From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65C30C433E1 for ; Wed, 19 Aug 2020 18:49:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43941207DE for ; Wed, 19 Aug 2020 18:49:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="b4pHEvLP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726939AbgHSStZ (ORCPT ); Wed, 19 Aug 2020 14:49:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726862AbgHSStJ (ORCPT ); Wed, 19 Aug 2020 14:49:09 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2631FC061342; Wed, 19 Aug 2020 11:49:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=66DP4Pf9efccaQIqwctMuv9XwKLU5wWgwMF4qWqr0Vk=; b=b4pHEvLPG1hkKsnmbfQrrqTHYi VWkIBNDtjyN9c8Z4LmNDcpjHj7yq6xtVSvSuiJUBrLhJ6I96lrnl+ChJ/s76uL2F4feghrlNFAQ1N MsxinyVoKVilyk25tpijsshqsL4+yiO4m5XrhCgIu6pXy0OOAd7tzIkD89C5t7Qz1KUbuj5qz01fd MSmojCrJigJEHzAYVnM3DkoJTYfyYNJlXIZjcizjLjuA9IesPN3cy97gRx00+1QRiJdbmQw8GmnLe IJOGDVShbQY8CWQ6aDu09E/pboQS5RIZ4Q1K2ryIsClNEi9KQZN5QbfFYiHPrEQ9S1eZ6yfVivX38 rEAPV0mw==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1k8T8n-0006Sx-83; Wed, 19 Aug 2020 18:48:53 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton , Hugh Dickins , William Kucharski , Jani Nikula , Alexey Dobriyan , Johannes Weiner , Chris Wilson , Matthew Auld , Huang Ying , intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/8] mm: Use find_get_swap_page in memcontrol Date: Wed, 19 Aug 2020 19:48:44 +0100 Message-Id: <20200819184850.24779-3-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200819184850.24779-1-willy@infradead.org> References: <20200819184850.24779-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current code does not protect against swapoff of the underlying swap device, so this is a bug fix as well as a worthwhile reduction in code complexity. Signed-off-by: Matthew Wilcox (Oracle) --- mm/memcontrol.c | 25 ++----------------------- 1 file changed, 2 insertions(+), 23 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b807952b4d43..4075f214a841 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5539,35 +5539,14 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, static struct page *mc_handle_file_pte(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, swp_entry_t *entry) { - struct page *page = NULL; - struct address_space *mapping; - pgoff_t pgoff; - if (!vma->vm_file) /* anonymous vma */ return NULL; if (!(mc.flags & MOVE_FILE)) return NULL; - mapping = vma->vm_file->f_mapping; - pgoff = linear_page_index(vma, addr); - /* page is moved even if it's not RSS of this task(page-faulted). */ -#ifdef CONFIG_SWAP - /* shmem/tmpfs may report page out on swap: account for that too. */ - if (shmem_mapping(mapping)) { - page = find_get_entry(mapping, pgoff); - if (xa_is_value(page)) { - swp_entry_t swp = radix_to_swp_entry(page); - *entry = swp; - page = find_get_page(swap_address_space(swp), - swp_offset(swp)); - } - } else - page = find_get_page(mapping, pgoff); -#else - page = find_get_page(mapping, pgoff); -#endif - return page; + return find_get_swap_page(vma->vm_file->f_mapping, + linear_page_index(vma, addr)); } /** -- 2.28.0