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 E7E174E4C5E for ; Tue, 29 Sep 2026 21:32:47 +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=1790717571; cv=none; b=YEZmUXLJ96NQ5I+lUznKO4srjRXcM9fcnGl108fCfKWnPS5rD+D4o3pNQh2DXZdBIJXAtZzCnV7MmiTmN4XFmcsSCTFkwzuMHQixCs7VygheLPgvtEo5lunPM+cCPqo3njcE03Q/5snSRAYEIFyBAr0WXNV5JVnCrYmB5jxnM9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790717571; c=relaxed/simple; bh=asAcDdQf2hdqjRoVOyuuhwmOIKGH21MQtw6zdyyyZ/0=; h=Date:To:From:Subject:Message-Id; b=ZP+SwaSlDiQLRgal8TAKj9XXEEOkPdH8R/uMIWSjmXRGDP4CPe8rThSzeZ+OX0uJGgBAjFvxcL6J0bVI3q9YQ+3aeHjV93h4BOBW8uUQc9ma7NF4DoPHxR/aB6v/pAaEewm774KgzYhPsYjxE6CDz/H47f6wMYR3uERXgo95idc= 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=Mk7Wjmyp; 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="Mk7Wjmyp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 490AF1F00898; Tue, 29 Sep 2026 21:32:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790717566; bh=d/K9+g+sV8MsCqU+6d/j7e5ZH5VGayLx6jlt/fIdi+E=; h=Date:To:From:Subject; b=Mk7WjmypVbeqBW0UtA4Vmg5bh/UttrUY/YjvwE21HvLpuSBO/sqaf3gIAfWCQsYXW 5ZUrt8KU7C7AYWL3SikUHpw7ybQnR7kKE9cuq8c2zT4QxiFdDwyI0SRuzckGxQoq+9 33w43jCqiGCeacOjxNlmYHAiRdILvB6M/28+X1aY= Date: Tue, 29 Sep 2026 14:32:45 -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-new branch Message-Id: <20260929213246.490AF1F00898@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-new 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-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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: Tue, 29 Sep 2026 13:32:31 +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/20260929053231.66085-7-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton 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 | 3 +++ 1 file changed, 3 insertions(+) --- a/mm/mm_init.c~mm-mm_init-add-zone-mismatch-warning-during-page-init +++ a/mm/mm_init.c @@ -609,6 +609,9 @@ void __meminit __init_single_page(struct 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 _ Patches currently in -mm which might be from muchun.song@linux.dev are mm-sparse-vmemmap-factor-out-shared-vmemmap-tail-page-allocation.patch mm-sparse-vmemmap-allocate-shared-tail-page-array-dynamically.patch mm-sparse-vmemmap-introduce-config_vmemmap_optimization.patch mm-sparse-vmemmap-open-code-init_compound_tail.patch mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch mm-sparse-vmemmap-set-compound-page-order-for-device-dax.patch mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages-fix.patch mm-sparse-vmemmap-move-vmemmap-optimization-helpers-to-a-public-header.patch powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch documentation-mm-update-dax-vmemmap-deduplication-docs.patch 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