From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E0C83D75C9 for ; Sat, 10 Oct 2026 20:43:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791665001; cv=none; b=iO4AoTaBjMcp2rKcBjKWGMrmfBXYtmFjYqCltS0XjM8iqFRGrnI/UKPewB/Uwic6oSRNp8johX4KV9bndbraE9K40Sb5SN/yIGqw9yojwXwDnzINtlI75ObQ73hfTeUejKjls2ZGkPjIa/Q5UaQgcOjjmDysJiit1cRNC2fz8VI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791665001; c=relaxed/simple; bh=espWp1KJQxR7flZv5tWTufzex8BJQmqCba/KP4veMJE=; h=Date:To:From:Subject:Message-Id; b=HWPji+7u1Y32/k09uS+di5d3zMk3btjsDxGxNwzsgRAG7wyPFobPBZ1N0p0wy6HwyIoATG1G7jotooD7UTcXQGN0tBfIrgFL4bCm27x2QdKmyO295Wj+CdPWuANvuEmqndLllOgy5COvy6FPoWeT/P8wv58pQolcY7V56v3hvXY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=sSkAUMXI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="sSkAUMXI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2A811F000FF; Sat, 10 Oct 2026 20:43:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791665000; bh=mZhpS4S91DL7Rd635VaQkxt7zGLDZiKS6fIaEeS/usk=; h=Date:To:From:Subject; b=sSkAUMXIgmh8kFNbAkNhsaM8ROhBg630mhaX+CSKS/UfeCD+O0fKfFRpANUyjgxam aPgVW3aa1BSGK/nje7yf0WuriFkn/sQRQqC0X13YnbwQUvbYAbfaovV/JWstZgwJxx 4Zq30Q474nbWJQpLOrND9pQnZqu0BaoNPWozAoV8= Date: Sat, 10 Oct 2026 13:43:19 -0700 To: mm-commits@vger.kernel.org,muchun.song@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mm_init-add-zone-mismatch-warning-during-page-init.patch added to mm-unstable branch Message-Id: <20261010204319.F2A811F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/mm_init: add zone mismatch warning during page init has been added to the -mm mm-unstable branch. Its filename is mm-mm_init-add-zone-mismatch-warning-during-page-init.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mm_init-add-zone-mismatch-warning-during-page-init.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Muchun Song Subject: mm/mm_init: add zone mismatch warning during page init Date: Sat, 10 Oct 2026 15:57:55 +0800 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. Link: https://lore.kernel.org/20261010075755.83339-7-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton Reviewed-by: Lance Yang Acked-by: Qi Zheng Cc: Madhavan Srinivasan Cc: Mike Rapoport Cc: David Hildenbrand Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Ritesh Harjani (IBM) Cc: Shrikanth Hegde Cc: Lorenzo Stoakes Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Suren Baghdasaryan Cc: Michal Hocko --- mm/mm_init.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/mm/mm_init.c~mm-mm_init-add-zone-mismatch-warning-during-page-init +++ a/mm/mm_init.c @@ -593,6 +593,15 @@ out: node_states[N_MEMORY] = saved_node_state; } +static inline void vmemmap_optimization_verify_zone(struct page *page) +{ + const unsigned int order = pfn_to_section_compound_order(page_to_pfn(page)); + + VM_WARN_ON_ONCE(vmemmap_optimizable_order(order) && + page_zone_id(page + VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) != + page_zone_id(page)); +} + void __meminit __init_single_page(struct page *page, unsigned long pfn, unsigned long zone, int nid) { @@ -609,6 +618,7 @@ void __meminit __init_single_page(struct if (!is_highmem_idx(zone)) set_page_address(page, __va(pfn << PAGE_SHIFT)); #endif + vmemmap_optimization_verify_zone(page); } #ifdef CONFIG_NUMA _ Patches currently in -mm which might be from muchun.song@linux.dev are mm-sparse-vmemmap-drop-vmemmap_populate_dax.patch mm-sparse-vmemmap-support-device-dax-in-common-vmemmap-path.patch mm-sparse-vmemmap-drop-device-dax-specific-population-path.patch mm-sparse-vmemmap-remove-the-unused-ptpfn-argument.patch mm-sparse-vmemmap-open-code-vmemmap_populate_address.patch mm-mm_init-add-zone-mismatch-warning-during-page-init.patch mm-mm_init-add-zone-mismatch-warning-during-page-init-fix.patch mm-fix-missing-page-table-destructor-in-pagetable_free.patch riscv-mm-fix-hotplug-page-table-destructor-handling.patch riscv-mm-fix-missing-destructor-for-hotplug-pud-tables.patch arm64-mm-fix-destructor-for-unconstructed-hotplug-page-tables.patch