Re: Adding kmap_atomic_prot_pfn (was: [git pull] drm patches for2.6.27-rc1)

From: Keith Packard
Date: Thu Oct 23 2008 - 17:04:45 EST

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.


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