tree: https://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git bpf-task-local-storage-prealloc head: 5e3ad0d4a0b0732e7ebe035582d282ab752397ed commit: 5e3ad0d4a0b0732e7ebe035582d282ab752397ed [3/3] bpf: Implement prealloc for task_local_storage config: openrisc-randconfig-r005-20211019 (attached as .config) compiler: or1k-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://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git/commit/?id=5e... git remote add tj-misc https://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git git fetch --no-tags tj-misc bpf-task-local-storage-prealloc git checkout 5e3ad0d4a0b0732e7ebe035582d282ab752397ed # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=openrisc SHELL=/bin/bash kernel/bpf/ 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 >>): kernel/bpf/bpf_task_storage.c: In function 'task_storage_map_alloc': 371 | smap->map.ops = &task_storage_map_ops; | ^~~~~~~~~~~~~~~~~~~~ | task_storage_map_alloc kernel/bpf/bpf_task_storage.c:371:34: note: each undeclared identifier is reported only once for each function it appears in vim +371 kernel/bpf/bpf_task_storage.c 355 356 static struct bpf_map *task_storage_map_alloc(union bpf_attr *attr) 357 { 358 struct bpf_local_storage_map *smap; 359 int err; 360 361 smap = bpf_local_storage_map_alloc(attr); 362 if (IS_ERR(smap)) 363 return ERR_CAST(smap); 364 365 if (!(attr->map_flags & BPF_F_NO_PREALLOC)) { 366 /* We're going to exercise the regular update path to populate 367 * the map for the existing tasks, which will call into map ops 368 * which is normally initialized after this function returns. 369 * Initialize it early here. 370 */ 372 373 percpu_down_write(&threadgroup_rwsem); 374 list_add_tail(&smap->prealloc_node, &prealloc_smaps); 375 err = task_storage_map_populate(smap); 376 percpu_up_write(&threadgroup_rwsem); 377 if (err) { 378 bpf_local_storage_map_free(smap, 379 &bpf_task_storage_busy); 380 return ERR_PTR(err); 381 } 382 } 383 384 smap->cache_idx = bpf_local_storage_cache_idx_get(&task_cache); 385 return &smap->map; 386 } 387 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org