linux-kernel - Re: [PATCH] bpf: merge two CONFIG

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Date: Mon, 5 Feb 2024 08:37:14 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Yonghong Song <yonghong.song@...ux.dev>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org, 
	Andrii Nakryiko <andrii@...nel.org>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	KP Singh <kpsingh@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, 
	Stanislav Fomichev <sdf@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: merge two CONFIG_BPF entries

On Mon, Feb 5, 2024 at 3:11 AM Yonghong Song <yonghong.song@...ux.dev> wrote:
>
>
> On 2/3/24 11:56 PM, Masahiro Yamada wrote:
> > 'config BPF' exists in both init/Kconfig and kernel/bpf/Kconfig.
> >
> > Commit b24abcff918a ("bpf, kconfig: Add consolidated menu entry for bpf
> > with core options") added the second one to kernel/bpf/Kconfig instead
> > of moving the existing one.
> >
> > Merge them together.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >   init/Kconfig       | 5 -----
> >   kernel/bpf/Kconfig | 1 +
> >   2 files changed, 1 insertion(+), 5 deletions(-)
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 8d4e836e1b6b..46ccad83a664 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -1457,11 +1457,6 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
> >   config HAVE_PCSPKR_PLATFORM
> >       bool
> >
> > -# interpreter that classic socket filters depend on
> > -config BPF
> > -     bool
> > -     select CRYPTO_LIB_SHA1
> > -
> >   menuconfig EXPERT
> >       bool "Configure standard kernel features (expert users)"
> >       # Unhide debug options, to make the on-by-default options visible
> > diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig
> > index 6a906ff93006..bc25f5098a25 100644
> > --- a/kernel/bpf/Kconfig
> > +++ b/kernel/bpf/Kconfig
> > @@ -3,6 +3,7 @@
> >   # BPF interpreter that, for example, classic socket filters depend on.
> >   config BPF
> >       bool
> > +     select CRYPTO_LIB_SHA1
>
> Currently, the kernel/bpf directory is guarded with CONFIG_BPF
>    obj-$(CONFIG_BPF) += bpf/
> in kernel/bpf/Makefile.


Wrong.

"in kernel/Makefile".


Why is it related to this patch?



> Your patch probably works since there are lots of some other BPF related
> configurations which requires CONFIG_BPF. But maybe we sould
> keep 'config BPF' in init/Kconfig and remove 'config BPF'
> in kernel/bpf/Kconfig. This will be less confusing?


Why?



> >
> >   # Used by archs to tell that they support BPF JIT compiler plus which
> >   # flavour. Only one of the two can be selected for a specific arch since



-- 
Best Regards
Masahiro Yamada