[PATCH 1/2] mm/huge_memory.c: use head to check huge zero page

Wei Yang
2020-01-10T03:26:25Z

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

Fixes: e9b61f19858a ("thp: reintroduce split_huge_page()")

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---
mm/huge_memory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 168d8a1a9bac..90165f68cf13 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2696,7 +2696,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
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);

--
2.17.1