From: Thomas Gleixner <tglx@linutronix.de>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
x86@kernel.org
Subject: Re: Ask help about pre_init_apic_IRQ0()
Date: Fri, 12 Sep 2014 10:26:26 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.10.1409121020290.4178@nanos> (raw)
In-Reply-To: <1410509968.7023.33.camel@linux.intel.com>
On Fri, 12 Sep 2014, Andy Shevchenko wrote:
> On Thu, 2014-09-11 at 23:59 +0200, Thomas Gleixner wrote:
> > > > x86_intel_mid_timer=apbt_only
>
> w/o patch
>
> [ 0.000000] Early APIC setup for system timer0
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: CPU: 0 PID: 0 at
> arch/x86/kernel/apic/apic.c:1393 setup_local_APIC+0x20c/0x2d9()
>
> ...and stuck a bit later
Right, because there is no apbt timer in that machine and the
commandline tells the kernel to use it and ignore the local apic
timer.
> > > > or
> > > > x86_intel_mid_timer=lapic_and_apbt
> > >
> > > [ 0.116858] BUG: unable to handle kernel NULL pointer dereference at
> > > 0000003a
> > > [ 0.123820] IP: [<c1071c0e>] setup_irq+0xf/0x4d
> > > ...
> > >
>
> w/o patch
>
> [ 0.000000] Early APIC setup for system timer0
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: CPU: 0 PID: 0 at
> arch/x86/kernel/apic/apic.c:1393 setup_local_APIC+0x20c/0x2d9()
>
> ...and boots normally
Right, because it uses the local apic timer later on.
Thanks for providing the data! I'll queue a removal of this mess.
Thanks,
tglx
next prev parent reply other threads:[~2014-09-12 8:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 8:44 Jiang Liu
2014-09-11 8:53 ` Mika Westerberg
2014-09-11 9:08 ` Andy Shevchenko
2014-09-11 23:17 ` David Cohen
2014-09-11 12:58 ` Thomas Gleixner
2014-09-11 14:03 ` Andy Shevchenko
2014-09-11 14:35 ` Thomas Gleixner
2014-09-11 15:15 ` Andy Shevchenko
2014-09-11 21:59 ` Thomas Gleixner
2014-09-12 8:19 ` Andy Shevchenko
2014-09-12 8:26 ` Thomas Gleixner [this message]
2014-09-12 9:25 ` Andy Shevchenko
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