[PATCH 4.9 48/88] mm/huge_memory.c: use head to check huge zero page

From: Greg Kroah-Hartman
Date: Tue Mar 10 2020 - 08:45:53 EST


From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>

commit cb829624867b5ab10bc6a7036d183b1b82bfe9f8 upstream.

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>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2095,7 +2095,7 @@ 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(!PageSwapBacked(page), page);
VM_BUG_ON_PAGE(!PageCompound(page), page);