linux-kernel - Re: mmaping a kernel buffer to user space

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Message-ID: <45477EA8.8060809@gmail.com>
Date:	Tue, 31 Oct 2006 17:49:44 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Guillermo Marcus <marcus@...uni-mannheim.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: mmaping a kernel buffer to user space

Guillermo Marcus wrote:
> Hi Jiri,
> 
> The fact that it does not works with RAM is well documented in LDD3,
> pages 430++. It says (and I tested) that remap_xxx_range does not work
> in this case. They suggest a method using nopage, similar to the one I
> implement.

Could somebody confirm, that this still holds?

> I do not see why remap_xxx_range has the limitation, but it is there.
> The question is then: can the limitation be removed, or can we implement
> a new function that maps RAM all at once without the need for a nopage
> implementation?
> 
> In any case, here is the code.

Hmm, interesting. I used remap_pfn_range for this purpose today and it worked (I
double-checked this). I should probably do the rework :(.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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