From: Jesper Nilsson <Jesper.Nilsson@axis.com>
To: David Miller <davem@davemloft.net>
Cc: "kosaki.motohiro@jp.fujitsu.com" <kosaki.motohiro@jp.fujitsu.com>,
"tj@kernel.org" <tj@kernel.org>,
"gregkh@suse.de" <gregkh@suse.de>,
"stern@rowland.harvard.edu" <stern@rowland.harvard.edu>,
"jens.axboe@oracle.com" <jens.axboe@oracle.com>,
"hinko.kocevar@cetrtapot.si" <hinko.kocevar@cetrtapot.si>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: lib/klist.c: bit 0 in pointer can't be used as flag
Date: Wed, 14 Jan 2009 11:18:51 +0100 [thread overview]
Message-ID: <20090114101851.GE19262@axis.com> (raw)
In-Reply-To: <20090113.144521.97357573.davem@davemloft.net>
On Tue, Jan 13, 2009 at 11:45:21PM +0100, David Miller wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@jp.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@axis.com
next prev parent reply other threads:[~2009-01-14 10:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-13 15:14 Jesper Nilsson
2009-01-13 21:10 ` David Miller
2009-01-13 22:12 ` Jesper Nilsson
2009-01-13 22:40 ` KOSAKI Motohiro
2009-01-13 22:45 ` David Miller
2009-01-13 23:11 ` Bastien ROUCARIES
2009-01-14 10:19 ` Jesper Nilsson
2009-01-14 10:21 ` David Miller
2009-01-14 10:36 ` Jesper Nilsson
2009-01-14 10:45 ` David Miller
2009-01-14 11:02 ` Jesper Nilsson
2009-01-14 15:12 ` Jesper Nilsson
2009-01-14 18:17 ` Greg KH
2009-01-14 21:53 ` Jesper Nilsson
2009-01-13 23:54 ` KOSAKI Motohiro
2009-01-13 23:59 ` Greg KH
2009-01-14 10:25 ` Jesper Nilsson
2009-01-14 0:33 ` Hugh Dickins
2009-01-14 10:18 ` Jesper Nilsson [this message]
2009-01-13 22:42 ` David Miller
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