From patchwork Fri Apr 16 23:15:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12209295 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,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 AC802C433B4 for ; Fri, 16 Apr 2021 23:18:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 52F4C6109F for ; Fri, 16 Apr 2021 23:18:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 52F4C6109F 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 E309B6B006C; Fri, 16 Apr 2021 19:18:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E06556B0070; Fri, 16 Apr 2021 19:18:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF5C86B0071; Fri, 16 Apr 2021 19:18:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id B6DDD6B006C for ; Fri, 16 Apr 2021 19:18:15 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 8641A180ACF7F for ; Fri, 16 Apr 2021 23:18:15 +0000 (UTC) X-FDA: 78039795750.23.DBC3E49 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf03.hostedemail.com (Postfix) with ESMTP id 68F09C0007D9 for ; Fri, 16 Apr 2021 23:18:11 +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=RXY5FTJ1nqvThpmAhIHHuvbXbki8r7wSKFoq944vSMQ=; b=Fupb4VUCIKlRD7f3HV4DpEpbaU JRDXCJkbxCbA9h7Vff8Wso3lFbjWxbjBq9PnaS0dLT7UNJ5Y6meOyzKl5QLSM0L0HWVPGJP3/p6Lz k6aR2EY1iPKYcrhjaequcIJxeQu+WXOzh9aqfg9/DCA+j2KEKLHiH4hP1SUfPBtDy1LNh35LyV3A8 Y1kzXoZCm0XSb9lVHpJETqDKwfKP0pGzlcyh83qOX5Mq0UWH6ZlHOzkrt77mqEjyznINhU++SN6hZ In9fxqu5qoBVDZz5rVH/D3LJnw4KjEeIZPAQzFKBjkzn5vj4wQav+J5qUwgdQj2mSw9wXM/qZ9tqp UjCwhO/g==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lXXi7-00Aa34-SO; Fri, 16 Apr 2021 23:17:23 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton , linux-kernel@vger.kernel.org Subject: [PATCH 6/6] mm: Constify page_count and page_ref_count Date: Sat, 17 Apr 2021 00:15:31 +0100 Message-Id: <20210416231531.2521383-7-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210416231531.2521383-1-willy@infradead.org> References: <20210416231531.2521383-1-willy@infradead.org> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 68F09C0007D9 X-Stat-Signature: kwir5xf1xbn8jw3mwroxw6xonkqjfpwt Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618615091-304589 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: Now that compound_head() accepts a const struct page pointer, these two functions can be marked as not modifying the page pointer they are passed. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Vlastimil Babka Reviewed-by: Anshuman Khandual --- include/linux/page_ref.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h index f3318f34fc54..7ad46f45df39 100644 --- a/include/linux/page_ref.h +++ b/include/linux/page_ref.h @@ -62,12 +62,12 @@ static inline void __page_ref_unfreeze(struct page *page, int v) #endif -static inline int page_ref_count(struct page *page) +static inline int page_ref_count(const struct page *page) { return atomic_read(&page->_refcount); } -static inline int page_count(struct page *page) +static inline int page_count(const struct page *page) { return atomic_read(&compound_head(page)->_refcount); }