blob: 74d02c39eee980823241cd4115559d32a5f9cf2d [file] [log] [blame]
From c525e55bd26fb4239466f64e9f43f73a1c77e4b0 Mon Sep 17 00:00:00 2001
From: Wei Yang <>
Date: Thu, 30 Jan 2020 22:14:29 -0800
Subject: [PATCH] mm/huge_memory.c: use head to check huge zero page
commit cb829624867b5ab10bc6a7036d183b1b82bfe9f8 upstream.
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 <>
Acked-by: Kirill A. Shutemov <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Paul Gortmaker <>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2b90d4f85df5..aae6027dc82d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2674,7 +2674,7 @@ 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);