[bpf-next:for-next 1055/1059] kernel/bpf/task_iter.c:593: undefined reference to `btf_task_struct_ids'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git for-next
head:   35cba2988fc65239d10566edc03cc0978382c25f
commit: 33c5cb36015ac1034b50b823fae367e908d05147 [1055/1059] bpf: Consolidate task_struct BTF_ID declarations
config: x86_64-randconfig-p001-20210825 (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/bpf/bpf-next.git/commit/?id=33c5cb36015ac1034b50b823fae367e908d05147
        git remote add bpf-next https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
        git fetch --no-tags bpf-next for-next
        git checkout 33c5cb36015ac1034b50b823fae367e908d05147
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   ld: kernel/bpf/task_iter.o: in function `task_iter_init':
>> kernel/bpf/task_iter.c:593: undefined reference to `btf_task_struct_ids'
>> ld: kernel/bpf/task_iter.c:598: undefined reference to `btf_task_struct_ids'
   ld: kernel/bpf/task_iter.c:604: undefined reference to `btf_task_struct_ids'
>> ld: kernel/bpf/bpf_task_storage.o:(.rodata+0x110): undefined reference to `btf_task_struct_ids'
   ld: kernel/bpf/bpf_task_storage.o:(.rodata+0x170): undefined reference to `btf_task_struct_ids'
   ld: kernel/bpf/stackmap.o:(.rodata+0x328): more undefined references to `btf_task_struct_ids' follow


vim +593 kernel/bpf/task_iter.c

   588	
   589	static int __init task_iter_init(void)
   590	{
   591		int ret;
   592	
 > 593		task_reg_info.ctx_arg_info[0].btf_id = btf_task_struct_ids[0];
   594		ret = bpf_iter_reg_target(&task_reg_info);
   595		if (ret)
   596			return ret;
   597	
 > 598		task_file_reg_info.ctx_arg_info[0].btf_id = btf_task_struct_ids[0];

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Attachment: .config.gz
Description: application/gzip