From: David Howells <dhowells@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: dhowells@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
alan@redhat.com, Markus.Lidel@shadowconnect.com, vvs@sw.ru,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] Mark i2o config broken on 64-bit platforms.
Date: Wed, 09 Jul 2008 17:18:18 +0100 [thread overview]
Message-ID: <24339.1215620298@redhat.com> (raw)
In-Reply-To: <20080709154649.57f66bb9@the-village.bc.nu>
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> 64bit kernel 32bit user space should be fine,
There's a place I pointed out in an earlier email where it appears a 64-bit
kernel can screw up, even with a 32-bit userspace. It allocates a piece of
RAM with kmalloc(), takes the address of it, passes that through
virt_to_bus(), discards the upper 32-bits from the result and posts it in an
I2O message, presumably to the device. That would appear likely to go kaboom
on a 64-bit system with more than 4GB of RAM.
If the device doesn't use that address, then why pass it at all?
David
next prev parent reply other threads:[~2008-07-09 16:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-09 11:35 [PATCH] Mark i2o config broken on 64-bit platforms David Howells
2008-07-09 11:47 ` Andrew Morton
2008-07-09 12:07 ` David Howells
2008-07-09 13:47 ` Miquel van Smoorenburg
2008-07-09 14:15 ` David Howells
2008-07-09 15:08 ` Bernd Petrovitsch
2008-07-09 15:49 ` Alan Cox
2008-07-09 16:42 ` David Howells
2008-07-09 19:06 ` Miquel van Smoorenburg
2008-07-09 19:13 ` James Bottomley
2008-07-09 19:22 ` Miquel van Smoorenburg
2008-07-09 19:59 ` James Bottomley
2008-07-09 20:06 ` Miquel van Smoorenburg
2008-07-10 11:13 ` Alan Cox
2008-07-10 12:12 ` David Howells
2008-07-10 14:53 ` Alan Cox
2008-07-10 15:23 ` Alan Cox
2008-07-09 18:49 ` Miquel van Smoorenburg
2008-07-10 11:45 ` Alan Cox
2008-07-09 14:46 ` Alan Cox
2008-07-09 16:18 ` David Howells [this message]
2008-07-09 14:47 ` Alan Cox
2008-07-09 15:46 ` Jeff Garzik
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