Re: [PATCH 1/3] bpf: Move iterator functions into special init section

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On Wed, Nov 4, 2020 at 2:02 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
>
> With upcoming changes to pahole, that change the way how and
> which kernel functions are stored in BTF data, we need a way
> to recognize iterator functions.
>
> Iterator functions need to be in BTF data, but have no real
> body and are currently placed in .init.text section, so they
> are freed after kernel init and are filtered out of BTF data
> because of that.
>
> The solution is to place these functions under new section:
>   .init.bpf.preserve_type
>
> And add 2 new symbols to mark that area:
>   __init_bpf_preserve_type_begin
>   __init_bpf_preserve_type_end
>
> The code in pahole responsible for picking up the functions will
> be able to recognize functions from this section and add them to
> the BTF data and filter out all other .init.text functions.
>
> Suggested-by: Yonghong Song <yhs@xxxxxx>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>

Acked-by: Song Liu <songliubraving@xxxxxx>

[...]



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