Messages in this thread Patch in this message |  | | | Date | Fri, 14 Nov 2008 21:23:52 -0800 | | From | Greg KH <> | | Subject | [patch 20/22] memory hotplug: fix page_zone() calculation in test_pages_isolated() | |
2.6.27-stable review patch. If anyone has any objections, please let us know.
------------------
From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
commit a70dcb969f64e2fa98c24f47854f20bf02ff0092 upstream.
My last bugfix here (adding zone->lock) introduced a new problem: Using
page_zone(pfn_to_page(pfn)) to get the zone after the for() loop is wrong.
pfn will then be >= end_pfn, which may be in a different zone or not
present at all. This may lead to an addressing exception in page_zone()
or spin_lock_irqsave().
Now I use __first_valid_page() again after the loop to find a valid page
for page_zone().
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Acked-by: Nathan Fontenot <nfont@austin.ibm.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
mm/page_isolation.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -130,10 +130,11 @@ int test_pages_isolated(unsigned long st
if (page && get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
break;
}
- if (pfn < end_pfn)
+ page = __first_valid_page(start_pfn, end_pfn - start_pfn);
+ if ((pfn < end_pfn) || !page)
return -EBUSY;
/* Check all pages are free or Marked as ISOLATED */
- zone = page_zone(pfn_to_page(pfn));
+ zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn);
spin_unlock_irqrestore(&zone->lock, flags);
--
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