From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Bryan Donlan <bdonlan@gmail.com>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: Kernel OOPS and panic on boot in advantech watchdog init
Date: Fri, 19 Sep 2008 15:28:28 -0700 [thread overview]
Message-ID: <48D4278C.8020409@goop.org> (raw)
In-Reply-To: <20080919113356.111ce79f@lxorguk.ukuu.org.uk>
Alan Cox wrote:
> Looks like yet another Xen bug
>
No, we've been over this before.
>> [ 30.328280] BUG: unable to handle kernel paging request at d6023220
>> [ 30.332244] IP: [<c021f6f3>] xen_set_pte+0x3/0x10
>>
>
> sc520 tries to make an ioremap to read 0xfffefcb0
>
>
>> [ 30.332244] [<c037be42>] ioremap_page_range+0x1e2/0x280
>> [ 30.332244] [<c023d311>] __ioremap_caller+0x1e1/0x340
>>
>
> The Xen glue should have either permitted the mapping or failed the
> ioremap attempt with NULL.
Xen glue doesn't get in at that level. The first Xen knows about the
mapping is the attempt to set a pte with meaningless contents.
I still think the sc520 driver should make some rudimentary attempt to
see if its actually running on a relevant system (ie, an AMD Elan)
before creating iomappings. I don't know if DMI, cpuid or some other
mechanism would be best though.
J
prev parent reply other threads:[~2008-09-19 22:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-19 2:02 Kernel OOPS and panic on boot in advantech watchdog init Bryan Donlan
2008-09-19 2:09 ` Jeremy Fitzhardinge
2008-09-19 10:33 ` Alan Cox
2008-09-19 22:28 ` Jeremy Fitzhardinge [this message]
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