From: "Martin J. Bligh" <mbligh@mbligh.org>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
ncunningham@cyclades.com, Daniel Phillips <phillips@arcor.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>,
Hugh Dickins <hugh@veritas.com>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
Andrea Arcangeli <andrea@suse.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [RFC][patch 0/2] mm: remove PageReserved
Date: Tue, 09 Aug 2005 14:16:37 -0700 [thread overview]
Message-ID: <1162240000.1123622197@flay> (raw)
In-Reply-To: <20050809204100.B29945@flint.arm.linux.org.uk>
--On Tuesday, August 09, 2005 20:41:00 +0100 Russell King <rmk+lkml@arm.linux.org.uk> wrote:
> On Tue, Aug 09, 2005 at 07:38:52AM -0700, Martin J. Bligh wrote:
>> pfn_valid() doesn't tell you it's RAM or not - it tells you whether you
>> have a backing struct page for that address. Could be an IO mapped device,
>> a small memory hole, whatever.
>
> The only things which have a struct page is RAM. Nothing else does.
That's not true at all. Every physical address covered by the machine
that we may need to access, plus every small hole we didn't use
discontigmem to exclude has a backing struct page. See e820 maps.
Unless you're speaking only with respect to ARM, in which case, I'll
bow to your knowledge, but it's certainly not true in general ...
M.
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next prev parent reply other threads:[~2005-08-09 21:16 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-07 3:28 Nick Piggin
2005-08-07 3:29 ` [patch 1/2] mm: remap ZERO_PAGE mappings Nick Piggin
2005-08-07 3:30 ` [patch 2/2] mm: core remove PageReserved Nick Piggin
2005-08-08 21:09 ` [RFC][patch 0/2] mm: " Daniel Phillips
2005-08-08 21:24 ` Daniel Phillips
2005-08-08 21:54 ` Andrew Morton
2005-08-09 23:23 ` [RFC][PATCH] Rename PageChecked as PageMiscFS Daniel Phillips
2005-08-10 7:48 ` Hugh Dickins
2005-08-10 8:06 ` Daniel Phillips
2005-08-10 22:12 ` Daniel Phillips
2005-08-10 22:23 ` Daniel Phillips
2005-08-10 22:34 ` Trond Myklebust
2005-08-10 22:57 ` Daniel Phillips
2005-08-10 23:23 ` Trond Myklebust
2005-08-11 9:42 ` David Howells
2005-08-10 23:42 ` Adrian Bunk
2005-08-11 9:46 ` David Howells
2005-08-12 2:34 ` Daniel Phillips
2005-08-12 12:32 ` David Howells
2005-08-11 9:31 ` David Howells
2005-08-11 9:26 ` David Howells
2005-08-12 3:29 ` Daniel Phillips
2005-08-12 12:41 ` David Howells
2005-08-12 13:28 ` Hugh Dickins
2005-08-16 13:59 ` Pavel Machek
2005-08-18 14:33 ` David Howells
2005-08-18 22:27 ` Pavel Machek
2005-08-19 10:04 ` David Howells
2005-08-19 16:31 ` Daniel Phillips
2005-08-20 10:45 ` David Howells
2005-08-20 20:21 ` Daniel Phillips
2005-08-10 13:13 ` [RFC][patch 0/2] mm: remove PageReserved David Howells
2005-08-10 13:34 ` Daniel Phillips
2005-08-10 14:27 ` David Howells
2005-08-10 23:19 ` Daniel Phillips
2005-08-11 10:49 ` David Howells
2005-08-12 19:34 ` Daniel Phillips
2005-08-15 13:15 ` David Howells
2005-08-16 1:53 ` Daniel Phillips
2005-08-16 10:28 ` David Howells
2005-08-09 0:15 ` Nick Piggin
2005-08-09 8:51 ` Benjamin Herrenschmidt
2005-08-09 9:49 ` Nick Piggin
2005-08-09 19:19 ` Daniel Phillips
2005-08-09 19:22 ` Daniel Phillips
2005-08-10 21:50 ` Pavel Machek
2005-08-10 21:56 ` Martin J. Bligh
2005-08-11 10:36 ` Rafael J. Wysocki
2005-08-12 19:56 ` Daniel Phillips
2005-08-12 22:20 ` Rafael J. Wysocki
2005-08-12 23:04 ` Daniel Phillips
2005-08-13 7:06 ` Rafael J. Wysocki
2005-08-11 10:26 ` Rafael J. Wysocki
2005-08-09 11:25 ` Hugh Dickins
2005-08-09 14:31 ` Benjamin Herrenschmidt
2005-08-09 14:50 ` Hugh Dickins
2005-08-09 14:49 ` Benjamin Herrenschmidt
2005-08-09 15:36 ` Hugh Dickins
2005-08-09 21:27 ` Daniel Phillips
2005-08-09 19:14 ` Daniel Phillips
2005-08-09 20:17 ` Hugh Dickins
2005-08-09 20:52 ` Daniel Phillips
2005-08-09 4:39 ` Nigel Cunningham
2005-08-09 4:59 ` Nick Piggin
2005-08-09 5:11 ` Nigel Cunningham
2005-08-09 5:20 ` Nick Piggin
2005-08-09 5:30 ` Nigel Cunningham
2005-08-09 7:08 ` Russell King
2005-08-09 8:38 ` Arjan van de Ven
2005-08-09 9:31 ` Nick Piggin
2005-08-09 9:49 ` Arjan van de Ven
2005-08-09 9:57 ` Nick Piggin
2005-08-09 10:24 ` Rafael J. Wysocki
2005-08-09 8:53 ` Benjamin Herrenschmidt
2005-08-09 9:15 ` Hugh Dickins
2005-08-09 10:27 ` Nick Piggin
2005-08-09 11:15 ` Hugh Dickins
2005-08-09 13:15 ` Nick Piggin
2005-08-09 13:26 ` Arjan van de Ven
2005-08-09 14:28 ` Benjamin Herrenschmidt
2005-08-09 14:47 ` Hugh Dickins
2005-08-09 19:49 ` Roman Zippel
2005-08-09 9:29 ` Nick Piggin
2005-08-09 19:40 ` Russell King
2005-08-09 14:38 ` Martin J. Bligh
2005-08-09 19:41 ` Russell King
2005-08-09 20:51 ` Linus Torvalds
2005-08-09 21:16 ` Martin J. Bligh [this message]
2005-08-09 21:51 ` Martin J. Bligh
2005-08-10 9:27 ` Benjamin Herrenschmidt
2005-08-11 9:09 ` Nick Piggin
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