linux-kernel - Re: Mapping non-page aligned data to user

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Message-Id: <E1LVN4j-0001Iz-OD@be1.7eggert.dyndns.org>
Date:	Fri, 06 Feb 2009 10:32:41 +0100
From:	Bodo Eggert <7eggert@....de>
To:	Vira <sri1369_s@...oo.com>, linux-kernel@...r.kernel.org
Subject: Re: Mapping non-page aligned data to user

Vira <sri1369_s@...oo.com> wrote:

> Is there a way to map a non-page aligned kernel physical address to user
> virtual address? remap_pfn_range and vm_insert_page operate only on
> page-aligned physical addresses.
> 
> If there is no such support, would it be too complicated to try out
> writing something on my own to map non-page aligned addresses (the data
> size is under my control - so I can make that a multiple of page size)?
> 
> Any suggestions appreciated.

It can only be done using segmented memory, and you don't want that.

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