linux-kernel - Re: divide by zero oops in kernel 3.17.7

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Message-ID: <CAH6sp9OeC779F=3j47w286M49vH6=WqA4D35XBEaaUpk65EY1g@mail.gmail.com>
Date:	Thu, 5 Feb 2015 09:43:00 +0100
From:	Frans Klaver <fransklaver@...il.com>
To:	william <william@...sse.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Michal Hocko <mhocko@...e.cz>
Subject: Re: divide by zero oops in kernel 3.17.7

On Thu, Feb 5, 2015 at 9:39 AM, Frans Klaver <fransklaver@...il.com> wrote:
> On Thu, Feb 5, 2015 at 5:08 AM, william <william@...sse.org> wrote:
>> so it seems that i m hitting this bug :
>> https://lkml.org/lkml/2014/4/29/497
>>
>> + if (!divisor)
>> + divisor = 1;
>>
>> that have been fixed ( well it looks more like a workaround than a fix
>> seen from here ) in the 64 bit code but not in the 32 bit code ? I
>> understand it right ?

I forgot to mention that the eventual fix is not the original patch
submission. d5c9fde3dae75088916 (mm/page-writeback.c: fix divide by
zero in pos_ratio_polynom) ended up being merged.

Frans
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