mm/debug_vm_pgtable: test pmd_leaf() behavior with pmd_mkinvalid()

An invalidated pmd should still cause pmd_leaf() to return true.  Let's
test for that to ensure all arches remain consistent.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryan Roberts <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: Catalin Marinas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ryanhrob

mm/debug_vm_pgtable.c

@@ -982,6 +982,7 @@ static void __init pmd_thp_tests(struct pgtable_debug_args *args)
 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
 	WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd))));
 	WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))));
+	WARN_ON(!pmd_leaf(pmd_mkinvalid(pmd_mkhuge(pmd))));
 #endif /* __HAVE_ARCH_PMDP_INVALIDATE */
 }