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From:   Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date:   Tue, 31 Mar 2020 17:03:07 -0700
Message-ID: <CAEf4BzZXtCPhhntbgrqL0z9aX4yrNUXfFZPk+qb_5-+Nx6PRzw@mail.gmail.com>
Subject: Re: [PATCH v2 bpf] kbuild: fix dependencies for DEBUG_INFO_BTF
To:     Slava Bacherikov <slava@bacher09.org>
Cc:     Andrii Nakryiko <andriin@fb.com>,
        Kees Cook <keescook@chromium.org>, bpf <bpf@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        Jann Horn <jannh@google.com>,
        Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        kernel-hardening@lists.openwall.com,
        Liu Yiding <liuyd.fnst@cn.fujitsu.com>
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On Tue, Mar 31, 2020 at 2:57 PM Slava Bacherikov <slava@bacher09.org> wrote:
>
> Currently turning on DEBUG_INFO_SPLIT when DEBUG_INFO_BTF is also
> enabled will produce invalid btf file, since gen_btf function in
> link-vmlinux.sh script doesn't handle *.dwo files.
>
> Enabling DEBUG_INFO_REDUCED will also produce invalid btf file, and
> using GCC_PLUGIN_RANDSTRUCT with BTF makes no sense.
>
> Signed-off-by: Slava Bacherikov <slava@bacher09.org>
> Reported-by: Jann Horn <jannh@google.com>
> Reported-by: Liu Yiding <liuyd.fnst@cn.fujitsu.com>
> Fixes: e83b9f55448a ("kbuild: add ability to generate BTF type info for vmlinux")
> ---

LGTM, but let's wait on Kees about COMPILE_TEST dependency...

Acked-by: Andrii Nakryiko <andriin@fb.com>

>  lib/Kconfig.debug | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index f61d834e02fe..9ae288e2a6c0 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -223,6 +223,7 @@ config DEBUG_INFO_DWARF4
>  config DEBUG_INFO_BTF
>         bool "Generate BTF typeinfo"
>         depends on DEBUG_INFO
> +       depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED && !GCC_PLUGIN_RANDSTRUCT
>         help
>           Generate deduplicated BTF type information from DWARF debug info.
>           Turning this on expects presence of pahole tool, which will convert
> --
> 2.24.1
>