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); _
