From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Keith Packard <keithp@keithp.com>,
mingo@elte.hu, nickpiggin@yahoo.com.au, airlied@linux.ie,
linux-kernel@vger.kernel.org, jbarnes@virtuousgeek.org,
dri-devel@lists.sf.net, yinghai@kernel.org
Subject: Re: Adding kmap_atomic_prot_pfn (was: [git pull] drm patches for 2.6.27-rc1)
Date: Fri, 24 Oct 2008 14:21:14 +1100 [thread overview]
Message-ID: <1224818474.7654.429.camel@pasglop> (raw)
In-Reply-To: <alpine.LFD.2.00.0810231424220.3287@nehalem.linux-foundation.org>
On Thu, 2008-10-23 at 14:24 -0700, Linus Torvalds wrote:
> The whole point of that function has absolutely nothing to do with
> highmem, and it *must* be useful on non-highmem configurations to be
> appropriate.
>
> So I'd much rather create a new <linux/kmap.h> or something. Or just
> expose this from to <asm/fixmap.h> or something. Let's not confuse
> this
> with highmem, even if the implementation _historically_ was due to
> that.
Well, on powerpc, we just went (or rather, Kumar just went) through the
oops of implementing fixmap and then kmap on top of it... just because
we wanted kmap_atomic functionality on non-highmem platforms :-) (and
the fixmap approach has some other interesting features).
So yes, I agree. Typically very useful for any 32-bit processor with a
memory mapped PCI Express config space since it's something like 256M of
virtual space to map it all iirc.
Cheers,
Ben.
next prev parent reply other threads:[~2008-10-24 3:22 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-17 21:29 [git pull] drm patches for 2.6.27-rc1 Dave Airlie
2008-10-17 22:43 ` Linus Torvalds
2008-10-18 2:10 ` Eric Anholt
2008-10-18 2:47 ` Linus Torvalds
2008-10-18 3:49 ` Keith Packard
2008-10-18 6:44 ` Corbin Simpson
2008-10-18 7:49 ` Eric Anholt
2008-10-19 17:52 ` Peter Zijlstra
2008-10-20 4:17 ` Steven J Newbury
2008-10-20 16:31 ` Linus Torvalds
2008-10-20 20:04 ` Jesse Barnes
2008-10-18 9:11 ` Dave Airlie
2008-10-18 1:37 ` Nick Piggin
2008-10-18 19:11 ` Keith Packard
2008-10-18 19:31 ` Linus Torvalds
2008-10-18 20:07 ` Thomas Hellström
2008-10-18 20:20 ` Keith Packard
2008-10-18 20:37 ` Ingo Molnar
2008-10-18 21:51 ` Keith Packard
2008-10-18 22:32 ` Ingo Molnar
2008-10-18 22:47 ` Jon Smirl
2008-10-18 22:53 ` Linus Torvalds
2008-10-19 0:38 ` Keith Packard
2008-10-19 1:06 ` Arjan van de Ven
2008-10-19 1:15 ` Keith Packard
2008-10-20 10:01 ` Ingo Molnar
2008-10-19 4:14 ` Keith Packard
2008-10-19 6:41 ` Keith Packard
2008-10-19 17:53 ` io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1) Ingo Molnar
2008-10-19 18:00 ` Arjan van de Ven
2008-10-19 19:07 ` Eric Anholt
2008-10-20 11:55 ` Ingo Molnar
2008-10-20 12:20 ` Ingo Molnar
2008-10-19 21:04 ` Keith Packard
2008-10-20 11:58 ` Ingo Molnar
2008-10-20 15:49 ` Keith Packard
2008-10-22 9:36 ` Ingo Molnar
2008-10-23 7:14 ` Keith Packard
2008-10-23 7:14 ` [PATCH] Add io-mapping functions to dynamically map large device apertures Keith Packard
2008-10-23 7:14 ` [PATCH] [drm/i915] Use io-mapping interfaces instead of a variety of mapping kludges Keith Packard
2008-10-24 4:49 ` [PATCH] Add io-mapping functions to dynamically map large device apertures Randy Dunlap
2008-10-24 6:26 ` Keith Packard
2008-10-23 8:05 ` io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1) Ingo Molnar
2008-10-23 15:39 ` Keith Packard
2008-11-03 7:00 ` Dave Airlie
2008-11-03 10:48 ` Ingo Molnar
2008-11-03 16:36 ` Linus Torvalds
2008-11-03 16:53 ` Ingo Molnar
2008-11-03 17:29 ` [git pull] IO mappings, #2 Ingo Molnar
2008-11-04 22:36 ` Jonathan Corbet
2008-11-05 9:01 ` Ingo Molnar
2008-10-23 20:22 ` Adding kmap_atomic_prot_pfn (was: [git pull] drm patches for 2.6.27-rc1) Keith Packard
2008-10-23 20:38 ` Andrew Morton
2008-10-23 21:03 ` Keith Packard
2008-10-23 21:24 ` Linus Torvalds
2008-10-24 1:50 ` Keith Packard
2008-10-24 2:48 ` Linus Torvalds
2008-10-24 3:24 ` Benjamin Herrenschmidt
2008-10-24 5:37 ` Keith Packard
2008-10-24 14:53 ` Linus Torvalds
2008-10-24 15:45 ` Keith Packard
2008-10-24 4:29 ` Keith Packard
2008-10-24 6:22 ` Keith Packard
2008-10-24 7:33 ` Adding kmap_atomic_prot_pfn Thomas Hellström
2008-10-24 8:38 ` Ingo Molnar
2008-10-24 9:19 ` Thomas Hellström
2008-10-24 9:32 ` Ingo Molnar
2008-10-24 11:04 ` Thomas Hellström
2008-10-24 15:48 ` Keith Packard
2008-10-24 10:18 ` Thomas Hellström
2008-10-24 9:14 ` Adding kmap_atomic_prot_pfn (was: [git pull] drm patches for 2.6.27-rc1) Ingo Molnar
2008-10-24 3:21 ` Benjamin Herrenschmidt [this message]
2008-10-20 10:10 ` io resources and cached mappings " Ingo Molnar
2008-10-19 4:28 ` [git pull] drm patches for 2.6.27-rc1 Yinghai Lu
2008-10-19 3:14 ` Nick Piggin
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