Add support for generating BTF for all variables

[kernel-patches-bot]

Pull request for series with
subject: Add support for generating BTF for all variables
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=692296

[kernel-patches-bot]

Upstream branch: c86df29
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=692296
version: 2

Pull request is NOT updated. Failed to apply https://patchwork.kernel.org/project/netdevbpf/list/?series=692296
error message:

Cmd('git') failed due to: exit code(128)
  cmdline: git am --3way
  stdout: 'Applying: dutil: return ELF section name when looked up by index
Patch failed at 0001 dutil: return ELF section name when looked up by index
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".'
  stderr: 'error: sha1 information is lacking or useless (dutil.c).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch'

conflict:

[kernel-patches-bot]

At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=692296 irrelevant now. Closing PR.