[PATCH] Add comment about max_low_pfn/max_pfn

[Russell King <rmk+lkml@arm.linux.org.uk>]

Oddly, max_low_pfn/max_pfn end up being the number of pages
in the system, rather than the maximum PFN on ARM.  This
doesn't seem to cause any problems, so just add a note about
it.

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

diff -up -x BitKeeper -x ChangeSet -x SCCS -x _xlk -x '*.orig' -x '*.rej' -r orig/arch/arm/mm/init.c linux/arch/arm/mm/init.c
--- orig/arch/arm/mm/init.c	Sat Mar 19 11:20:00 2005
+++ linux/arch/arm/mm/init.c	Mon Apr 11 14:06:10 2005
@@ -223,6 +223,9 @@ find_memend_and_nodes(struct meminfo *mi
 	 * This doesn't seem to be used by the Linux memory
 	 * manager any more.  If we can get rid of it, we
 	 * also get rid of some of the stuff above as well.
+	 *
+	 * Note: max_low_pfn and max_pfn reflect the number
+	 * of _pages_ in the system, not the maximum PFN.
 	 */
 	max_low_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
 	max_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);