Alexei Starovoitov wrote:

From: Alexei Starovoitov <ast@kernel.org>

Add new helper:

long bpf_btf_find_by_name_kind(u32 btf_fd, char *name, u32 kind, int flags)
	Description
		Find given name with given type in BTF pointed to by btf_fd.
		If btf_fd is zero look for the name in vmlinux BTF and in module's BTFs.
	Return
		Returns btf_id and btf_obj_fd in lower and upper 32 bits.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---

I'm missing some high-level concept on how this would be used? Where does btf_fd come
from and how is it used so that it doesn't break sig-check?

A use-case I'm trying to fit into this series is how to pass down a BTF fd/object
with the program. I know its not doing CO-RE yet but we would want it to use the
BTF object being passed down for CO-RE eventually. Will there be someway to do
that here? That looks like the btf_fd here.

Thanks,
John