Commit d42ce812 authored by akpm@osdl.org's avatar akpm@osdl.org Committed by Linus Torvalds

[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: default avatarRussell King <rmk@arm.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7a228aaa
......@@ -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);
......
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