linux-kernel - Re: Adding kmap_atomic_prot_pfn (was: [git pull] drm patches for 2.6.27-rc1)

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Message-Id: <1224795825.22877.21.camel@koto.keithp.com>
Date:	Thu, 23 Oct 2008 14:03:45 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	keithp@...thp.com, mingo@...e.hu, nickpiggin@...oo.com.au,
	airlied@...ux.ie, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org,
	dri-devel@...ts.sf.net, yinghai@...nel.org
Subject: Re: Adding kmap_atomic_prot_pfn  (was: [git pull] drm patches for
	2.6.27-rc1)

On Thu, 2008-10-23 at 13:38 -0700, Andrew Morton wrote:

> I guess one could reimplemenet kmap_atomic_pfn() to call this.  Sometime.

The goal is to stop needing this function fairly soon and replace it
with a 'real' io-mapping implementation for 32-bit processors.

> Given that all highmem-implementing archtiectures must use the same
> declaration here, we might as well put it into include/linux/highmem.h.
> Although that goes against current mistakes^Wcode.

I'd hate to break with a long tradition.

> Does powerpc32 still implement highmem?  It seems that way.  You broke
> it, no?

Powerpc32 doesn't have kmap_atomic_pfn either. Seems like the set of
HIGHMEM functions is not uniform across architectures.

-- 
keith.packard@...el.com

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