netdev - Re: [PATCH v2 net] bpf: do not use reciprocal divide

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Date:	Wed, 15 Jan 2014 17:02:30 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
	hannes@...essinduktion.org, netdev@...r.kernel.org,
	dborkman@...hat.com, darkjames-ws@...kjames.pl, mgherzan@...il.com,
	rmk+kernel@....linux.org.uk, matt@...abs.org
Subject: Re: [PATCH v2 net] bpf: do not use reciprocal divide

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 15 Jan 2014 06:50:07 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> At first Jakub Zawadzki noticed that some divisions by reciprocal_divide
> were not correct. (off by one in some cases)
> http://www.wireshark.org/~darkjames/reciprocal-buggy.c
> 
> He could also show this with BPF:
> http://www.wireshark.org/~darkjames/set-and-dump-filter-k-bug.c
> 
> The reciprocal divide in linux kernel is not generic enough,
> lets remove its use in BPF, as it is not worth the pain with
> current cpus.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Jakub Zawadzki <darkjames-ws@...kjames.pl>

Applied and queued up for -stable, thanks Eric.
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