From patchwork Fri Jul 22 12:19:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 9243445 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 80AB0602F0 for ; Fri, 22 Jul 2016 12:20:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 720A4266F3 for ; Fri, 22 Jul 2016 12:20:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 66B0727FA5; Fri, 22 Jul 2016 12:20:02 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A35A266F3 for ; Fri, 22 Jul 2016 12:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753982AbcGVMT6 (ORCPT ); Fri, 22 Jul 2016 08:19:58 -0400 Received: from mx2.suse.de ([195.135.220.15]:49620 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753876AbcGVMTy (ORCPT ); Fri, 22 Jul 2016 08:19:54 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 1703EAD61; Fri, 22 Jul 2016 12:19:51 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id A8BAA1E0F28; Fri, 22 Jul 2016 14:19:47 +0200 (CEST) From: Jan Kara To: linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org, Dan Williams , Ross Zwisler , Jan Kara Subject: [PATCH 08/15] mm: Export follow_pte() Date: Fri, 22 Jul 2016 14:19:34 +0200 Message-Id: <1469189981-19000-9-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.6.6 In-Reply-To: <1469189981-19000-1-git-send-email-jack@suse.cz> References: <1469189981-19000-1-git-send-email-jack@suse.cz> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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 --- include/linux/mm.h | 2 ++ mm/memory.c | 5 +++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index d2f2816d78ca..daf690fccc0c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1191,6 +1191,8 @@ 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 cfae2d5cc1e0..6780e5d8145c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3635,8 +3635,8 @@ 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; @@ -3645,6 +3645,7 @@ static inline int follow_pte(struct mm_struct *mm, unsigned long address, !(res = __follow_pte(mm, address, ptepp, ptlp))); return res; } +EXPORT_SYMBOL(follow_pte); /** * follow_pfn - look up PFN at a user virtual address