netdev - Re: [PATCH net-next 0/8] Add complementary BPF conditional jump instructions

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Date:	Mon, 31 Dec 2012 21:18:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	dborkman@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/8] Add complementary BPF conditional jump
 instructions

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 31 Dec 2012 19:29:02 -0800

> On Mon, 2012-12-31 at 14:37 -0800, David Miller wrote:
> 
>> Whilst I agree that adding NE jumps adds great value and closes a
>> serious gap, the rest can be synthesized by simply swapping the
>> arguments and using a comparison that does already exist.
>> 
>> Why isn't that sufficient?
> 
> I am afraid none of these patches is needed at all.
> 
> Swapping the jt/jf is plainly enough for the user land compiler.
> 
> libcap seems to do it already

Agreed.
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