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 C378EC9832F for ; Mon, 28 Sep 2026 02:00:09 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4htPdh1rBDz2yFC; Mon, 28 Sep 2026 12:00:08 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip="2001:41d0:203:375::de" ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790560808; cv=none; b=CAQYcKep+gTvnO9enCLhX+NAFIpwLLoL+Io3ydf0T31BUvsFomJB8abndS410qYzIDXXjZ0QgZNLdan4Zs6St+sjNgpfSe0ZatMt5DNfwgcWC4+qaZ8ow/LnTNGOxIzM9JBaMYnORqY7Rzrkhj10OjazWVhVchKbEZVh2nw2rIZ18cuRH0FJysi24f29ZdoYGRnGE8zXLMxCxQNFxdKnY+iLViqROBUbLxUBoDJWC1LUTuxphpGCqBPrkFX/VP+iFvtVjiJ2z+n5tIEkWaFmSvPdRd8n+8Q3f2X9eVCY7pUQzpveqUh6YdCB3fYLaN52xbj18sBHCAtgRv8oTRsoVw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1790560808; c=relaxed/relaxed; bh=wif+2OotdgNoSE2PDumw0Ytb2mptobrggVKd9yP4JUs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Ggf+qXE+aENAny1JrwwsNUXytB6DmGdq59HPzvGjp/1JynKWi3hh18WKFlWfVqo18vhjTaEk2O/Zt5uHdT1i7VlUeFps3ajHTWK7gLtyBxdktnWFLcFJjNQru5NSULceOfKKL1agDpsqjFnVGIkHI2gfOGFk0597bioCEvYNjgmUwieYSdyGlMD7is8gvYv8oWboqQitDSJUVJbkI9Xtwq3bkp5vQpvjjmslDH9jjavQpxxcPkM7wDk8vTPvNDAm7+LBKfrJN8qqHfSYJRv/KXOgGOyC2EjMT2vZ5fAcozRPT2vrTrqG9BzTzQvk+Ge7leV75rvuEi40pNNspwXodA== 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=uElmx2Qu; dkim-atps=neutral; spf=pass (client-ip=2001:41d0:203:375::de; helo=mta1.migadu.com; envelope-from=qi.zheng@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=uElmx2Qu; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.dev (client-ip=2001:41d0:203:375::de; helo=mta1.migadu.com; envelope-from=qi.zheng@linux.dev; receiver=lists.ozlabs.org) Received: from mta1.migadu.com (out-222.mta1.migadu.com [IPv6:2001:41d0:203:375::de]) (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 4htPdd5FRwz2yr0 for ; Mon, 28 Sep 2026 12:00:05 +1000 (AEST) X-Envelope-To: linuxppc-dev@lists.ozlabs.org DKIM-Signature: a=rsa-sha256; bh=BcqFNljILjUCpRPkdS11OgSUczWkfuZ6jLqgRCapH/U=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1790560786; v=1; x=1791165586; b=uElmx2QurfqyOBKvVv01kL0GN9zGPkXnf6SJYkbAl1EmIrE5DScIEK6w8GFWLZB8CFXbXkrY sDWlS6JocYM9T976nT3Mc9pvDCu7aM+4NgwIvB+nTy0ugAiogEk96kDKqow7fM6hNj++5I0W2HV LqoTNJX7I/WGo9C6SQ93x8aw= X-Envelope-To: linuxppc-dev@lists.ozlabs.org Received: by smtp.migadu.com with ESMTPS id 8140d4f261078bf9; Mon, 28 Sep 2026 01:59:46 +0000 X-Mizu-Trace-ID: 8140d4f261078bf9 X-Migadu-Flow: FLOW_OUT Message-ID: <5b775a0f-322c-45f2-939c-ad508490b4ff@linux.dev> Date: Mon, 28 Sep 2026 09:59:39 +0800 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 6/6] mm/mm_init: add zone mismatch warning during page init To: Muchun Song , Madhavan Srinivasan , Mike Rapoport , Andrew Morton , David Hildenbrand Cc: Michael Ellerman , Nicholas Piggin , Christophe Leroy , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev References: <20260924075259.2013039-1-songmuchun@bytedance.com> <20260924075259.2013039-7-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20260924075259.2013039-7-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/24/26 3:52 PM, Muchun Song wrote: > 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. > > Warn in __init_single_page() if the shared tail page has a different > page_zone_id(), which would indicate inconsistent initialization. > > Signed-off-by: Muchun Song > --- > v2: > - New patch. > --- > mm/mm_init.c | 3 +++ > 1 file changed, 3 insertions(+) Acked-by: Qi Zheng Thanks, Qi > > diff --git a/mm/mm_init.c b/mm/mm_init.c > index 1650d6bc1211..bd02e8d06965 100644 > --- a/mm/mm_init.c > +++ b/mm/mm_init.c > @@ -609,6 +609,9 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn, > if (!is_highmem_idx(zone)) > set_page_address(page, __va(pfn << PAGE_SHIFT)); > #endif > + VM_WARN_ON_ONCE(vmemmap_optimizable_order(pfn_to_section_compound_order(pfn)) && > + page_zone_id(page + VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) != > + page_zone_id(page)); > } > > #ifdef CONFIG_NUMA