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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 3D1F3C433B4 for ; Fri, 9 Apr 2021 19:04:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DF60D6115C for ; Fri, 9 Apr 2021 19:04:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF60D6115C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5B8726B006C; Fri, 9 Apr 2021 15:04:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 58ECE6B006E; Fri, 9 Apr 2021 15:04:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 47DA76B0070; Fri, 9 Apr 2021 15:04:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0144.hostedemail.com [216.40.44.144]) by kanga.kvack.org (Postfix) with ESMTP id 2B8FA6B006C for ; Fri, 9 Apr 2021 15:04:04 -0400 (EDT) Received: from smtpin39.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id DEC6618057FE4 for ; Fri, 9 Apr 2021 19:04:03 +0000 (UTC) X-FDA: 78013753566.39.2654EC9 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf02.hostedemail.com (Postfix) with ESMTP id B8D7340002C6 for ; Fri, 9 Apr 2021 19:03:52 +0000 (UTC) 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 X-Stat-Signature: kpb1suyf4xrpk3bg6m6htjkuwox5o4si X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B8D7340002C6 Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf02; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617995032-84368 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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; } =20 +/** + * 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); --=20 2.30.2