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From: Thomas Gleixner <tglx@linutronix.de>
To: Roland Dreier <rdreier@cisco.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Thomas Mingarelli <thomas.mingarelli@hp.com>
Subject: Re: hpwdt oops in clflush_cache_range
Date: Wed, 27 Feb 2008 20:48:03 +0100 (CET)	[thread overview]
Message-ID: <alpine.LFD.1.00.0802272011130.7583@apollo.tec.linutronix.de> (raw)
In-Reply-To: <ada1w6y1bzk.fsf@cisco.com>

On Wed, 27 Feb 2008, Roland Dreier wrote:

>  > Can you provide a full boot log please ?
> 
> Sure, below.

> [    0.004000] Intel(R) Xeon(R) CPU            5160  @ 3.00GHz stepping 06

This one has 36bit physical address space. You can verify that via
/proc/cpuinfo

> [ 8425.910898] ACPI: PCI Interrupt 0000:01:04.0[A] -> GSI 21 (level, low) -> IRQ 21
> [ 8425.915097] hpwdt: New timer passed in is 30 seconds.
> [ 8425.915139] BUG: unable to handle kernel paging request at ffffc20001a0a000
> [ 8425.919087] IP: [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
> [ 8425.919087] PGD 1bf80e067 PUD 1bf80f067 PMD 1bb497067 PTE 80000047000ee17b

While the physical address of your ioremap is 47000ee000.

2^ 36 == 1000000000
---->    47000ee000

So the fault is not very surprising. Unfortunately we do not check,
whether physaddr is inside the valid physical address space. I whip up
a patch to do that.

Can you please instrument the driver to figure out where this
information comes from ? Or maybe lspci tells already.

Thanks,

	tglx

  reply	other threads:[~2008-02-27 19:48 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-27 17:08 Roland Dreier
2008-02-27 17:37 ` Mingarelli, Thomas
2008-02-27 18:14 ` Thomas Gleixner
2008-02-27 18:38   ` Roland Dreier
2008-02-27 19:48     ` Thomas Gleixner [this message]
2008-02-27 20:36       ` Ingo Molnar
2008-02-27 20:42         ` Thomas Gleixner
2008-02-27 20:44           ` Ingo Molnar
2008-02-27 20:59           ` Thomas Gleixner
2008-02-27 21:14             ` Ingo Molnar
2008-02-27 21:17             ` Roland Dreier
2008-02-27 21:35               ` Roland Dreier
2008-02-27 23:44               ` Mingarelli, Thomas
2008-02-28  0:12                 ` Roland Dreier
2008-02-28  3:09                   ` Mingarelli, Thomas
     [not found]                   ` <E14D1C2A44812C4F9C3ED321127EDF6505829D5D6C@G3W0854.americas.hpqcorp.net>
2008-02-28 17:38                     ` [PATCH] [WATCHDOG] Fix declaration of struct smbios_entry_point in hpwdt Roland Dreier
2008-02-28 17:48                       ` [PATCH for 2.6.26] [WATCHDOG] Fix return value warning " Roland Dreier
2008-02-28 20:34                       ` [PATCH] [WATCHDOG] hpwdt: Use dmi_walk() instead of own copy Roland Dreier
2008-02-28 21:24                         ` Mingarelli, Thomas
2008-02-28 21:26                         ` Wim Van Sebroeck

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