linux-kernel - Re: [tip:x86/mm] x86, pae: Fix handling of large physical addresses in ioremap

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Message-ID: <4C376DE7.4000209@zytor.com>
Date:	Fri, 09 Jul 2010 11:43:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, kaneshige.kenji@...fujitsu.com,
	hpa@...ux.intel.com
CC:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86, pae: Fix handling of large physical addresses
 in ioremap

On 07/09/2010 11:31 AM, tip-bot for Kenji Kaneshige wrote:
> Commit-ID:  39d8c3ff39443825b6a21b28249fc4904809203f
> Gitweb:     http://git.kernel.org/tip/39d8c3ff39443825b6a21b28249fc4904809203f
> Author:     Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
> AuthorDate: Thu, 17 Jun 2010 10:30:06 +0900
> Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> CommitDate: Fri, 9 Jul 2010 10:51:39 -0700
> 
> x86, pae: Fix handling of large physical addresses in ioremap
> 
> Current x86 ioremap() doesn't handle physical address higher than
> 32-bit properly in X86_32 PAE mode. When physical address higher than
> 32-bit is passed to ioremap(), higher 32-bits in physical address is
> cleared wrongly. Due to this bug, ioremap() can map wrong address to
> linear address space.
> 
> In my case, 64-bit MMIO region was assigned to a PCI device (ioat
> device) on my system. Because of the ioremap()'s bug, wrong physical
> address (instead of MMIO region) was mapped to linear address space.
> Because of this, loading ioatdma driver caused unexpected behavior
> (kernel panic, kernel hangup, ...).
> 

Sorry, pushed the wrong version of this patch.  I will push the correct
one shortly.

	-hpa
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