From patchwork Tue Jun 21 15:45:14 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 9190855 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 30C416089F for ; Tue, 21 Jun 2016 15:45:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 201CE281DB for ; Tue, 21 Jun 2016 15:45:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 152F92823D; Tue, 21 Jun 2016 15:45:28 +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=-1.9 required=2.0 tests=BAYES_00, 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 04173281DB for ; Tue, 21 Jun 2016 15:45:26 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id AD7341A1E51; Tue, 21 Jun 2016 08:45:55 -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 4F8921A1E52 for ; Tue, 21 Jun 2016 08:45:54 -0700 (PDT) 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 C3F61AD32; Tue, 21 Jun 2016 15:45:22 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id E6C5B1E0ECE; Tue, 21 Jun 2016 17:45:21 +0200 (CEST) From: Jan Kara To: linux-nvdimm@lists.01.org Subject: [PATCH 2/3] mm: Export follow_pte() Date: Tue, 21 Jun 2016 17:45:14 +0200 Message-Id: <1466523915-14644-3-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.6.6 In-Reply-To: <1466523915-14644-1-git-send-email-jack@suse.cz> References: <1466523915-14644-1-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: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Jan Kara 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 check_page_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 5df5feb49575..989f5d949db3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1193,6 +1193,8 @@ 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 15322b73636b..f6175d63c2e9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3647,8 +3647,8 @@ 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; @@ -3657,6 +3657,7 @@ 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