Hi "Yordan, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on linux/master] [also build test WARNING on hnaz-mm/master linus/master v5.16-rc1 next-20211118] [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/Yordan-Karadzhov-VMware/namespac... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8ab774587903771821b59471cc723bba6d893942 config: m68k-allyesconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 11.2.0 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/a6c499bca3021a2106f1dfcbddb6c4945... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Yordan-Karadzhov-VMware/namespacefs-Proof-of-Concept/20211119-021813 git checkout a6c499bca3021a2106f1dfcbddb6c4945f521bae # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 159 | namespacefs_create_file(const char *name, struct dentry *parent, | ^~~~~~~~~~~~~~~~~~~~~~~ 168 | namespacefs_create_dir(const char *name, struct dentry *parent, | ^~~~~~~~~~~~~~~~~~~~~~ 179 | void namespacefs_remove_dir(struct dentry *dentry) | ^~~~~~~~~~~~~~~~~~~~~~ vim +/namespacefs_create_file +159 fs/namespacefs/inode.c 157 158 struct dentry * 160 const struct user_namespace *user_ns, 161 const struct file_operations *fops, 162 void *data) 163 { 164 return create(name, parent, user_ns, fops, data); 165 } 166 167 struct dentry * 169 const struct user_namespace *user_ns) 170 { 171 return create(name, parent, user_ns, NULL, NULL); 172 } 173 174 static void remove_one(struct dentry *d) 175 { 176 release_namespacefs(); 177 } 178 180 { 181 if (IS_ERR_OR_NULL(dentry)) 182 return; 183 184 if (pin_fs()) 185 return; 186 187 simple_recursive_removal(dentry, remove_one); 188 release_namespacefs(); 189 } 190 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org