Re: [PATCH bpf-next v2 2/2] selftests/bpf: Test resolve_btfids arena argument suffixes

> selftests/bpf: Test resolve_btfids arena argument suffixes
>
> Add a suffix-only kfunc declaration with arena annotations on all five
> arguments. Verify that resolve_btfids emits address_space(1) type tags
> for every position without KF_ARENA_ARG flags in the BTF ID sets.
>
> Represent expected arena arguments as a per-parameter bitmap so the
> test covers suffixes beyond the two positions expressible by flags.
>
> Signed-off-by: Kumar Kartikeya Dwivedi <[email protected]>

This isn't a bug, but would it be worth mentioning kfunc_f and kfunc_g in
the changelog?

The description talks about "a suffix-only kfunc declaration with arena
annotations on all five arguments" (which is kfunc_e), but the patch also
adds kfunc_f (a mixed prototype where only the second of three parameters
is suffixed and the third is a non-pointer) and kfunc_g (suffixes combined
with KF_ARENA_RET).

kfunc_f and kfunc_g arguably cover more interesting cases since they pin
down that unsuffixed and non-pointer parameters stay untagged and that
suffixes and flags compose.


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