From patchwork Tue Nov 1 22:36:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 9408259 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 3CB5F60721 for ; Tue, 1 Nov 2016 22:37:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2D33729AFF for ; Tue, 1 Nov 2016 22:37:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 20A9129B05; Tue, 1 Nov 2016 22:37:55 +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 C593529AFF for ; Tue, 1 Nov 2016 22:37:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754919AbcKAWhq (ORCPT ); Tue, 1 Nov 2016 18:37:46 -0400 Received: from mx2.suse.de ([195.135.220.15]:37228 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177AbcKAWhj (ORCPT ); Tue, 1 Nov 2016 18:37:39 -0400 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 6CC69ADCD; Tue, 1 Nov 2016 22:37:36 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id ADD0F1E0FC8; Tue, 1 Nov 2016 23:37:27 +0100 (CET) From: Jan Kara To: Cc: , linux-nvdimm@lists.01.org, Andrew Morton , Ross Zwisler , Jan Kara Subject: [PATCH 15/21] mm: Move part of wp_page_reuse() into the single call site Date: Tue, 1 Nov 2016 23:36:24 +0100 Message-Id: <1478039794-20253-19-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.6.6 In-Reply-To: <1478039794-20253-1-git-send-email-jack@suse.cz> References: <1478039794-20253-1-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 wp_page_reuse() handles write shared faults which is needed only in wp_page_shared(). Move the handling only into that location to make wp_page_reuse() simpler and avoid a strange situation when we sometimes pass in locked page, sometimes unlocked etc. Reviewed-by: Ross Zwisler Signed-off-by: Jan Kara --- mm/memory.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index e278a8a6ccc7..06aba4203104 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2103,8 +2103,7 @@ static void fault_dirty_shared_page(struct vm_area_struct *vma, * case, all we need to do here is to mark the page as writable and update * any related book-keeping. */ -static inline int wp_page_reuse(struct vm_fault *vmf, - int page_mkwrite, int dirty_shared) +static inline void wp_page_reuse(struct vm_fault *vmf) __releases(vmf->ptl) { struct vm_area_struct *vma = vmf->vma; @@ -2124,16 +2123,6 @@ static inline int wp_page_reuse(struct vm_fault *vmf, if (ptep_set_access_flags(vma, vmf->address, vmf->pte, entry, 1)) update_mmu_cache(vma, vmf->address, vmf->pte); pte_unmap_unlock(vmf->pte, vmf->ptl); - - if (dirty_shared) { - if (!page_mkwrite) - lock_page(page); - - fault_dirty_shared_page(vma, page); - put_page(page); - } - - return VM_FAULT_WRITE; } /* @@ -2308,7 +2297,8 @@ static int wp_pfn_shared(struct vm_fault *vmf) return 0; } } - return wp_page_reuse(vmf, 0, 0); + wp_page_reuse(vmf); + return VM_FAULT_WRITE; } static int wp_page_shared(struct vm_fault *vmf) @@ -2346,7 +2336,13 @@ static int wp_page_shared(struct vm_fault *vmf) page_mkwrite = 1; } - return wp_page_reuse(vmf, page_mkwrite, 1); + wp_page_reuse(vmf); + if (!page_mkwrite) + lock_page(vmf->page); + fault_dirty_shared_page(vma, vmf->page); + put_page(vmf->page); + + return VM_FAULT_WRITE; } /* @@ -2421,7 +2417,8 @@ static int do_wp_page(struct vm_fault *vmf) page_move_anon_rmap(vmf->page, vma); } unlock_page(vmf->page); - return wp_page_reuse(vmf, 0, 0); + wp_page_reuse(vmf); + return VM_FAULT_WRITE; } unlock_page(vmf->page); } else if (unlikely((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==