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authorKazuhisa Ichikawa <ki@epsilou.com>2010-01-15 17:01:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-16 12:15:38 -0800
commitd2dbe08ddceb4ba2b274abb84326d7e69d454e5c (patch)
tree7b363c03dc6441b3fe6ebdcacd892cbd09b04f29 /mm
parent5dab600e6a153ceb64832f608069e6c08185411a (diff)
downloadlinux-linaro-stable-d2dbe08ddceb4ba2b274abb84326d7e69d454e5c.tar.gz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4e9f5cc5fb59..6ea4966a6334 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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;