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 66B4CC433E1 for ; Wed, 19 Aug 2020 18:49:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46FAC207DE for ; Wed, 19 Aug 2020 18:49:47 +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="QBZEY6GN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726976AbgHSStp (ORCPT ); Wed, 19 Aug 2020 14:49:45 -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 S1726820AbgHSStG (ORCPT ); Wed, 19 Aug 2020 14:49:06 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09EADC061342; Wed, 19 Aug 2020 11:49:05 -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=7+YSI5YaFA7nV1yaE7i/RW3xZbJtF/8x3LDr4io57Q8=; b=QBZEY6GNdSOmnF4ujehB7tIL/+ 8WlFkWpSxuLPFzkGOnnhlBlJavyO4Z+T0yXOfXgJgAGvoDk+Cf1m8ak9wPM8AkhSIMWn8nFA51xkD WHXh1JSEJrwxa10n1dsaReCF4jaEG4ACDpvQROgOqopHoed3BHKh9cV153/2lHtDBdHzNGvzALDwt xhCJjd4YgCOtHb28bEt8UYDUq80/QJIuQXJRj9csQ+VHnOkdnIJ+SSvdZLDIr692dGd7QtGw5TKT0 kT9IZJattIKOxBcoS1wr/w22x9PoXKBXAMBPZyBB/EKkYK4S922ZQv2l+P8miuoSBxQIRrrF5OJXs 10W3+YmQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1k8T8q-0006UR-DL; Wed, 19 Aug 2020 18:48:56 +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 8/8] mm: Hoist find_subpage call further up in pagecache_get_page Date: Wed, 19 Aug 2020 19:48:50 +0100 Message-Id: <20200819184850.24779-9-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 This avoids a call to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) --- mm/filemap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 6594baae7cd2..8c354277108d 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1667,7 +1667,6 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index, page = NULL; if (!page) goto no_page; - page = find_subpage(page, index); if (fgp_flags & FGP_LOCK) { if (fgp_flags & FGP_NOWAIT) { @@ -1680,12 +1679,12 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index, } /* Has the page been truncated? */ - if (unlikely(compound_head(page)->mapping != mapping)) { + if (unlikely(page->mapping != mapping)) { unlock_page(page); put_page(page); goto repeat; } - VM_BUG_ON_PAGE(page->index != index, page); + VM_BUG_ON_PAGE(!thp_valid_index(page, index), page); } if (fgp_flags & FGP_ACCESSED) @@ -1695,6 +1694,7 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index, if (page_is_idle(page)) clear_page_idle(page); } + page = find_subpage(page, index); no_page: if (!page && (fgp_flags & FGP_CREAT)) { -- 2.28.0