linux-kernel - Re: [PATCH RFC net-next 01/14] net: filter: split filter.c into two files

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Message-ID: <8738ek5qyh.fsf@sejong.aot.lge.com>
Date:	Wed, 02 Jul 2014 13:23:34 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 01/14] net: filter: split filter.c into two files

Hi Alexei,

On Fri, 27 Jun 2014 17:05:53 -0700, Alexei Starovoitov wrote:
> BPF is used in several kernel components. This split creates logical boundary
> between generic eBPF core and the rest
>
> kernel/bpf/core.c: eBPF interpreter
>
> net/core/filter.c: classic->eBPF converter, classic verifiers, socket filters
>
> This patch only moves functions.
>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
>  kernel/Makefile     |    1 +
>  kernel/bpf/Makefile |    1 +
>  kernel/bpf/core.c   |  545 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  net/core/filter.c   |  520 ------------------------------------------------
>  4 files changed, 547 insertions(+), 520 deletions(-)
>  create mode 100644 kernel/bpf/Makefile
>  create mode 100644 kernel/bpf/core.c
>
> diff --git a/kernel/Makefile b/kernel/Makefile
> index f2a8b6246ce9..e7360b7c2c0e 100644
> --- a/kernel/Makefile
> +++ b/kernel/Makefile
> @@ -87,6 +87,7 @@ obj-$(CONFIG_RING_BUFFER) += trace/
>  obj-$(CONFIG_TRACEPOINTS) += trace/
>  obj-$(CONFIG_IRQ_WORK) += irq_work.o
>  obj-$(CONFIG_CPU_PM) += cpu_pm.o
> +obj-$(CONFIG_NET) += bpf/

But this still requires CONFIG_NET to use bpf.  Why not adding
CONFIG_BPF and making CONFIG_NET selects it?

Thanks,
Namhyung
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