netdev - Re: [RFC PATCH bpf-next 3/5] kbuild: Add CONFIG_DEBUG_INFO_BTF

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Date:   Thu, 5 Nov 2020 19:50:09 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [RFC PATCH bpf-next 3/5] kbuild: Add CONFIG_DEBUG_INFO_BTF_MODULES
 option or module BTFs

On Thu, Nov 5, 2020 at 7:48 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Thu, Nov 5, 2020 at 7:13 PM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > On Wed, Nov 04, 2020 at 08:51:38PM -0800, Andrii Nakryiko wrote:
> > >
> > > +config DEBUG_INFO_BTF_MODULES
> > > +     bool "Generate BTF for kernel modules"
> > > +     def_bool y
> > > +     depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF
> >
> > Does it need to be a new config ?
> > Can the build ran pahole if DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF ?
>
> It probably doesn't. If I drop the "bool" line, it will become
> non-configurable calculated Kconfig value, convenient to use
> everywhere. All the rest will stay exactly the same. It's nice to not
> have to do "if defined(DEBUG_INFO_BTF) && defined(MODULES) &&
> defined(PAHOLE_HAS_SPLIT_BTF)" checks, but rather a simple "ifdef
> CONFIG_DEBUG_INFO_BTF_MODULES". Does that work?

Makes sense.