From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752403AbbKKKKH (ORCPT ); Wed, 11 Nov 2015 05:10:07 -0500 Received: from mga14.intel.com ([192.55.52.115]:54840 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752191AbbKKKKF (ORCPT ); Wed, 11 Nov 2015 05:10:05 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,275,1444719600"; d="scan'208";a="847782333" From: "Kirill A. Shutemov" To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [PATCH] mm: fix __page_mapcount() Date: Wed, 11 Nov 2015 12:09:17 +0200 Message-Id: <1447236557-68682-1-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.6.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I made mistake in uninlining patch: we need to read _mapcount of the page which caller pointed us to, not head page. It's fixlet for "mm: uninline slowpath of page_mapcount()" Signed-off-by: Kirill A. Shutemov --- mm/util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/util.c b/mm/util.c index 22dae03a4ae1..5be2a4bdf76b 100644 --- a/mm/util.c +++ b/mm/util.c @@ -411,8 +411,8 @@ int __page_mapcount(struct page *page) { int ret; - page = compound_head(page); ret = atomic_read(&page->_mapcount) + 1; + page = compound_head(page); ret += atomic_read(compound_mapcount_ptr(page)) + 1; if (PageDoubleMap(page)) ret--; -- 2.6.2