Hi "Enrico, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on kdave/for-next] [also build test ERROR on linux/master linus/master v5.13-rc7] [cannot apply to ext4/dev next-20210622] [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/Enrico-Weigelt-metux-IT-consult/... base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next config: um-x86_64_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/2f26b6809e1541cf945da594ef5251e51... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Enrico-Weigelt-metux-IT-consult/fs-generic-file-operation-for-fstrim/20210622-211217 git checkout 2f26b6809e1541cf945da594ef5251e51ba73d3b # save the attached .config to linux build tree make W=1 ARCH=um SUBARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 930 | .fitrim = ext4_fitrim, | ^~~~~~ | fstrim 930 | .fitrim = ext4_fitrim, | ^~~~~~~~~~~ fs/ext4/file.c:930:13: note: (near initialization for 'ext4_file_operations') fs/ext4/file.c:930:13: note: (near initialization for 'ext4_file_operations.show_fdinfo') cc1: some warnings being treated as errors -- fs/ext4/ioctl.c: In function 'ext4_fitrim': 805 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | ^~ | s8 fs/ext4/ioctl.c:805:43: note: each undeclared identifier is reported only once for each function it appears in vim +930 fs/ext4/file.c 911 912 const struct file_operations ext4_file_operations = { 913 .llseek = ext4_llseek, 914 .read_iter = ext4_file_read_iter, 915 .write_iter = ext4_file_write_iter, 916 .iopoll = iomap_dio_iopoll, 917 .unlocked_ioctl = ext4_ioctl, 918 #ifdef CONFIG_COMPAT 919 .compat_ioctl = ext4_compat_ioctl, 920 #endif 921 .mmap = ext4_file_mmap, 922 .mmap_supported_flags = MAP_SYNC, 923 .open = ext4_file_open, 924 .release = ext4_release_file, 925 .fsync = ext4_sync_file, 926 .get_unmapped_area = thp_get_unmapped_area, 927 .splice_read = generic_file_splice_read, 928 .splice_write = iter_file_splice_write, 929 .fallocate = ext4_fallocate, 931 }; 932 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org