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Date: Tue, 9 Aug 2005 20:41:00 +0100
From: Russell King <rmk+lkml@arm.linux.org.uk>
To: "Martin J. Bligh" <mbligh@mbligh.org>
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>,
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       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
Message-ID: <20050809204100.B29945@flint.arm.linux.org.uk>
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In-Reply-To: <523240000.1123598289@[10.10.2.4]>; from mbligh@mbligh.org on Tue, Aug 09, 2005 at 07:38:52AM -0700
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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.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core