[PATCH v3 18/34] s390: mm: Add p?d_large() definitions

[Steven Price <steven.price@arm.com>]

walk_page_range() is going to be allowed to walk page tables other than
those of user space. For this it needs to know when it has reached a
'leaf' entry in the page tables. This information is provided by the
p?d_large() functions/macros.

For s390, we don't support large pages, so add a stub returning 0.

CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
CC: Heiko Carstens <heiko.carstens@de.ibm.com>
CC: linux-s390@vger.kernel.org
Signed-off-by: Steven Price <steven.price@arm.com>
---
 arch/s390/include/asm/pgtable.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 063732414dfb..9617f1fb69b4 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -605,6 +605,11 @@ static inline int pgd_present(pgd_t pgd)
 	return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
 }
 
+static inline int pgd_large(pgd_t pgd)
+{
+	return 0;
+}
+
 static inline int pgd_none(pgd_t pgd)
 {
 	if (pgd_folded(pgd))
@@ -645,6 +650,11 @@ static inline int p4d_present(p4d_t p4d)
 	return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL;
 }
 
+static inline int p4d_large(p4d_t p4d)
+{
+	return 0;
+}
+
 static inline int p4d_none(p4d_t p4d)
 {
 	if (p4d_folded(p4d))
-- 
2.20.1