tree: https://git.kernel.org/pub/scm/linux/kernel/git/snitzer/linux.git wip head: 7defd0da9dd27ae6261617d0518d8b6c421703d1 commit: 7defd0da9dd27ae6261617d0518d8b6c421703d1 [30/30] dm: simplify target code conditional on CONFIG_BLK_DEV_ZONED config: x86_64-randconfig-s022-20210209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/snitzer/linux.git/commit/... git remote add snitzer https://git.kernel.org/pub/scm/linux/kernel/git/snitzer/linux.git git fetch --no-tags snitzer wip git checkout 7defd0da9dd27ae6261617d0518d8b6c421703d1 # 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; All errors (new ones prefixed by >>): 487 | .report_zones = flakey_report_zones, | ^~~~~~~~~~~~ In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/linux/kasan-checks.h:5, from include/asm-generic/rwonce.h:26, from ./arch/x86/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:246, from include/linux/export.h:43, from include/linux/linkage.h:7, from include/linux/fs.h:5, from include/linux/highmem.h:5, from include/linux/bio.h:8, from include/linux/device-mapper.h:11, from drivers/md/dm-flakey.c:8: include/linux/stddef.h:8:14: warning: initialized field overwritten [-Woverride-init] 8 | #define NULL ((void *)0) | ^ drivers/md/dm-flakey.c:473:29: note: in expansion of macro 'NULL' 473 | #define flakey_report_zones NULL | ^~~~ drivers/md/dm-flakey.c:487:18: note: in expansion of macro 'flakey_report_zones' 487 | .report_zones = flakey_report_zones, | ^~~~~~~~~~~~~~~~~~~ include/linux/stddef.h:8:14: note: (near initialization for 'flakey_target.name') 8 | #define NULL ((void *)0) | ^ drivers/md/dm-flakey.c:473:29: note: in expansion of macro 'NULL' 473 | #define flakey_report_zones NULL | ^~~~ drivers/md/dm-flakey.c:487:18: note: in expansion of macro 'flakey_report_zones' 487 | .report_zones = flakey_report_zones, | ^~~~~~~~~~~~~~~~~~~ vim +487 drivers/md/dm-flakey.c 3407ef5262b55c Josef Bacik 2011-03-24 482 3407ef5262b55c Josef Bacik 2011-03-24 483 static struct target_type flakey_target = { 3407ef5262b55c Josef Bacik 2011-03-24 484 .name = "flakey", 124c44546d0cbf Damien Le Moal 2017-05-08 485 .version = {1, 5, 0}, 7e28f37ea16671 Satya Tangirala 2021-02-01 486 .features = DM_TARGET_ZONED_HM | DM_TARGET_PASSES_CRYPTO, e76239a3748c90 Christoph Hellwig 2018-10-12 @487 .report_zones = flakey_report_zones, 3407ef5262b55c Josef Bacik 2011-03-24 488 .module = THIS_MODULE, 3407ef5262b55c Josef Bacik 2011-03-24 489 .ctr = flakey_ctr, 3407ef5262b55c Josef Bacik 2011-03-24 490 .dtr = flakey_dtr, 3407ef5262b55c Josef Bacik 2011-03-24 491 .map = flakey_map, a3998799fb4df0 Mike Snitzer 2011-08-02 492 .end_io = flakey_end_io, 3407ef5262b55c Josef Bacik 2011-03-24 493 .status = flakey_status, e56f81e0b01ef4 Christoph Hellwig 2015-10-15 494 .prepare_ioctl = flakey_prepare_ioctl, 3407ef5262b55c Josef Bacik 2011-03-24 495 .iterate_devices = flakey_iterate_devices, 3407ef5262b55c Josef Bacik 2011-03-24 496 }; 3407ef5262b55c Josef Bacik 2011-03-24 497 :::::: The code at line 487 was first introduced by commit :::::: e76239a3748c90a8b0e197f8f4544a8ce52f126e block: add a report_zones method :::::: TO: Christoph Hellwig <hch(a)lst.de&gt; :::::: CC: Jens Axboe <axboe(a)kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org