[PATCH 3/4] mm: stop __munlock_pagevec_fill() if THP enounted

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THP is properly handled in munlock_vma_pages_range().

It fixes crashes like this:
 http://lkml.kernel.org/r/565C5C38.3040705@xxxxxxxxxx

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 mm/mlock.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/mlock.c b/mm/mlock.c
index af421d8bd6da..9197b6721a1e 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -393,6 +393,13 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec,
 		if (!page || page_zone_id(page) != zoneid)
 			break;
 
+		/*
+		 * Do not use pagevec for PTE-mapped THP,
+		 * munlock_vma_pages_range() will handle them.
+		 */
+		if (PageTransCompound(page))
+			break;
+
 		get_page(page);
 		/*
 		 * Increase the address that will be returned *before* the
-- 
2.6.4

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