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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2008-11-06 12:53:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-06 15:41:19 -0800
commita70dcb969f64e2fa98c24f47854f20bf02ff0092 (patch)
tree2224e321ba5d5455fd36ec2cf14f11ff97aa8931 /mm/page_isolation.c
parentc87591b719737b4e91eb1a9fa8fd55a4ff1886d6 (diff)
downloadlinux-a70dcb969f64e2fa98c24f47854f20bf02ff0092.tar.gz
memory hotplug: fix page_zone() calculation in test_pages_isolated()
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>
Diffstat (limited to 'mm/page_isolation.c')
-rw-r--r--mm/page_isolation.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index b70a7fec1ff..5e0ffd96745 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -130,10 +130,11 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
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);