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mm/page_alloc: fix the range check for backward merging 

The current check for 'backward merging' within add_active_range() does
not seem correct.  start_pfn must be compared against
early_node_map[i].start_pfn (and NOT against .end_pfn) to find out whether
the new region is backward-mergeable with the existing range.

Signed-off-by: Kazuhisa Ichikawa <ki@epsilou.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kazuhisa Ichikawa 2010-01-15 17:01:20 -08:00 committed by Linus Torvalds
parent 5dab600e6a
commit d2dbe08ddc
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -3998,7 +3998,7 @@ void __init add_active_range(unsigned int nid, unsigned long start_pfn,
}
/* Merge backward if suitable */
if (start_pfn < early_node_map[i].end_pfn &&
if (start_pfn < early_node_map[i].start_pfn &&
end_pfn >= early_node_map[i].start_pfn) {
early_node_map[i].start_pfn = start_pfn;
return;