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 --- 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 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/