From patchwork Tue Sep 27 16:08:21 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 9352271 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E04BA600CB for ; Tue, 27 Sep 2016 16:08:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D29CF28979 for ; Tue, 27 Sep 2016 16:08:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C73442929E; Tue, 27 Sep 2016 16:08:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=2.0 tests=BAYES_50, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 14C5128979 for ; Tue, 27 Sep 2016 16:08:53 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id B61481A1E9F; Tue, 27 Sep 2016 09:08:41 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 523361A1E30 for ; Tue, 27 Sep 2016 09:08:37 -0700 (PDT) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id AE4BB7502D; Tue, 27 Sep 2016 16:08:32 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 1AB751E11B5; Tue, 27 Sep 2016 18:08:31 +0200 (CEST) From: Jan Kara To: linux-mm@kvack.org Subject: [PATCH 17/20] mm: Export follow_pte() Date: Tue, 27 Sep 2016 18:08:21 +0200 Message-Id: <1474992504-20133-18-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.6.6 In-Reply-To: <1474992504-20133-1-git-send-email-jack@suse.cz> References: <1474992504-20133-1-git-send-email-jack@suse.cz> X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jan Kara , linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, "Kirill A. Shutemov" MIME-Version: 1.0 Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP DAX will need to implement its own version of page_check_address(). To avoid duplicating page table walking code, export follow_pte() which does what we need. Signed-off-by: Jan Kara Reviewed-by: Ross Zwisler --- include/linux/mm.h | 2 ++ mm/memory.c | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index e5a014be8932..133fabe4bb4c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1224,6 +1224,8 @@ int copy_page_range(struct mm_struct *dst, struct mm_struct *src, struct vm_area_struct *vma); void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows); +int follow_pte(struct mm_struct *mm, unsigned long address, pte_t **ptepp, + spinlock_t **ptlp); int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn); int follow_phys(struct vm_area_struct *vma, unsigned long address, diff --git a/mm/memory.c b/mm/memory.c index 8c8cb7f2133e..e7a4a30a5e88 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3763,8 +3763,8 @@ out: return -EINVAL; } -static inline int follow_pte(struct mm_struct *mm, unsigned long address, - pte_t **ptepp, spinlock_t **ptlp) +int follow_pte(struct mm_struct *mm, unsigned long address, pte_t **ptepp, + spinlock_t **ptlp) { int res;