linux-kernel - Re: [PATCH 2/4] x86: ioremap: fix physical address check

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Date:	Mon, 14 Jun 2010 07:38:13 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, jbarnes@...tuousgeek.org
Subject: Re: [PATCH 2/4] x86: ioremap: fix physical address check

On Mon, 14 Jun 2010, Kenji Kaneshige wrote:

> - Architectural limit of physical address in x86 32-bit mode is 40-bit
>   (depnds on processor version).

 According to documentation I happen to have handy this limit is actually 
52 bits (and space is currently available in the data structures used for 
a possible future extension up to 63 bits).

  Maciej
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