linux-kernel - Re: [PATCH v12 net-next 03/11] bpf: add lookup/update/delete/iterate methods to BPF maps

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Message-ID: <CAMEtUux2mLD7X+PFq1kZv893Dg9u2rO6w=HwsOirx-VoYejuQQ@mail.gmail.com>
Date:	Tue, 16 Sep 2014 15:06:51 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	David Miller <davem@...emloft.net>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 net-next 03/11] bpf: add lookup/update/delete/iterate
 methods to BPF maps

On Tue, Sep 16, 2014 at 2:49 PM, David Miller <davem@...emloft.net> wrote:
> From: Alexei Starovoitov <ast@...mgrid.com>
> Date: Tue, 16 Sep 2014 14:23:27 -0700
>
>> no compat layer and type checking will be done
>> by syscall wrappers. Ok?
>
> Why are you against using strong typing just for everything other
> than the user pointer blobs?
>
> I don't understand the resistence to my suggestion to just use
> aligned_u64 instead of "void __user *" in the union members.

All these different variants are ok to me. There are pros and
cons to either approach. I'm not against strong typing.
I just thought it would be cleaner not to use 'union' and
was asking for opinion. That's all. Sure, I will keep 'union'
and only change pointers to __aligned_u64.
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