For vmemmap-optimized sections, the shared tail struct pages are reused across compound pages and should already carry the expected zone and node.
Warn in __init_single_page() if such a shared tail page is seen with a different zone or node, which would indicate inconsistent initialization. Signed-off-by: Muchun Song <[email protected]> --- mm/mm_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/mm_init.c b/mm/mm_init.c index 4ea39392993b..95422e92ede8 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -605,6 +605,9 @@ 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(order_vmemmap_optimizable(pfn_to_section_order(pfn)) && + page_zone_id(page + OPTIMIZED_FOLIO_VMEMMAP_NR_STRUCT_PAGES) != + page_zone_id(page)); } #ifdef CONFIG_NUMA -- 2.54.0
