netdev - Re: [PATCH v4 bpf-next] Add CONFIG_DEBUG_INFO_BTF and CONFIG_DEBUG_INFO_BTF

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Date:   Mon, 22 Feb 2021 22:37:39 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     grantseltzer <grantseltzer@...il.com>
Cc:     Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Ian Rogers <irogers@...gle.com>,
        Yonghong Song <yhs@...com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Networking <netdev@...r.kernel.org>,
        Michal Rostecki <mrostecki@...nsuse.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next] Add CONFIG_DEBUG_INFO_BTF and
 CONFIG_DEBUG_INFO_BTF_MODULES check to bpftool feature command

On Mon, Feb 22, 2021 at 11:59 AM grantseltzer <grantseltzer@...il.com> wrote:
>
> This adds both the CONFIG_DEBUG_INFO_BTF and CONFIG_DEBUG_INFO_BTF_MODULES
> kernel compile option to output of the bpftool feature command.
> This is relevant for developers that want to account for data structure
> definition differences between kernels.
>
> Signed-off-by: Grant Seltzer <grantseltzer@...il.com>
> ---

Applied to bpf-next, but adjusted subject to shorter:

"Add kernel/modules BTF presence checks to bpftool feature command"

>  tools/bpf/bpftool/feature.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
> index 359960a8f..40a88df27 100644
> --- a/tools/bpf/bpftool/feature.c
> +++ b/tools/bpf/bpftool/feature.c
> @@ -336,6 +336,10 @@ static void probe_kernel_image_config(const char *define_prefix)
>                 { "CONFIG_BPF_JIT", },
>                 /* Avoid compiling eBPF interpreter (use JIT only) */
>                 { "CONFIG_BPF_JIT_ALWAYS_ON", },
> +               /* Kernel BTF debug information available */
> +               { "CONFIG_DEBUG_INFO_BTF", },
> +               /* Kernel module BTF debug information available */
> +               { "CONFIG_DEBUG_INFO_BTF_MODULES", },
>
>                 /* cgroups */
>                 { "CONFIG_CGROUPS", },
> --
> 2.29.2
>