Ask the page how many subpages it has instead of assuming it's PMD size.
Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NSeongJae Park <sjpark@amazon.de>
Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: N"Huang, Ying" <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-8-willy@infradead.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>