On Wed, Nov 27, 2019 at 8:14 AM Stanislav Fomichev <sdf@xxxxxxxxxx> wrote:
>
> If vmlinux BTF generation fails, but CONFIG_DEBUG_INFO_BTF is set,
> .BTF section of vmlinux is empty and kernel will prohibit
> BPF loading and return "in-kernel BTF is malformed".
>
> --dump-section argument to binutils' objcopy was added in version 2.25.
> When using pre-2.25 binutils, BTF generation silently fails. Convert
> to --only-section which is present on pre-2.25 binutils.
>
> Documentation/process/changes.rst states that binutils 2.21+
> is supported, not sure those standards apply to BPF subsystem.
>
> v2:
> * exit and print an error if gen_btf fails (John Fastabend)
>
> v3:
> * resend with Andrii's Acked-by/Tested-by tags
>
> Cc: Andrii Nakryiko <andriin@xxxxxx>
> Cc: John Fastabend <john.fastabend@xxxxxxxxx>
> Fixes: 341dfcf8d78ea ("btf: expose BTF info through sysfs")
> Acked-by: Andrii Nakryiko <andriin@xxxxxx>
> Tested-by: Andrii Nakryiko <andriin@xxxxxx>
> Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
Applied. Thanks
