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Date: Tue, 31 Mar 2020 17:03:07 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Slava Bacherikov <slava@...her09.org>
Cc: Andrii Nakryiko <andriin@...com>, Kees Cook <keescook@...omium.org>, bpf <bpf@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>, Jann Horn <jannh@...gle.com>,
Alexei Starovoitov <alexei.starovoitov@...il.com>, Daniel Borkmann <daniel@...earbox.net>,
kernel-hardening@...ts.openwall.com, Liu Yiding <liuyd.fnst@...fujitsu.com>
Subject: Re: [PATCH v2 bpf] kbuild: fix dependencies for DEBUG_INFO_BTF
On Tue, Mar 31, 2020 at 2:57 PM Slava Bacherikov <slava@...her09.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@...her09.org>
> Reported-by: Jann Horn <jannh@...gle.com>
> Reported-by: Liu Yiding <liuyd.fnst@...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@...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
>
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