[PATCH] fixup! mm/mm_init: add zone mismatch warning during page init

[Muchun Song]

Document the ordering of shared and retained struct page initialization.

Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
 mm/mm_init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 6deae33db882..4c17a892924d 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -618,6 +618,10 @@ 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
+	/*
+	 * Shared tail struct pages are initialized during vmemmap population,
+	 * before retained struct pages reach here.
+	 */
 	vmemmap_optimization_verify_zone(page);
 }
 
-- 
2.54.0