tree daa3e8aa0b4d4c66fc0743d97dde9cdb9a2da71b
parent 65dfe3c3bc411caa04c4f6c7d81418b90d6a2ce8
author Matthew Wilcox (Oracle) <willy@infradead.org> 1602817543 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1602871875 -0700

mm/huge_memory: fix can_split_huge_page assumption of THP size

Ask the page how many subpages it has instead of assuming it's PMD size.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: "Huang, Ying" <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-8-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>