654bd3d1a20d5) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>, old ones prefixed by <<): >> drivers/usb/misc/sisusbvga/sisusb.c:2996:11: error: incompatible function pointer types initializing 'ssize_t (*)(struct file *, char *, size_t, loff_t *)' (aka 'long (*)(struct file *, char *, unsigned long, long long *)') with an expression of type 'ssize_t (struct file *, u8 *, size_t, loff_t *)' (aka 'long (struct file *, unsigned char *, unsigned long, long long *)') [-Werror,-Wincompatible-function-pointer-types] .read = sisusb_read, ^~~~~~~~~~~ drivers/usb/misc/sisusbvga/sisusb.c:2997:11: error: incompatible function pointer types initializing 'ssize_t (*)(struct file *, const char *, size_t, loff_t *)' (aka 'long (*)(struct file *, const char *, unsigned long, long long *)') with an expression of type 'ssize_t (struct file *, const u8 *, size_t, loff_t *)' (aka 'long (struct file *, const unsigned char *, unsigned long, long long *)') [-Werror,-Wincompatible-function-pointer-types] .write = sisusb_write, ^~~~~~~~~~~~ 2 errors generated. vim +2996 drivers/usb/misc/sisusbvga/sisusb.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 2991 066202dd48cf32 Luiz Fernando N. Capitulino 2006-08-05 2992 static const struct file_operations usb_sisusb_fops = { ^1da177e4c3f41 Linus Torvalds 2005-04-16 2993 .owner = THIS_MODULE, ^1da177e4c3f41 Linus Torvalds 2005-04-16 2994 .open = sisusb_open, ^1da177e4c3f41 Linus Torvalds 2005-04-16 2995 .release = sisusb_release, ^1da177e4c3f41 Linus Torvalds 2005-04-16 @2996 .read = sisusb_read, ^1da177e4c3f41 Linus Torvalds 2005-04-16 2997 .write = sisusb_write, ^1da177e4c3f41 Linus Torvalds 2005-04-16 2998 .llseek = sisusb_lseek, 022e468e139573 Jiri Slaby 2019-01-22 2999 #ifdef CONFIG_COMPAT ^1da177e4c3f41 Linus Torvalds 2005-04-16 3000 .compat_ioctl = sisusb_compat_ioctl, ^1da177e4c3f41 Linus Torvalds 2005-04-16 3001 #endif 49f15255465321 Alan Cox 2008-05-22 3002 .unlocked_ioctl = sisusb_ioctl ^1da177e4c3f41 Linus Torvalds 2005-04-16 3003 }; ^1da177e4c3f41 Linus Torvalds 2005-04-16 3004 :::::: The code at line 2996 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds@xxxxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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