tree: https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git blk-namespace.v2 head: 292c56144bc8965fbf622e63bda66cc40deeac87 commit: 147e14e30cde27157d6794c149aa0eb10f578ff1 [4/6] kernfs: propagate devices from initial namespace config: i386-tinyconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git/commi... git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git git fetch --no-tags hare-scsi-devel blk-namespace.v2 git checkout 147e14e30cde27157d6794c149aa0eb10f578ff1 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): lib/kobject.c: In function 'create_dir': 125 | kernfs_enable_init_ns_propagates(kobj->sd); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/kernfs_enable_init_ns_propagates +125 lib/kobject.c 82 83 static int create_dir(struct kobject *kobj) 84 { 85 const struct kobj_type *ktype = get_ktype(kobj); 86 const struct kobj_ns_type_operations *ops; 87 int error; 88 89 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj)); 90 if (error) 91 return error; 92 93 error = populate_dir(kobj); 94 if (error) { 95 sysfs_remove_dir(kobj); 96 return error; 97 } 98 99 if (ktype) { 100 error = sysfs_create_groups(kobj, ktype->default_groups); 101 if (error) { 102 sysfs_remove_dir(kobj); 103 return error; 104 } 105 } 106 107 /* 108 * @kobj->sd may be deleted by an ancestor going away. Hold an 109 * extra reference so that it stays until @kobj is gone. 110 */ 111 sysfs_get(kobj->sd); 112 113 /* 114 * If @kobj has ns_ops, its children need to be filtered based on 115 * their namespace tags. Enable namespace support on @kobj->sd. 116 */ 117 ops = kobj_child_ns_ops(kobj); 118 if (ops) { 119 BUG_ON(ops->type <= KOBJ_NS_TYPE_NONE); 120 BUG_ON(ops->type >= KOBJ_NS_TYPES); 121 BUG_ON(!kobj_ns_type_registered(ops->type)); 122 123 sysfs_enable_ns(kobj->sd, ops->type); 124 if (ops->initial_ns_propagates && ops->initial_ns_propagates()) 126 } 127 128 return 0; 129 } 130 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org