Hi Sergei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on block/for-next] [also build test WARNING on hch-configfs/for-next v5.12-rc6] [cannot apply to dm/for-next next-20210409] [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/Sergei-Shtepa/block-device-inter... base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next config: x86_64-randconfig-s032-20210409 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-279-g6d5d9b42-dirty # https://github.com/0day-ci/linux/commit/df79fb333cb0a1263a1f03f54de425507... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sergei-Shtepa/block-device-interposer/20210409-194943 git checkout df79fb333cb0a1263a1f03f54de425507e3c2238 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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-table.c:337:63: sparse: expected restricted fmode_t [usertype] mode drivers/md/dm-table.c:337:63: sparse: got bool [usertype] interpose -- Please review and possibly fold the followup patch. vim +337 drivers/md/dm-table.c 322 323 /* 324 * This upgrades the mode on an already open dm_dev, being 325 * careful to leave things as they were if we fail to reopen the 326 * device and not to touch the existing bdev field in case 327 * it is accessed concurrently. 328 */ 329 static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode, 330 bool interpose, struct mapped_device *md) 331 { 332 int r; 333 struct dm_dev *old_dev, *new_dev; 334 335 old_dev = dd->dm_dev; 336 338 dd->dm_dev->mode | new_mode, &new_dev); 339 if (r) 340 return r; 341 342 dd->dm_dev = new_dev; 343 dm_put_table_device(md, old_dev); 344 345 return 0; 346 } 347 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org