linux-kernel - Re: [REGRESSION][PATCH V5 3/3] bpf jit: Let the powerpc jit handle negative offsets

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Message-Id: <20120430.134148.722408249106132399.davem@davemloft.net>
Date:	Mon, 30 Apr 2012 13:41:48 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kaffeemonster@...glemail.com
Cc:	netdev@...r.kernel.org, benh@...nel.crashing.org,
	eric.dumazet@...il.com, matt@...abs.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [REGRESSION][PATCH V5 3/3] bpf jit: Let the powerpc jit handle
 negative offsets

From: Jan Seiffert <kaffeemonster@...glemail.com>
Date: Mon, 30 Apr 2012 07:02:19 +0200

> 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.
> 
> Tested-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Signed-off-by: Jan Seiffert <kaffeemonster@...glemail.com>

Applied, thanks.
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