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

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Date:	Thu, 23 Oct 2008 22:37:40 -0700
From:	Keith Packard <keithp@...thp.com>
To:	benh@...nel.crashing.org
Cc:	keithp@...thp.com, Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Fri, 2008-10-24 at 14:24 +1100, Benjamin Herrenschmidt wrote:

> 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...

I'm fine with sticking the mapping in a separate structure; it's just
the return from ioremap_wc on 64-bit systems, and nothing at all on
32-bit systems. I don't really see the advantage of moving it into the
resource, especially as we may need different access modes (UC vs WC)
for different portions of a single BAR.

We may want to add some bounds and access mode information to this
structure to check for broken drivers.

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

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