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mm/huge_memory.c: use head to check huge zero page
author
Wei Yang
<richardw.yang@linux.intel.com>
Fri, 31 Jan 2020 06:14:29 +0000
(22:14 -0800)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Thu, 5 Mar 2020 15:42:23 +0000
(16:42 +0100)
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@linux.intel.com
Fixes:
e9b61f19858a
("thp: reintroduce split_huge_page()")
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mm/huge_memory.c
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diff --git
a/mm/huge_memory.c
b/mm/huge_memory.c
index
5bb93cf
..
fba935c
100644
(file)
--- a/
mm/huge_memory.c
+++ b/
mm/huge_memory.c
@@
-2661,7
+2661,7
@@
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);