* [PATCH] mm/page_alloc: fix the range check for backward merging
@ 2010-01-03 12:04 Kazuhisa Ichikawa
2010-01-04 21:02 ` David Rientjes
0 siblings, 1 reply; 2+ messages in thread
From: Kazuhisa Ichikawa @ 2010-01-03 12:04 UTC (permalink / raw)
To: linux-mm; +Cc: linux-kernel
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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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] mm/page_alloc: fix the range check for backward merging
2010-01-03 12:04 [PATCH] mm/page_alloc: fix the range check for backward merging Kazuhisa Ichikawa
@ 2010-01-04 21:02 ` David Rientjes
0 siblings, 0 replies; 2+ messages in thread
From: David Rientjes @ 2010-01-04 21:02 UTC (permalink / raw)
To: Andrew Morton, Kazuhisa Ichikawa; +Cc: linux-mm, linux-kernel
On Sun, 3 Jan 2010, Kazuhisa Ichikawa wrote:
> 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;
Acked-by: David Rientjes <rientjes@google.com>
--
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^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-01-03 12:04 [PATCH] mm/page_alloc: fix the range check for backward merging Kazuhisa Ichikawa
2010-01-04 21:02 ` David Rientjes
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