linux-kernel - Re: [REGRESSION][PATCH V4 2/3] bpf jit: Let the x86 jit handle negative offsets

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Message-ID: <1333133880.2325.2430.camel@edumazet-glaptop>
Date:	Fri, 30 Mar 2012 20:58:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	kaffeemonster@...glemail.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [REGRESSION][PATCH V4 2/3] bpf jit: Let the x86 jit handle
 negative offsets

On Fri, 2012-03-30 at 17:24 +0200, Jan Seiffert wrote:
> Now the helper function from filter.c for negative offsets is exported,
> it can be used it in the jit to handle negative offsets.
> 
> First modify the asm load helper functions to handle:
> - know positive offsets
> - know negative offsets
> - any offset
> 
> then the compiler can be modified to explicitly use these helper
> when appropriate.
> 
> This fixes the case of a negative X register and allows to lift
> the restriction that bpf programs with negative offsets can't
> be jited.
> 
> Signed-of-by: Jan Seiffert <kaffeemonster@...glemail.com>

Nice work Jan, thanks a lot.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>



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