From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Linux 3.4 dom0 kernel error loading
 xen-acpi-processor: Input/output error
Date: Mon, 25 Feb 2013 12:03:21 -0500
Message-ID: <20130225170321.GA11165@phenom.dumpdata.com>
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To: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Cc: David Vrabel <david.vrabel@citrix.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

On Thu, Feb 21, 2013 at 02:42:52PM +0200, Pasi K=E4rkk=E4inen wrote:
> On Thu, Feb 21, 2013 at 07:29:13AM -0500, Konrad Rzeszutek Wilk wrote:
> > On Thu, Feb 21, 2013 at 11:24:34AM +0200, Pasi K=E4rkk=E4inen wrote:
> > > Hello,
> > > =

> > > Does anyone know why loading xen-acpi-processor driver fails like thi=
s?:
> > > =

> > > # modprobe xen-acpi-processor
> > > FATAL: Error inserting xen_acpi_processor (/lib/modules/3.4.32-6.el6.=
centos.alt.x86_64/kernel/drivers/xen/xen-acpi-processor.ko): Input/output e=
rror
> > > =

> > > Using "modprobe -v" doesn't provide any more information about the pr=
oblem.
> > > Also there's nothing in dom0 kernel dmesg.
> > > =

> > > Hardware is Dell R510 server with Intel Xeon 5600 series CPU. =

> > > Xen 4.2.1.
> > > =

> > > Kernel is based on 3.4.32 (so the upstream kernel.org longterm stable=
 version) =

> > > with some additional Xen patches backported from later upstream kerne=
ls. =

> > > Any tips how to troubleshoot this? =

> > =

> > Rebuild the module and add this
> > diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-pr=
ocessor.c
> > index 316df65..5d824a2 100644
> > --- a/drivers/xen/xen-acpi-processor.c
> > +++ b/drivers/xen/xen-acpi-processor.c
> > @@ -16,6 +16,7 @@
> >   * more details.
> >   *
> >   */
> > +#define DEBUG 1
> >  =

> >  #include <linux/cpumask.h>
> >  #include <linux/cpufreq.h>
> > =

> > =

> > That should help in figuring it out.
> > =

> =

> Ok, I'll do that.
> =

> Thanks!

The other thing is that I've been running with this compiled as '=3Dy' inst=
ead
of '=3Dm'!

That should temporarily fix it for you, but this does need to be fixed.