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Date:   Wed, 13 Jan 2021 16:07:39 -0700
From:   Nathan Chancellor <>
To:     Andrii Nakryiko <>
Cc:     Masahiro Yamada <>,
        Michal Marek <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        John Fastabend <>,
        KP Singh <>,
        Linux Kernel Mailing List <>,
        Linux Kbuild mailing list <>,
        Networking <>, bpf <>,
        Sedat Dilek <>
Subject: Re: [PATCH] bpf: Hoise pahole version checks into Kconfig

On Wed, Jan 13, 2021 at 02:38:27PM -0800, Andrii Nakryiko wrote:
> Hm.. Just saw Linus proposing using $(error-if) in Kconfig for an
> unrelated issue ([0]). If we can make this work, then it would catch
> such issue early on, yet won't have any downsides of hiding
> CONFIG_DEBUG_INFO_BTF if pahole is too old. WDYT?
>   [0]

Yes, I think that would be exactly what we want because DEBUG_INFO_BTF
could cause the build to error if PAHOLE_VERSION is not >= 116. I will
try to keep an eye on that thread to see how it goes then respin this
based on anything that comes from it.


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