linux-kernel - Re: lib/klist.c: bit 0 in pointer can't be used as flag

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Message-ID: <20090114101851.GE19262@axis.com>
Date:	Wed, 14 Jan 2009 11:18:51 +0100
From:	Jesper Nilsson <Jesper.Nilsson@...s.com>
To:	David Miller <davem@...emloft.net>
Cc:	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"tj@...nel.org" <tj@...nel.org>, "gregkh@...e.de" <gregkh@...e.de>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	"hinko.kocevar@...rtapot.si" <hinko.kocevar@...rtapot.si>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: lib/klist.c: bit 0 in pointer can't be used as flag

On Tue, Jan 13, 2009 at 11:45:21PM +0100, David Miller wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Wed, 14 Jan 2009 07:40:19 +0900
> 
> > > It may be that we've worked around the other spots, although I haven't
> > > seen anything like that, we might just have been lucky until now.
> > >
> > > Can you recall another place where this trick is used?
> > 
> > rmap.
> > Don't CRIS use mmu?
> 
> I'm beginning to suspect the issue is only with objects
> in the kernel image itself.  Dynamically allocated memory
> is properly aligned and therefore the "low bit status bits
> in pointer" trick works.

Yes, that agrees with what I see here, and why we haven't seen this
problem more often.

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com
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