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

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Date:	Fri, 24 Oct 2008 14:24:05 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Keith Packard <keithp@...thp.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, nickpiggin@...oo.com.au,
	airlied@...ux.ie,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jbarnes@...tuousgeek.org, dri-devel@...ts.sf.net,
	yinghai@...nel.org, Peter Anvin <hpa@...or.com>
Subject: Re: Adding kmap_atomic_prot_pfn  (was: [git pull] drm patches for
	2.6.27-rc1)

On Thu, 2008-10-23 at 19:48 -0700, Linus Torvalds wrote:
> Then, there's the issue of 64-bit, and just mapping everything there, and 
> the interface to that. I liked the trivial extension to "struct resource" 
> to have a "cached mapping" pointer. So if we can just make it pass 
> resources around and get a page that way (and not even need kmap() on 
> 64-bit architections), that would be good.

I'm not that fan of carrying a mapping with a struct resource because if
we do that we should probably also refcount the mapping, and then there
is the whole question of mappings with different attributes, etc etc...

Cheers,
Ben.


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