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

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Date:	Tue, 31 Oct 2006 18:08:43 +0100
From:	Franck Bui-Huu <vagabon.xyz@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	Guillermo Marcus <marcus@...uni-mannheim.de>,
	linux-kernel@...r.kernel.org
Subject: Re: mmaping a kernel buffer to user space

Hi,

Jiri Slaby wrote:
> 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?

Apparently this restriction has been removed since 2.6.15 when
VM_PFNMAP flag has been introduced, see commit
6aab341e0a28aff100a09831c5300a2994b8b986

Why there's such restriction before 2.6.15, I haven't searched
yet, but any hints would be appreciated.

Thanks
		Franck
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