Re: [PATCH bpf-next v7 1/7] libbpf: split bpf_core_apply_relo()

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On Tue, Feb 15, 2022 at 2:59 PM Mauricio Vásquez <mauricio@xxxxxxxxxx> wrote:
>
> BTFGen needs to run the core relocation logic in order to understand
> what are the types involved in a given relocation.
>
> Currently bpf_core_apply_relo() calculates and **applies** a relocation
> to an instruction. Having both operations in the same function makes it
> difficult to only calculate the relocation without patching the
> instruction. This commit splits that logic in two different phases: (1)
> calculate the relocation and (2) patch the instruction.
>
> For the first phase bpf_core_apply_relo() is renamed to
> bpf_core_calc_relo_insn() who is now only on charge of calculating the
> relocation, the second phase uses the already existing
> bpf_core_patch_insn(). bpf_object__relocate_core() uses both of them and
> the BTFGen will use only bpf_core_calc_relo_insn().
>
> Signed-off-by: Mauricio Vásquez <mauricio@xxxxxxxxxx>
> Signed-off-by: Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxx>
> Signed-off-by: Lorenzo Fontana <lorenzo.fontana@xxxxxxxxxx>
> Signed-off-by: Leonardo Di Donato <leonardo.didonato@xxxxxxxxxx>
> Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>

Acked-by: Alexei Starovoitov <ast@xxxxxxxxxx>




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