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| author | Yasunori Goto <y-goto@jp.fujitsu.com> | 2006-05-30 21:25:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-31 16:27:10 -0700 |
| commit | 25a6df952542ad9f284421b6ffe28f3eb3df1305 (patch) | |
| tree | 8b0649ff83f5455fcca4f255bf2189a5cbf81fc8 | |
| parent | 308af9290ad1844c1b4e93ff4919f8009efbe018 (diff) | |
| download | lwn-25a6df952542ad9f284421b6ffe28f3eb3df1305.tar.gz lwn-25a6df952542ad9f284421b6ffe28f3eb3df1305.zip | |
[PATCH] spanned_pages is not updated at a case of memory hot-add
From: Yasunori Goto <y-goto@jp.fujitsu.com>
If hot-added memory's address is smaller than old area, spanned_pages will
not be updated. It must be fixed.
example) Old zone_start_pfn = 0x60000, and spanned_pages = 0x10000
Added new memory's start_pfn = 0x50000, and end_pfn = 0x60000
new spanned_pages will be still 0x10000 by old code.
(It should be updated to 0x20000.) Because old_zone_end_pfn will be
0x70000, and end_pfn smaller than it. So, spanned_pages will not be
updated.
In current code, spanned_pages is updated only when end_pfn is updated.
But, it should be updated by subtraction between bigger end_pfn and new
zone_start_pfn.
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | mm/memory_hotplug.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 1ae2b2cc3a54..70df5c0d957e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -91,8 +91,8 @@ static void grow_zone_span(struct zone *zone, if (start_pfn < zone->zone_start_pfn) zone->zone_start_pfn = start_pfn; - if (end_pfn > old_zone_end_pfn) - zone->spanned_pages = end_pfn - zone->zone_start_pfn; + zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - + zone->zone_start_pfn; zone_span_writeunlock(zone); } @@ -106,8 +106,8 @@ static void grow_pgdat_span(struct pglist_data *pgdat, if (start_pfn < pgdat->node_start_pfn) pgdat->node_start_pfn = start_pfn; - if (end_pfn > old_pgdat_end_pfn) - pgdat->node_spanned_pages = end_pfn - pgdat->node_start_pfn; + pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - + pgdat->node_start_pfn; } int online_pages(unsigned long pfn, unsigned long nr_pages) |