From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Lameter Subject: [patch 05/23] VM: Allow get_page_unless_zero on compound pages Date: Tue, 06 Nov 2007 17:11:35 -0800 Message-ID: <20071107011227.588177188@sgi.com> References: <20071107011130.382244340@sgi.com> Return-path: Content-Disposition: inline; filename=0011-slab_defrag_get_page_unless.patch Sender: linux-kernel-owner@vger.kernel.org To: akpm@linux-foundatin.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mel Gorman List-Id: linux-mm.kvack.org SLUB uses compound pages for larger slabs. We need to increment the page count of these pages in order to make sure that they are not freed under us because of other operations on the slab that may independently remove the objects. [This patch is already in mm] Reviewed-by: Rik van Riel Signed-off-by: Christoph Lameter --- include/linux/mm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.23-mm1/include/linux/mm.h =================================================================== --- linux-2.6.23-mm1.orig/include/linux/mm.h 2007-10-12 18:15:57.000000000 -0700 +++ linux-2.6.23-mm1/include/linux/mm.h 2007-10-12 18:17:30.000000000 -0700 @@ -227,7 +227,7 @@ static inline int put_page_testzero(stru */ 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); } --