Messages in this thread Patch in this message | | | Date | Sun, 3 Jan 2010 21:04:35 +0900 | From | Kazuhisa Ichikawa <> | Subject | [PATCH] mm/page_alloc: fix the range check for backward merging |
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From: Kazuhisa Ichikawa <ki@epsilou.com>
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> --- (This patch applies to linux-2.6.33-rc2)
--- a/mm/page_alloc.c 2009-12-25 06:09:41.000000000 +0900 +++ b/mm/page_alloc.c 2010-01-03 19:20:36.000000000 +0900 @@ -3998,7 +3998,7 @@ 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;
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