From 1b3cb73f7306f97a68fa973dec9f3c3b68bd29cf Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Thu, 15 Sep 2005 15:17:59 +0100
Subject: [PATCH] [ARM] Tighten pfn_valid() test.

Thomas Gleixner reported that mmaping and unmapping each physical
page in turn eventually caused the kernel to oops.  It appears
that pfn_valid() in the discontigmem case was too simplistic for
proper operation.

Tighten the logic so we also check if the PFN is within the range
of the selected memory node.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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