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[PATCH] arm: add comment about max_low_pfn/max_pfn

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From: 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org 2005-04-16 15:23:57 -07:00 committed by Linus Torvalds
parent 7a228aaa87
commit d42ce812b8
1 changed files with 3 additions and 0 deletions
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3
arch/arm/mm/init.c
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@ -223,6 +223,9 @@ find_memend_and_nodes(struct meminfo *mi, struct node_info *np)
* 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);