linux-kernel - Re: [PATCH v2 bpf] kbuild: fix dependencies for DEBUG_INFO

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Message-ID: <20200331224022.GA23586@google.com>
Date:   Wed, 1 Apr 2020 00:40:22 +0200
From:   KP Singh <kpsingh@...omium.org>
To:     Slava Bacherikov <slava@...her09.org>
Cc:     andriin@...com, keescook@...omium.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, jannh@...gle.com,
        alexei.starovoitov@...il.com, 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 01-Apr 00:55, Slava Bacherikov 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")

I can say that I also got invalid BTF when I tried using
DEBUG_INFO_REDUCED.

So here's a first one from of these from me :)

Acked-by: KP Singh <kpsingh@...gle.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
>