From patchwork Tue Jun 29 02:41:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12349187 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=-15.8 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 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 86F58C11F65 for ; Tue, 29 Jun 2021 02:41:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3E4E2611AE for ; Tue, 29 Jun 2021 02:41:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E4E2611AE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 92EF18D0111; Mon, 28 Jun 2021 22:41:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8B7D58D00F0; Mon, 28 Jun 2021 22:41:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 731F98D0111; Mon, 28 Jun 2021 22:41:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0199.hostedemail.com [216.40.44.199]) by kanga.kvack.org (Postfix) with ESMTP id 4761A8D00F0 for ; Mon, 28 Jun 2021 22:41:27 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 40AD58249980 for ; Tue, 29 Jun 2021 02:41:27 +0000 (UTC) X-FDA: 78305210214.35.F9B85FD Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf05.hostedemail.com (Postfix) with ESMTP id EE177E00025C for ; Tue, 29 Jun 2021 02:41:26 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 0BCB261D0C; Tue, 29 Jun 2021 02:41:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1624934486; bh=z+oAVVjlGIwkhmpFvRmzGVnC4giyS+xOs219fpV1yvo=; h=Date:From:To:Subject:In-Reply-To:From; b=Eq5p78vPU9nkaorjIF0eKvRNbUmD96X0xfUVJQgx1BC2s9/+KEFfARaqIespN/R6m DhXpYHkNcdoNB74/ByEjGwHXCdPYGC5V9eq2kz0Wqe7vemSY5K9z6vR42xCUR9/mPV vhsjpuz5P4MLRTwsC6ZrsZFkegQmn98yATP7HmEA= Date: Mon, 28 Jun 2021 19:41:25 -0700 From: Andrew Morton To: akpm@linux-foundation.org, anshuman.khandual@arm.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vbabka@suse.cz, william.kucharski@oracle.com, willy@infradead.org Subject: [patch 156/192] mm: constify page_count and page_ref_count Message-ID: <20210629024125.8tPyrqCyS%akpm@linux-foundation.org> In-Reply-To: <20210628193256.008961950a714730751c1423@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=Eq5p78vP; spf=pass (imf05.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Stat-Signature: eec576ncez7aggf83okgsabh31t4tbz3 X-Rspamd-Queue-Id: EE177E00025C X-Rspamd-Server: rspam06 X-HE-Tag: 1624934486-272028 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: From: "Matthew Wilcox (Oracle)" Subject: mm: constify page_count and page_ref_count 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. Link: https://lkml.kernel.org/r/20210416231531.2521383-7-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Vlastimil Babka Reviewed-by: Anshuman Khandual Reviewed-by: William Kucharski Signed-off-by: Andrew Morton --- include/linux/page_ref.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/include/linux/page_ref.h~mm-constify-page_count-and-page_ref_count +++ a/include/linux/page_ref.h @@ -62,12 +62,12 @@ static inline void __page_ref_unfreeze(s #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); }