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Commit 6018e1f407cc ("bpf: implement numbers iterator") added the BTF_TYPE_EMIT line that this patch is modifying. The struct btf_iter_num doesn't exist, so only a forward declaration is emitted in BTF: FWD 'btf_iter_num' fwd_kind=struct That commit was probably hoping to ensure that struct bpf_iter_num is emitted in vmlinux BTF. A previous version of this patch changed the line to emit the correct type, but Yonghong confirmed that it would definitely be emitted regardless in [0], so this patch simply removes the line. This isn't marked "Fixes" because the extraneous btf_iter_num FWD wasn't causing any issues that I noticed, aside from mild confusion when I looked through the code. [0]: https://lore.kernel.org/bpf/25d08207-43e6-36a8-5e0f-47a913d4cda5@linux.dev/ Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20231013204426.1074286-2-davemarchevsky@fb.com