[PATCH bpf-next v4 00/12] bpf: Support dumping kfunc prototypes from BTF

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This patchset enables both detecting as well as dumping compilable
prototypes for kfuncs.

The first commit instructs pahole to DECL_TAG kfuncs when available.
This requires v1.27 or newer. v1.27 is nearing release at time of
writing. Following this, users will be able to look at BTF inside
vmlinux (or modules) and check if the kfunc they want is available.

The final commit teaches bpftool how to dump kfunc prototypes. This
is done for developer convenience.

The rest of the commits are fixups to enable selftests to use the
newly dumped kfunc prototypes. With these, selftests will regularly
exercise the newly added codepaths.

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