[patch 062/118] mm/huge_memory.c: use head to check huge zero page

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From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Subject: mm/huge_memory.c: use head to check huge zero page

The page could be a tail page, if this is the case, this BUG_ON will never
be triggered.

Link: http://lkml.kernel.org/r/20200110032610.26499-1-richardw.yang@xxxxxxxxxxxxxxx
Fixes: e9b61f19858a ("thp: reintroduce split_huge_page()")

Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/huge_memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/huge_memory.c~mm-huge_memoryc-use-head-to-check-huge-zero-page
+++ a/mm/huge_memory.c
@@ -2712,7 +2712,7 @@ int split_huge_page_to_list(struct page
 	unsigned long flags;
 	pgoff_t end;
 
-	VM_BUG_ON_PAGE(is_huge_zero_page(page), page);
+	VM_BUG_ON_PAGE(is_huge_zero_page(head), head);
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	VM_BUG_ON_PAGE(!PageCompound(page), page);
 
_



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