From patchwork Wed May 5 15:05:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12240303 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 84E27C43461 for ; Wed, 5 May 2021 15:58:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 662D8613BF for ; Wed, 5 May 2021 15:58:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233627AbhEEP7q (ORCPT ); Wed, 5 May 2021 11:59:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230281AbhEEP7q (ORCPT ); Wed, 5 May 2021 11:59:46 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54CE6C061574; Wed, 5 May 2021 08:58:49 -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=XX7WlZLUVRG3S89p8YK7xOJIbSQs/CkgLGJSAS8+DyI=; b=bHMD4P6ej4G1RUIz1sSgK4fs0f 9pW+eglMeqveEP4bWV6nICp3pc9Q8wsDNLIKa9BjaYkY02kZMVmUaWwgyYlgszNxr7aVxYH8PvCSs yZrEllcJwHVwvoj7yfQCO6ciG5q1jU6vgQ5vGu5Bw6wYlqYqrnWGPIs2VsJdiWpQsjfkSja8rQlFw 35LiKkbWQbYa9/GV27p9LiMMIaC9U1XyaTuMsMTBqiWL+nTOlEXE6CieVpnTvqqss7s58WDCyBBXz ZDdYJ6nJJC3nlKA+8mPK2TeOJBE6V6hO060timN5s0C4L5KkGntYveL6DiodeexFufFFJ0eHOhjPX l5mRzhyw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1leJtj-000XSV-Ht; Wed, 05 May 2021 15:57:37 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v9 40/96] mm: Add folio_mapped Date: Wed, 5 May 2021 16:05:32 +0100 Message-Id: <20210505150628.111735-41-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210505150628.111735-1-willy@infradead.org> References: <20210505150628.111735-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This function is the equivalent of page_mapped(). It is slightly shorter as we do not need to handle the PageTail() case. Reimplement page_mapped() as a wrapper around folio_mapped(). Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/mm.h | 1 + mm/folio-compat.c | 6 ++++++ mm/util.c | 30 +++++++++++++++++------------- 3 files changed, 24 insertions(+), 13 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index bca3e2518e5e..6bfc43309e4b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1779,6 +1779,7 @@ static inline pgoff_t page_index(struct page *page) } bool page_mapped(struct page *page); +bool folio_mapped(struct folio *folio); /* * Return true only if the page has been allocated with diff --git a/mm/folio-compat.c b/mm/folio-compat.c index 3c83f03b80d7..7044fcc8a8aa 100644 --- a/mm/folio-compat.c +++ b/mm/folio-compat.c @@ -35,3 +35,9 @@ void wait_for_stable_page(struct page *page) return folio_wait_stable(page_folio(page)); } EXPORT_SYMBOL_GPL(wait_for_stable_page); + +bool page_mapped(struct page *page) +{ + return folio_mapped(page_folio(page)); +} +EXPORT_SYMBOL(page_mapped); diff --git a/mm/util.c b/mm/util.c index afd99591cb81..e60b0920f9a7 100644 --- a/mm/util.c +++ b/mm/util.c @@ -652,28 +652,32 @@ void *page_rmapping(struct page *page) return __page_rmapping(page); } -/* - * Return true if this page is mapped into pagetables. - * For compound page it returns true if any subpage of compound page is mapped. +/** + * folio_mapped - Is this folio mapped into userspace? + * @folio: The folio. + * + * Return: true if any page in this folio is mapped into pagetables. */ -bool page_mapped(struct page *page) +bool folio_mapped(struct folio *folio) { - int i; + int i, nr; - if (likely(!PageCompound(page))) - return atomic_read(&page->_mapcount) >= 0; - page = compound_head(page); - if (atomic_read(compound_mapcount_ptr(page)) >= 0) + if (folio_single(folio)) + return atomic_read(&folio->_mapcount) >= 0; + if (atomic_read(compound_mapcount_ptr(&folio->page)) >= 0) return true; - if (PageHuge(page)) + if (folio_hugetlb(folio)) return false; - for (i = 0; i < compound_nr(page); i++) { - if (atomic_read(&page[i]._mapcount) >= 0) + + nr = folio_nr_pages(folio); + for (i = 0; i < nr; i++) { + struct page *page = nth_page(&folio->page, i); + if (atomic_read(&page->_mapcount) >= 0) return true; } return false; } -EXPORT_SYMBOL(page_mapped); +EXPORT_SYMBOL(folio_mapped); struct anon_vma *page_anon_vma(struct page *page) {