The patch titled
mm/page_alloc: fix the range check for backward merging
has been added to the -mm tree. Its filename is
mm-page_alloc-fix-the-range-check-for-backward-merging.patch
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Subject: mm/page_alloc: fix the range check for backward merging
From: Kazuhisa Ichikawa <ki@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-page_alloc-fix-the-range-check-for-backward-merging mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-fix-the-range-check-for-backward-merging
+++ a/mm/page_alloc.c
@@ -3937,7 +3937,7 @@ void __init add_active_range(unsigned in
}
/* 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;
_
Patches currently in -mm which might be from ki@xxxxxxxxxxx are
mm-page_alloc-fix-the-range-check-for-backward-merging.patch
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