Hi Gabriel, I love your patch! Yet something to improve: [auto build test ERROR on ext3/fsnotify] [also build test ERROR on ext4/dev linus/master v5.13 next-20210629] [cannot apply to tytso-fscrypt/master] [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/Gabriel-Krisman-Bertazi/File-system-wide-monitoring/20210630-031347 base: https://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git fsnotify config: arm64-allyesconfig (attached as .config) compiler: aarch64-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/0day-ci/linux/commit/746524d8db08a041fed90e41b15c8e8ca69cb22d git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Gabriel-Krisman-Bertazi/File-system-wide-monitoring/20210630-031347 git checkout 746524d8db08a041fed90e41b15c8e8ca69cb22d # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash samples/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): >> samples/fanotify/fs-monitor.c:7:10: fatal error: errno.h: No such file or directory 7 | #include | ^~~~~~~~~ compilation terminated. vim +7 samples/fanotify/fs-monitor.c > 7 #include 8 #include 9 #include 10 #include 11 #include 12 #include 13 #include 14 #include 15 #include 16 #include 17 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org