Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031428AbdI0ELj (ORCPT ); Wed, 27 Sep 2017 00:11:39 -0400 Received: from mga09.intel.com ([134.134.136.24]:27538 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754386AbdI0ELj (ORCPT ); Wed, 27 Sep 2017 00:11:39 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,443,1500966000"; d="scan'208";a="132701575" From: changbin.du@intel.com To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Changbin Du Subject: [PATCH v2] mm: update comments for struct page.mapping Date: Wed, 27 Sep 2017 12:04:27 +0800 Message-Id: <1506485067-15954-1-git-send-email-changbin.du@intel.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 976 Lines: 32 From: Changbin Du The struct page.mapping can NULL or points to one object of type address_space, anon_vma or KSM private structure. Signed-off-by: Changbin Du --- v2: add back flag reference. --- include/linux/mm_types.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 46f4ecf5..6d4c51a 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -47,8 +47,10 @@ struct page { * inode address_space, or NULL. * If page mapped as anonymous * memory, low bit is set, and - * it points to anon_vma object: - * see PAGE_MAPPING_ANON below. + * it points to anon_vma object + * or KSM private structure. See + * PAGE_MAPPING_ANON and + * PAGE_MAPPING_KSM. */ void *s_mem; /* slab first object */ atomic_t compound_mapcount; /* first tail page */ -- 2.7.4