Hi Stefan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on zohar-integrity/next-integrity] [also build test WARNING on linux/master linus/master v5.16-rc4 next-20211208] [cannot apply to jmorris-security/next-testing] [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/Stefan-Berger/ima-Namespace-IMA-... base: https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git next-integrity config: i386-randconfig-s031-20211207 (https://download.01.org/0day-ci/archive/20211209/202112092123.r0jOHT8e-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/0e5d16c2da02e9c61692836edf0b6f7f2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Stefan-Berger/ima-Namespace-IMA-with-audit-support-in-IMA-ns/20211209-062017 git checkout 0e5d16c2da02e9c61692836edf0b6f7f227e1867 # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/md/dm-ioctl.c: note: in included file: -- fs/open.c: note: in included file: fs/open.c:1011:21: sparse: sparse: restricted fmode_t degrades to integer -- fs/file_table.c: note: in included file: -- fs/namei.c: note: in included file: fs/namei.c:680:17: sparse: sparse: context imbalance in 'terminate_walk' - unexpected unlock fs/namei.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, include/linux/mmzone.h, ...): include/linux/rcupdate.h:718:9: sparse: sparse: context imbalance in 'try_to_unlazy' - unexpected unlock include/linux/rcupdate.h:718:9: sparse: sparse: context imbalance in 'try_to_unlazy_next' - unexpected unlock fs/namei.c:2318:19: sparse: sparse: context imbalance in 'path_init' - different lock contexts for basic block -- fs/attr.c: note: in included file: -- security/security.c: note: in included file: security/security.c:358:25: sparse: sparse: cast removes address space '__rcu' of expression -- security/keys/key.c: note: in included file: security/keys/key.c:123:17: sparse: sparse: context imbalance in 'key_user_put' - unexpected unlock vim +/CONFIG_IMA +263 include/linux/ima.h 260 261 static inline int create_ima_ns(struct user_namespace *user_ns) 262 { 264 user_ns->ima_ns = get_ima_ns(&init_ima_ns); 265 #endif 266 return 0; 267 } 268 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org