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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2008-11-06 12:53:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-06 15:41:19 -0800 |
| commit | a70dcb969f64e2fa98c24f47854f20bf02ff0092 (patch) | |
| tree | 2224e321ba5d5455fd36ec2cf14f11ff97aa8931 /mm/page_isolation.c | |
| parent | c87591b719737b4e91eb1a9fa8fd55a4ff1886d6 (diff) | |
| download | lwn-a70dcb969f64e2fa98c24f47854f20bf02ff0092.tar.gz lwn-a70dcb969f64e2fa98c24f47854f20bf02ff0092.zip | |
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.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c index b70a7fec1ff6..5e0ffd967452 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); |