Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756272AbbBLQS6 (ORCPT ); Thu, 12 Feb 2015 11:18:58 -0500 Received: from mga03.intel.com ([134.134.136.65]:16061 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755809AbbBLQSz (ORCPT ); Thu, 12 Feb 2015 11:18:55 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.09,565,1418112000"; d="scan'208";a="453749619" From: "Kirill A. Shutemov" To: Andrew Morton , Andrea Arcangeli , Hugh Dickins Cc: Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [PATCHv3 02/24] mm: change PageAnon() and page_anon_vma() to work on tail pages Date: Thu, 12 Feb 2015 18:18:16 +0200 Message-Id: <1423757918-197669-3-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1423757918-197669-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1423757918-197669-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1431 Lines: 43 Currently PageAnon() and page_anon_vma() are always return false/NULL for tail. We need to look on head page for correct answer. Let's change the function to give the correct result for tail page. Signed-off-by: Kirill A. Shutemov --- include/linux/mm.h | 1 + include/linux/rmap.h | 1 + 2 files changed, 2 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 47a93928b90f..9071066b7c2e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1047,6 +1047,7 @@ struct address_space *page_file_mapping(struct page *page) static inline int PageAnon(struct page *page) { + page = compound_head(page); return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; } diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 9c5ff69fa0cd..c4088feac1fc 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -108,6 +108,7 @@ static inline void put_anon_vma(struct anon_vma *anon_vma) static inline struct anon_vma *page_anon_vma(struct page *page) { + page = compound_head(page); if (((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON) return NULL; -- 2.1.4 -- 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/