[PATCH v4 07/14] openrisc: add support for folded p4d page tables

[Mike Rapoport <rppt@kernel.org>]

From: Mike Rapoport <rppt@linux.ibm.com>

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and remove usage of __ARCH_USE_5LEVEL_HACK.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
 arch/openrisc/include/asm/pgtable.h |  1 -
 arch/openrisc/mm/fault.c            | 10 ++++++++--
 arch/openrisc/mm/init.c             |  4 +++-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
index 7f3fb9ceb083..219979e57790 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -21,7 +21,6 @@
 #ifndef __ASM_OPENRISC_PGTABLE_H
 #define __ASM_OPENRISC_PGTABLE_H
 
-#define __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nopmd.h>
 
 #ifndef __ASSEMBLY__
diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
index 8af1cc78c4fb..6e0a11ac4c00 100644
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -295,6 +295,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 
 		int offset = pgd_index(address);
 		pgd_t *pgd, *pgd_k;
+		p4d_t *p4d, *p4d_k;
 		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
@@ -321,8 +322,13 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
 		 * it exists.
 		 */
 
-		pud = pud_offset(pgd, address);
-		pud_k = pud_offset(pgd_k, address);
+		p4d = p4d_offset(pgd, address);
+		p4d_k = p4d_offset(pgd_k, address);
+		if (!p4d_present(*p4d_k))
+			goto no_context;
+
+		pud = pud_offset(p4d, address);
+		pud_k = pud_offset(p4d_k, address);
 		if (!pud_present(*pud_k))
 			goto no_context;
 
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index 1f87b524db78..2536aeae0975 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -71,6 +71,7 @@ static void __init map_ram(void)
 	unsigned long v, p, e;
 	pgprot_t prot;
 	pgd_t *pge;
+	p4d_t *p4e;
 	pud_t *pue;
 	pmd_t *pme;
 	pte_t *pte;
@@ -90,7 +91,8 @@ static void __init map_ram(void)
 
 		while (p < e) {
 			int j;
-			pue = pud_offset(pge, v);
+			p4e = p4d_offset(pge, v);
+			pue = pud_offset(p4e, v);
 			pme = pmd_offset(pue, v);
 
 			if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
-- 
2.25.1