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

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Date:   Mon, 27 Jan 2020 23:25:03 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
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 <linux-um@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Gow <davidgow@...gle.com>,
        Heidi Fahim <heidifahim@...gle.com>
Subject: Re: [RFC v1 1/2] kbuild: add arch specific dependency for BTF support

On Mon, Jan 27, 2020 at 7:28 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> 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.

Sure. My apologies, I just used the kbuild subject prefix because
that's what the previous commit that touched BTF used. Will fix in
next revision.

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