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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 07F4CD1D486 for ; Thu, 8 Jan 2026 19:19:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 511C86B0089; Thu, 8 Jan 2026 14:19:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4BE276B0093; Thu, 8 Jan 2026 14:19:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3C08F6B0095; Thu, 8 Jan 2026 14:19:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 2703B6B0089 for ; Thu, 8 Jan 2026 14:19:25 -0500 (EST) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id CE714B7915 for ; Thu, 8 Jan 2026 19:19:24 +0000 (UTC) X-FDA: 84309760248.10.A596A01 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf07.hostedemail.com (Postfix) with ESMTP id 06B7F40009 for ; Thu, 8 Jan 2026 19:19:22 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=CVumgl5u; dmarc=none; spf=pass (imf07.hostedemail.com: domain of akpm@linux-foundation.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1767899963; a=rsa-sha256; cv=none; b=oadLvJFRv+00zUAxHNIq1/M0rChUkrLmOQxAfMs/7Wph73afrwL+VqwQDn07tjbbCDRq1u 4uWXyNsNSjT81hKUpKkE8ebfrE4zwS4T41t3fphetN4DpbD4IQ9rvBQr9NlrO44ZGDX4jg di7Ya2+M+fk7DbuTaqESU5A+R3/aTRk= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=CVumgl5u; dmarc=none; spf=pass (imf07.hostedemail.com: domain of akpm@linux-foundation.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1767899963; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Tzrq+4BiaeS9zeQ5BXLg5bAaN9WKhQUuxGsqtXMKVv4=; b=Oy8Ela1YcsVs+7ILbf+XpOqtaHr4zNVNtdvSE7Tj08VPHzAMv1hnwxoABDtXLOge3XiaJA NVN4SywO+0M8vm+TPSODGd1CNd6m/t6VOv5LHX8ZyPRLjjPGY//E5wWrlef3cNKwHOhZJ1 3TOYQx5ISg5Sdfc5GWQvwZKf09mKaac= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id DD4D240732; Thu, 8 Jan 2026 19:19:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CEE9CC116C6; Thu, 8 Jan 2026 19:19:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767899961; bh=fSg1rFUc7Lj8obCBDIiOBzwmsy2PDWnpS6aiVKuno6E=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=CVumgl5uYfQfaLqYgweLov8FT7OgO1ch7qHlwuZbONKicqb+bmGFoLIsYAxoWfRsr 6BxVTZH+QFJx2xSpWVk0NUrA2Ddxjwu2/Wcc1JG/gPIWft2fVjXp2CIt9nEHIpeVml fnOoO4sO6q/7KPmJQudmyHeHcLC9E7nvlzSuO+ys= Date: Thu, 8 Jan 2026 11:19:19 -0800 From: Andrew Morton To: Mike Rapoport Cc: Klara Modin , Alex Shi , Alexander Gordeev , Andreas Larsson , Borislav Petkov , Brian Cain , "Christophe Leroy (CS GROUP)" , Catalin Marinas , "David S. Miller" , Dave Hansen , David Hildenbrand , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Heiko Carstens , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Jonathan Corbet , "Liam R. Howlett" , Lorenzo Stoakes , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Muchun Song , Oscar Salvador , Palmer Dabbelt , Pratyush Yadav , Richard Weinberger , Russell King , Stafford Horne , Suren Baghdasaryan , Thomas Bogendoerfer , Thomas Gleixner , Vasily Gorbik , Vineet Gupta , Vlastimil Babka , Will Deacon , x86@kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-cxl@vger.kernel.org, linux-doc@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org Subject: Re: [PATCH 3.5] arm: make initialization of zero page independent of the memory map (was Re: [PATCH v2 22/28] arch, mm: consolidate initialization of nodes, zones and memory map) Message-Id: <20260108111919.ac5f811132672e760f47fbab@linux-foundation.org> In-Reply-To: References: <20260102070005.65328-1-rppt@kernel.org> <20260102070005.65328-23-rppt@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: r8qqrjrkkytowbm1kntsw5i7zb35yph4 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 06B7F40009 X-HE-Tag: 1767899962-570093 X-HE-Meta: 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 oekKVi/f jqsYCFBB3+MRdCXUg5t2cZc4LTZLVLWX4W8SLeos/I2o0Hr/e/ulXDtOrlc3lAD1irFmxzAmOmPo+RdiPZuPEmOa/Rf3ICM8kGhUGBPFOoCmSI/bblge605J8/AlqARHPA8ERSlskJm0GBZBWkJeYLxje8mPABmy1JUSlgivWyqH6PaT5KV5vKb6em+deufJisO8k7G+jScuGU21pnSf8WL4NdDgD/ck5mO8tlnYYIfX36Djij0gKd2yY1tgHMaWQjl2c8XhlXMK+O9ldLxtHlQ9zu+EKQ5ODKmDodfHbirKWllKSuoRGjRevOjY/3Zx9mioGBRlkMKooK6k= 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: List-Subscribe: List-Unsubscribe: On Sun, 4 Jan 2026 14:01:40 +0200 Mike Rapoport wrote: > Can you please stick this between patch 3 (arm: introduce > arch_zone_limits_init()) and patch 4 (arm64: introduce > arch_zone_limits_init())? Did, thanks. I made this a standalone patch rather than a squashable -fix. > >From 35d016bbf5da7c08cc5c5547c85558fc50cb63aa Mon Sep 17 00:00:00 2001 > From: Klara Modin > Date: Sat, 3 Jan 2026 20:40:09 +0200 > Subject: [PATCH] arm: make initialization of zero page independent of the > memory map > > Unlike most architectures, arm keeps a struct page pointer to the > empty_zero_page and to initialize it requires conversion of a virtual > address to page which makes it necessary to have memory map initialized > before creating the empty_zero_page. > > Make empty_zero_page a stataic array in BSS to decouple it's > initialization from the initialization of the memory map. > > This also aligns arm with vast majorty of architectures. Russell, can you please update us on your concerns with this change?