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=-11.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,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 46DEBC43460 for ; Tue, 13 Apr 2021 20:06:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C2004613CC for ; Tue, 13 Apr 2021 20:06:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C2004613CC 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 2E22B6B0036; Tue, 13 Apr 2021 16:06:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2917F6B006E; Tue, 13 Apr 2021 16:06:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1598A6B0070; Tue, 13 Apr 2021 16:06:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0050.hostedemail.com [216.40.44.50]) by kanga.kvack.org (Postfix) with ESMTP id ECAF36B0036 for ; Tue, 13 Apr 2021 16:06:43 -0400 (EDT) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id AB0DE180F68A3 for ; Tue, 13 Apr 2021 20:06:43 +0000 (UTC) X-FDA: 78028426686.16.B0D75A0 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id 7292240002C4 for ; Tue, 13 Apr 2021 20:06:40 +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: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:In-Reply-To:References; bh=q2Zf2fG+XVeDPByq7KpLW3zGnS7HFRyPVkPOIeTOl6g=; b=LyRRClHZQtibqJnHBLvQj7Ua4z ZhNmxJ2bk7q/E00Wp7b6IL6ig0t0YdnV4AjrBVn6hdmu8ULHk4D1Lih1StP7pxnxoqjcVPJAtKa4S NI+T6LcaiuW0ocOiWcli157Pgs8Rr08eC43v8Z59ZtA8/kb3ZEy9aReqyGgk1/w6SbYNOjw4Mb3Jb SCq/IRxaNcP0769Uxs2cFhHfSvJIPTdnH9/rsgfTFWmVGsX02t0YfqS5UQ7TyiJDdv7dt0mAYjTId z74joU9bB9JRhLoQpVXffC+/3Pk000KEGfKa4568GgeOtvghHluaBIbxgC6wdV2pWPYcPiNnVzU1s TE8ctK0g==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lWPIm-006CI6-G5; Tue, 13 Apr 2021 20:06:29 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton Subject: [PATCH 0/6] Constify struct page arguments Date: Tue, 13 Apr 2021 21:06:16 +0100 Message-Id: <20210413200622.1477171-1-willy@infradead.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7292240002C4 X-Stat-Signature: bjhrt8ckzw8htf8hfkj64m4wa8r5xqqi Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618344400-425143 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: While working on various solutions to the 32-bit struct page size regression, one of the problems I found was the networking stack expects to be able to pass const struct page pointers around, and the mm doesn't provide a lot of const-friendly functions to call. The root tangle of problems is that a lot of functions call VM_BUG_ON_PAGE(), which calls dump_page(), which calls a lot of functions which don't take a const struct page (but could be const). I have other things I need to work on, but I offer these patches as a few steps towards being able to make dump_page() take a const page pointer. Matthew Wilcox (Oracle) (6): mm: Make __dump_page static mm/debug: Factor PagePoisoned out of __dump_page mm/page_owner: Constify dump_page_owner mm: Make compound_head const-preserving mm: Constify get_pfnblock_flags_mask and get_pfnblock_migratetype mm: Constify page_count and page_ref_count include/linux/mmdebug.h | 3 +-- include/linux/page-flags.h | 10 +++++----- include/linux/page_owner.h | 6 +++--- include/linux/page_ref.h | 4 ++-- include/linux/pageblock-flags.h | 2 +- mm/debug.c | 25 +++++++------------------ mm/page_alloc.c | 16 ++++++++-------- mm/page_owner.c | 2 +- 8 files changed, 28 insertions(+), 40 deletions(-) --=20 2.30.2