This is needed by slab defragmentation. The refcount of a page head
may be incremented to ensure that a compound page will not go away under us.
It also may be needed for defragmentation of higher order pages. The
moving of compound pages may require the establishment of a reference
before the use of page migration functions.
Signed-off-by: Christoph Lameter <[email protected]>
---
include/linux/mm.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6f3a8d6..a8a0378 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -290,7 +290,7 @@ static inline int put_page_testzero(struct page *page)
*/
static inline int get_page_unless_zero(struct page *page)
{
- VM_BUG_ON(PageCompound(page));
+ VM_BUG_ON(PageTail(page));
return atomic_inc_not_zero(&page->_count);
}
--
1.5.2.5
--
-
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