linux-kernel - RE: remap_pfn_range() not suitable for physical RAM?

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Message-ID: <7E82351C108FA840AB1866AC776AEC464FD82A88@orsmsx505.amr.corp.intel.com>
Date:	Tue, 10 Mar 2009 10:33:31 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Frank Mehnert <Frank.Mehnert@....COM>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"peterz@...radead.org" <peterz@...radead.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: RE: remap_pfn_range() not suitable for physical RAM?


Frank,

Patch here should eliminate the restriction.
http://marc.info/?l=linux-kernel&m=123664923030126&w=1

Thanks,
Venki
 

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org 
>[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Frank Mehnert
>Sent: Tuesday, March 10, 2009 1:04 AM
>To: linux-kernel@...r.kernel.org
>Cc: peterz@...radead.org; Siddha, Suresh B
>Subject: Re: remap_pfn_range() not suitable for physical RAM?
>
>Hi,
>
>sorry for re-posting this message and sorry for addressing you 
>directly.
>Perhaps you can help me again or can you give me a pointer for a proper
>documentation of the various *remap* and *vm_insert* functions:
>
>On Wednesday 04 March 2009, Frank Mehnert wrote:
>> since 2.6.29-rcX it seems to be not allowed anymore to use
>> remap_pfn_range() to remap physical RAM to userland. This restriction
>> applies only if CONFIG_X86_PAT is enabled. It seems that 
>vm_insert_page()
>> does not have this restriction. Am I correct? And what is the reason
>> for this restriction?
>
>Kind regards,
>
>Frank
>-- 
>Dr.-Ing. Frank Mehnert    Sun Microsystems    http://www.sun.com/
>--
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