linux-kernel - Re: [RFC v1 1/2] kbuild: add arch specific dependency for BTF support

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Message-ID: <CAK7LNASR13WjasKPmq-8gURhNUpOsrsCN2ODUh56fpM9DKWq7A@mail.gmail.com>
Date:   Tue, 28 Jan 2020 12:27:26 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Changbin Du <changbin.du@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-um@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        davidgow@...gle.com, heidifahim@...gle.com
Subject: Re: [RFC v1 1/2] kbuild: add arch specific dependency for BTF support

Hi.

On Tue, Jan 28, 2020 at 4:36 AM Brendan Higgins
<brendanhiggins@...gle.com> wrote:
>
> Some archs (like UM) do not build with CONFIG_DEBUG_INFO_BTF=y, so add
> an options for archs to select to opt-in or out of BTF typeinfo support.


Could you use a different subject prefix (e.g. "btf:") ?

This is unrelated to kbuild.

Thanks.


> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> ---
>  lib/Kconfig.debug | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index e4676b992eae9..f5bcb391f1b7d 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -238,9 +238,12 @@ config DEBUG_INFO_DWARF4
>           But it significantly improves the success of resolving
>           variables in gdb on optimized code.
>
> +config ARCH_NO_BTF_TYPEINFO
> +       bool
> +
>  config DEBUG_INFO_BTF
>         bool "Generate BTF typeinfo"
> -       depends on DEBUG_INFO
> +       depends on DEBUG_INFO && !ARCH_NO_BTF_TYPEINFO
>         help
>           Generate deduplicated BTF type information from DWARF debug info.
>           Turning this on expects presence of pahole tool, which will convert
> --
> 2.25.0.341.g760bfbb309-goog
>


-- 
Best Regards
Masahiro Yamada