Error: failed to load BTF from vmlinux: No data available

[kernel test robot <lkp@intel.com>]

Hi Changbin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6
commit: acd3b7768048fe338248cdf43ccfbf8c084a6bc1 libbpf: Return -ENODATA for missing btf section
date:   4 months ago
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acd3b7768048fe338248cdf43ccfbf8c084a6bc1
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout acd3b7768048fe338248cdf43ccfbf8c084a6bc1
        make O=/tmp/kselftest headers
        make O=/tmp/kselftest -C tools/testing/selftests

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305161058.hUHyPIjv-lkp@intel.com/

All errors (new ones prefixed by >>):

   libbpf: failed to find '.BTF' ELF section in vmlinux
>> Error: failed to load BTF from vmlinux: No data available
--
   libbpf: failed to find '.BTF' ELF section in vmlinux
>> Error: failed to load BTF from vmlinux: No data available
   make[3]: *** [Makefile:204: tools/bpf/bpftool/vmlinux.h] Error 195
   make[3]: *** Deleting file 'tools/bpf/bpftool/vmlinux.h'
   make[2]: *** [Makefile:113: bpftool] Error 2
   make[2]: *** Waiting for unfinished jobs....
   libbpf: failed to find '.BTF' ELF section in vmlinux
>> Error: failed to load BTF from vmlinux: No data available
   make[3]: *** [Makefile:76: tools/bpf/runqslower//vmlinux.h] Error 195
   make[3]: *** Deleting file 'tools/bpf/runqslower//vmlinux.h'
   make[2]: *** [Makefile:122: runqslower] Error 2

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