Commit b259672e authored Jan 30, 2020 by Wei Yang Committed by Greg Kroah-Hartman Mar 11, 2020

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.

Link: http://lkml.kernel.org/r/20200110032610.26499-1-richardw.yang@linux.intel.com


Fixes: e9b61f19 ("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>

parent c628c467

mm/huge_memory.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2095,7 +2095,7 @@ 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(!PageSwapBacked(page), page);
		VM_BUG_ON_PAGE(!PageCompound(page), page);