From: Rolf Offermanns <roffermanns@sysgo.com>
Organization: SYSGO AG
To: Russell King <rmk+lkml@arm.linux.org.uk>
Subject: Re: mmap + dma_alloc_coherent
Date: Wed, 13 Apr 2005 13:51:52 +0200
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On Wednesday 13 April 2005 13:19, Russell King wrote:
> This has come up before.  ARM implements dma_mmap_*() to allow this
> to happen, but it never got propagated to the other architectures.
I know, this is why I referenced the other LKML threads. What keeps these 
functions from being propagated to the other archs? Are there still 
unresolved issues? (x86 not marking RAM pages reserved would be one I 
assume)?
>
> Here's the (untested) x86 version.  There may be a problem with
> x86 not marking the pages reserved, which is required for
> remap_pfn_range() to work.

So the fact that remap_pfn_range() does not work on pages allocated with 
__get_free_pages() is an x86-only issue? Or is it by design?

-Rolf
-- 
Rolf Offermanns <roffermanns@sysgo.com>
SYSGO AG     Tel.: +49-6136-9948-0
Am Pfaffenstein 14   Fax: +49-6136-9948-10
55270 Klein-Winternheim  http://www.sysgo.com

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