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

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Message-ID: <alpine.LFD.2.00.0810240752300.3287@nehalem.linux-foundation.org>
Date:	Fri, 24 Oct 2008 07:53:59 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Keith Packard <keithp@...thp.com>
cc:	benh@...nel.crashing.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 Thu, 23 Oct 2008, Keith Packard wrote:
> 
> 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.

Actually, on 32-bit, the 'prot' should be there, as should the starting 
physical page. Otherwise the two interfaces would be very odd, and you'd 
have to repeat those arguments in all callers (ie both in "prepare" and 
in the actual "access").

			Linus
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