linux-kernel - Re: do_div() silently truncates "base" to 32bit

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Message-ID: <1377905319.2070.38.camel@joe-AO722>
Date:	Fri, 30 Aug 2013 16:28:39 -0700
From:	Joe Perches <joe@...ches.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	Anatol Pomozov <anatol.pomozov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	bernie@...eler.com, Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: do_div() silently truncates "base" to 32bit

On Fri, 2013-08-30 at 15:48 -0700, Randy Dunlap wrote:
> On 08/30/13 15:14, Anatol Pomozov wrote:
> > But another question still remains: why compiler does not warn that
> > size truncation happens? How to prevent bugs like CFQ one in the
> > future? Should we add a compile-time assert to do_div() to prevent
> > passing 64 numbers in "base" macro parameter?
> That sounds like a fine idea to me.

Geert thought so too and submitted a patch

http://www.spinics.net/lists/linux-btrfs/msg26788.html


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