Re: [PATCH bpf-next] kbuild,bpf: switch to using --btf_features for pahole v1.26 and later

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On Wed, May 1, 2024 at 10:51 AM Alan Maguire <alan.maguire@xxxxxxxxxx> wrote:
>
> The btf_features list can be used for pahole v1.26 and later -
> it is useful because if a feature is not yet implemented it will
> not exit with a failure message.  This will allow us to add feature
> requests to the pahole options without having to check pahole versions
> in future; if the version of pahole supports the feature it will be
> added.
>
> Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
> ---
>  scripts/Makefile.btf | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
> index 82377e470aed..8e6a9d4b492e 100644
> --- a/scripts/Makefile.btf
> +++ b/scripts/Makefile.btf
> @@ -12,8 +12,11 @@ pahole-flags-$(call test-ge, $(pahole-ver), 121)     += --btf_gen_floats
>
>  pahole-flags-$(call test-ge, $(pahole-ver), 122)       += -j
>
> -pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE)         += --lang_exclude=rust
> -
>  pahole-flags-$(call test-ge, $(pahole-ver), 125)       += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized

given starting from 1.26 we use --btf-features, this should be `==
1.25` condition, not `>= 1.25`, right? It doesn't hurt right now, but
it's best to be explicitly that below `-j --btf_features=...` is all
that's necessary.

pw-bot: cr


>
> +# Switch to using --btf_features for v1.26 and later.
> +pahole-flags-$(call test-ge, $(pahole-ver), 126)       = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func
> +
> +pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE)         += --lang_exclude=rust
> +
>  export PAHOLE_FLAGS := $(pahole-flags-y)
> --
> 2.39.3
>





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