From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
I get trouble from lockdep if I leave it enabled:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.34-rc3 #50
-------------------------------------------------------
largepages/4965 is trying to acquire lock:
(events){+.+.+.}, at: [<ffffffff8105b788>] flush_work+0x38/0x130
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff8141b022>] do_page_fault+0xd2/0x430
flush_work apparently wants to run free from lock and it bugs in:
lock_map_acquire(&cwq->wq->lockdep_map);
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
diff --git a/mm/compaction.c b/mm/compaction.c
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -379,7 +379,9 @@ static int compact_zone(struct zone *zon
cc->free_pfn = cc->migrate_pfn + zone->spanned_pages;
cc->free_pfn &= ~(pageblock_nr_pages-1);
+#if 0
migrate_prep();
+#endif
while ((ret = compact_finished(zone, cc)) == COMPACT_INCOMPLETE) {
unsigned long nr_migrate, nr_remaining;
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