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=-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=unavailable 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 696AAC433ED for ; Fri, 9 Apr 2021 19:04:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D90F6115C for ; Fri, 9 Apr 2021 19:04:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234830AbhDITEd (ORCPT ); Fri, 9 Apr 2021 15:04:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234692AbhDITEb (ORCPT ); Fri, 9 Apr 2021 15:04:31 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DAFB5C061762; Fri, 9 Apr 2021 12:04:17 -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=Mf5he/ba/r+UNHVPyU98btIvka6mXa95Hf7mjCLcMVg=; b=MkIcROPHjS314CkgaiIP1CwgF5 0HmmGbBqvwsE50d2qgjUX3MrkVflXJ19XWFcijM7SFcDtqGhyYBIK0c8B4Isau+a9cqhhfWjdhRbg 8L4ixVGGE4FU60SyPRkUHx5HpAIgad3XMG3+9ps6P9wyWpxJnkn9NmlwAn9FeTlrV7PR2d5wT94Lg 1b/D/5+nRwq3f+SKSu/eRu/PUy7mAAk9Rvpk1VORM/9KXDWSTL3OII/91qH9b2wvD1WM+x8f6888p Izb2bbn81A5bzHbxyzJCjAH52N7a0Yl0JsFeJAhz2Q8thoXIu1QyCr4/UbhW+onpHBFlLoN3Ics9Y 3KGAI4bQ==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lUwOC-000o2d-SM; Fri, 09 Apr 2021 19:02:25 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, Christoph Hellwig , Jeff Layton Subject: [PATCH v7 15/28] mm: Add folio_mapcount Date: Fri, 9 Apr 2021 19:50:52 +0100 Message-Id: <20210409185105.188284-16-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210409185105.188284-1-willy@infradead.org> References: <20210409185105.188284-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is the folio equivalent of page_mapcount(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Jeff Layton --- include/linux/mm.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 143b354c3f4a..7bd2ce197e2f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -883,6 +883,22 @@ static inline int page_mapcount(struct page *page) return atomic_read(&page->_mapcount) + 1; } +/** + * folio_mapcount - The number of mappings of this folio. + * @folio: The folio. + * + * The result includes the number of times any of the pages in the + * folio are mapped to userspace. + * + * Return: The number of page table entries which refer to this folio. + */ +static inline int folio_mapcount(struct folio *folio) +{ + if (unlikely(FolioMulti(folio))) + return __page_mapcount(&folio->page); + return atomic_read(&folio->_mapcount) + 1; +} + #ifdef CONFIG_TRANSPARENT_HUGEPAGE int total_mapcount(struct page *page); int page_trans_huge_mapcount(struct page *page, int *total_mapcount); -- 2.30.2