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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E05A3CA6004 for ; Sat, 10 Oct 2026 10:34:45 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4j20Tw1sDXz2y1W; Sat, 10 Oct 2026 21:34:44 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2001:41d0:203:375::a6" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1791628484; cv=none; b=GRCO/8SJsoSrAxPsErCA2VMMh56t2UjjNGRMsQWLn4aJF1B3RKsV4SY/AHpZNMBG7NHq6PN3/kGloWqOIvDH4Au2tutWeSOaAPOqwf3Phl+9mNtd5Mgq5qoIhajOxPLSqBzzPBJx7Zm37Jwfm/YVeOZueptwEAyasYrHRaJ3r/yJFaHHq9iWwjQDYRuhQecQYH3CpvBZb4f7ykoMZVodvn3ZBRAS9UgawaSBT1BLw1OsmymoJ8QkkBeVt+gp2O+AjMYgu0kewBS5LvqaVC2UsLYPNP7AKhin4x7Vusf3H0Lb8JtKxk9pO34ICXmoIdYsUkxe44WBFecalLlUhmvH0Q== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1791628484; c=relaxed/relaxed; bh=g2VyDxK77mq7FOSsOuc0VjLLB5/X+CTe8SCo2xbPUpo=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc: Message-Id:References:To; b=eea7rvkynKEwOqP1MTaw06rn3c5RIF8cizc9193EmsR14skfNm/EkYeoTbHyNWf6z0mzZsJfAVAeDlZecwF2vHYTPu41WCxjAPNeXc+Yqrsh3p9pq3DsNwi9IJ2KGOtdltvD5crDnRU0dHvZ5KRQUOvNL68zYcnOu66vQzQ1YFUswAVe57jSCCZCVNjqdTqcnS8DmUS3hGbUu4jxzNvnSg5qfWZyTA+l1n7A86AwuTWWz07yRGLHGM9cXoAUtAsXae8pgQRDJOKbmurQlLBqeBvabWEG/UEOF0Btzif319pPFXzSKXPA2pwg2iSfe47ywHpTj0XM09puRdrPfLvqbw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.dev; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=o7v6ZlxE; dkim-atps=neutral; spf=pass (client-ip=2001:41d0:203:375::a6; helo=mta1.migadu.com; envelope-from=muchun.song@linux.dev; receiver=lists.ozlabs.org) smtp.mailfrom=linux.dev Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=o7v6ZlxE; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.dev (client-ip=2001:41d0:203:375::a6; helo=mta1.migadu.com; envelope-from=muchun.song@linux.dev; receiver=lists.ozlabs.org) Received: from mta1.migadu.com (out-166.mta1.migadu.com [IPv6:2001:41d0:203:375::a6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4j20Tq68X5z2xwZ for ; Sat, 10 Oct 2026 21:34:37 +1100 (AEDT) X-Envelope-To: linuxppc-dev@lists.ozlabs.org DKIM-Signature: a=rsa-sha256; bh=g2VyDxK77mq7FOSsOuc0VjLLB5/X+CTe8SCo2xbPUpo=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1791628454; v=1; x=1792233254; b=o7v6ZlxEAY/w3T0uAInbokQuLcImEW3tq4ieDxhluOmHWMHdYELr/fwxx8FY6ovKgcaAPvIR sgstR7BOlg1LcwRisOLKHZ3kZtaNkiKDvz/NSS6mpN/mOefcvCMaQLWpESuYIHQvXXBpHV2t1qN q8IXJ7HYo6HeXnL1zi+H6nSU= X-Envelope-To: linuxppc-dev@lists.ozlabs.org Received: by smtp.migadu.com with ESMTPS id 44cd96bd31e91f15; Sat, 10 Oct 2026 10:34:14 +0000 X-Mizu-Trace-ID: 44cd96bd31e91f15 X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset=us-ascii X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3901.100.1.1.12\)) Subject: Re: [PATCH v4 6/6] mm/mm_init: add zone mismatch warning during page init From: Muchun Song In-Reply-To: Date: Sat, 10 Oct 2026 18:33:59 +0800 Cc: Muchun Song , Madhavan Srinivasan , Andrew Morton , David Hildenbrand , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Ritesh Harjani , Shrikanth Hegde , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Qi Zheng , Lance Yang , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Content-Transfer-Encoding: quoted-printable Message-Id: <7E20DFEA-72C0-4417-92E3-66A077904AE5@linux.dev> References: <20261010075755.83339-1-songmuchun@bytedance.com> <20261010075755.83339-7-songmuchun@bytedance.com> <434B0573-BF18-4413-9BDF-C5873CC13206@linux.dev> To: Mike Rapoport X-Mailer: Apple Mail (2.3901.100.1.1.12) > On Oct 10, 2026, at 17:58, Mike Rapoport wrote: >=20 > On Sat, Oct 10, 2026 at 05:32:59PM +0800, Muchun Song wrote: >>=20 >>=20 >>> On Oct 10, 2026, at 15:57, Muchun Song = wrote: >>>=20 >>> For vmemmap-optimized sections, tail struct pages may be backed by >>> shared vmemmap pages. Those shared pages must carry the same page = zone >>> ID as the struct pages initialized for the section. >>>=20 >>> Warn in __init_single_page() if the shared tail page has a different >>> page_zone_id(), which would indicate inconsistent initialization. >>=20 >> Please ignore Sashiko's report [1], both are false positive. It = didn't >> realize that shared vmemmap pages are initialized early before = __init_single_page(). >=20 > I didn't realize it too when I read this first :) >=20 > How about a short comment above vmemmap_optimization_verify_zone()? Good point. A short comment there would be helpful. Thanks, Muchun >=20 >> [1] = https://sashiko.dev/#/patchset/20261010075755.83339-1-songmuchun%40bytedan= ce.com?part=3D6 >>=20 >> Thanks. >=20 > --=20 > Sincerely yours, > Mike.