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=-6.0 required=3.0 tests=BAYES_00,DATE_IN_PAST_12_24, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no 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 8DF14C433E1 for ; Sat, 15 Aug 2020 22:11:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47A0A20768 for ; Sat, 15 Aug 2020 22:11:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597529502; bh=4gUH5r9Rmyz4qBoRBb3or7wxet4s+5ZjYSJEvmCHUD4=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=SddCKoSwyqVMpJt4xNUUELTaXpu8jcGtUt3+dFWnTDz+ODlZKd6Phv8mmMY5pD8E0 ys5E7ZKaQdLjllS42DoIXXBkDWse9pZp3Mpk26fXBk4GMMvxlMh9nFOxc6jO0IqEQn zP378f4j/QeS6/d8R6/umiVZSOnzMwJ+sIoAxg0M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729453AbgHOWLh (ORCPT ); Sat, 15 Aug 2020 18:11:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:41764 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729432AbgHOWKa (ORCPT ); Sat, 15 Aug 2020 18:10:30 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A003522B4E; Sat, 15 Aug 2020 00:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597451441; bh=4gUH5r9Rmyz4qBoRBb3or7wxet4s+5ZjYSJEvmCHUD4=; h=Date:From:To:Subject:In-Reply-To:From; b=zR2JFeg0N9WmFUie4nqi0Cy//8WBEvuztRwK2M+pFHFJk2qrY+cAXqU4ZOJJMUEmc 4EPwK0DbGMQrje1lNM+9jawXcE15GNRzaMOc9TPSPtua5rRMCvICIPAgypxlTSPzy0 6kusoqzspLjkmPqDGbw2+X4qyytyki8D4zVXm6wA= Date: Fri, 14 Aug 2020 17:30:40 -0700 From: Andrew Morton To: akpm@linux-foundation.org, david@redhat.com, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, william.kucharski@oracle.com, willy@infradead.org, ziy@nvidia.com Subject: [patch 12/39] mm: add thp_head Message-ID: <20200815003040.fakiVe6j8%akpm@linux-foundation.org> In-Reply-To: <20200814172939.55d6d80b6e21e4241f1ee1f3@linux-foundation.org> User-Agent: s-nail v14.8.16 Sender: mm-commits-owner@vger.kernel.org Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "Matthew Wilcox (Oracle)" Subject: mm: add thp_head This is like compound_head() but compiles away when CONFIG_TRANSPARENT_HUGEPAGE is not enabled. Link: http://lkml.kernel.org/r/20200629151959.15779-7-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: William Kucharski Reviewed-by: Zi Yan Cc: David Hildenbrand Cc: Mike Kravetz Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton --- include/linux/huge_mm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) --- a/include/linux/huge_mm.h~mm-add-thp_head +++ a/include/linux/huge_mm.h @@ -260,6 +260,15 @@ static inline spinlock_t *pud_trans_huge } /** + * thp_head - Head page of a transparent huge page. + * @page: Any page (tail, head or regular) found in the page cache. + */ +static inline struct page *thp_head(struct page *page) +{ + return compound_head(page); +} + +/** * thp_order - Order of a transparent huge page. * @page: Head page of a transparent huge page. */ @@ -335,6 +344,12 @@ static inline struct list_head *page_def #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) +static inline struct page *thp_head(struct page *page) +{ + VM_BUG_ON_PGFLAGS(PageTail(page), page); + return page; +} + static inline unsigned int thp_order(struct page *page) { VM_BUG_ON_PGFLAGS(PageTail(page), page); _