Hi Song,

I love your patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Song-Liu/bpf-enable-task-local-storage-for-tracing-programs/20210223-092439
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: xtensa-randconfig-r034-20210222 (attached as .config)
compiler: xtensa-linux-gcc (GCC) 9.3.0
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://github.com/0day-ci/linux/commit/a1afc383ea0cda5b0221b111f208140114752782
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Song-Liu/bpf-enable-task-local-storage-for-tracing-programs/20210223-092439
        git checkout a1afc383ea0cda5b0221b111f208140114752782
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `notsupp_get_next_key':
   bpf_task_storage.c:(.text+0x14): undefined reference to `bpf_local_storage_lookup'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x18): undefined reference to `bpf_selem_unlink'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `task_storage_delete':
   bpf_task_storage.c:(.text+0x32): undefined reference to `bpf_local_storage_lookup'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x3e): undefined reference to `bpf_selem_unlink'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `bpf_pid_task_storage_delete_elem':
   bpf_task_storage.c:(.text+0x94): undefined reference to `bpf_local_storage_update'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `bpf_pid_task_storage_update_elem':
   bpf_task_storage.c:(.text+0xce): undefined reference to `bpf_local_storage_update'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x12c): undefined reference to `bpf_local_storage_lookup'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `bpf_pid_task_storage_lookup_elem':
   bpf_task_storage.c:(.text+0x148): undefined reference to `bpf_local_storage_cache_idx_free'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x14c): undefined reference to `bpf_local_storage_map_free'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x159): undefined reference to `bpf_local_storage_cache_idx_free'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x162): undefined reference to `bpf_local_storage_map_free'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x16c): undefined reference to `bpf_local_storage_map_alloc'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x170): undefined reference to `bpf_local_storage_cache_idx_get'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x17a): undefined reference to `bpf_local_storage_map_alloc'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x18b): undefined reference to `bpf_local_storage_cache_idx_get'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `task_storage_map_free':
   bpf_task_storage.c:(.text+0x1d3): undefined reference to `bpf_local_storage_lookup'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `task_storage_map_alloc':
   bpf_task_storage.c:(.text+0x1f6): undefined reference to `bpf_local_storage_update'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x208): undefined reference to `bpf_selem_unlink_map'
>> xtensa-linux-ld: bpf_task_storage.c:(.text+0x20c): undefined reference to `bpf_selem_unlink_storage_nolock'
   xtensa-linux-ld: kernel/bpf/bpf_task_storage.o: in function `bpf_task_storage_get':
   bpf_task_storage.c:(.text+0x252): undefined reference to `bpf_selem_unlink_map'
   xtensa-linux-ld: bpf_task_storage.c:(.text+0x25e): undefined reference to `bpf_selem_unlink_storage_nolock'
>> xtensa-linux-ld: kernel/bpf/bpf_task_storage.o:(.rodata+0x78): undefined reference to `bpf_local_storage_map_alloc_check'
>> xtensa-linux-ld: kernel/bpf/bpf_task_storage.o:(.rodata+0xd0): undefined reference to `bpf_local_storage_map_check_btf'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org