linux-kernel - Re: [PATCH v2] ARM: net fix emit_udiv() for BPF_ALU | BPF_DIV

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Message-Id: <20150510.192055.1922692719262473644.davem@davemloft.net>
Date:	Sun, 10 May 2015 19:20:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nschichan@...ebox.fr
Cc:	linux@....linux.org.uk, mgherzan@...il.com, daniel@...earbox.net,
	ast@...mgrid.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] ARM: net fix emit_udiv() for BPF_ALU | BPF_DIV |
 BPF_K intruction.

From: Nicolas Schichan <nschichan@...ebox.fr>
Date: Wed,  6 May 2015 18:31:56 +0200

> In that case, emit_udiv() will be called with rn == ARM_R0 (r_scratch)
> and loading rm first into ARM_R0 will result in jit_udiv() function
> being called the same dividend and divisor. Fix that by loading rn
> first into ARM_R1 and then rm into ARM_R0.
> 
> Signed-off-by: Nicolas Schichan <nschichan@...ebox.fr>
> Cc: <stable@...r.kernel.org> # v3.13+
> Fixes: aee636c4809f (bpf: do not use reciprocal divide)

Applied, thank you.
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