mips: add support for folded p4d page tables

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate, replace 5leve-fixup.h with pgtable-nop4d.h and
drop usage of __ARCH_USE_5LEVEL_HACK.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: Mike Rapoport <rppt@kernel.org>

1 files changed, 19 insertions, 18 deletions

diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 62a9e2c31312..f92716cfa4f4 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -17,13 +17,12 @@
 #include <asm/cachectl.h>
 #include <asm/fixmap.h>
 
-#define __ARCH_USE_5LEVEL_HACK
 #if CONFIG_PGTABLE_LEVELS == 2
 #include <asm-generic/pgtable-nopmd.h>
 #elif CONFIG_PGTABLE_LEVELS == 3
 #include <asm-generic/pgtable-nopud.h>
 #else
-#include <asm-generic/5level-fixup.h>
+#include <asm-generic/pgtable-nop4d.h>
 #endif
 
 /*
@@ -188,47 +187,49 @@ extern pud_t invalid_pud_table[PTRS_PER_PUD];
 /*
  * Empty pgd entries point to the invalid_pud_table.
  */
-static inline int pgd_none(pgd_t pgd)
+static inline int p4d_none(p4d_t p4d)
 {
-	return pgd_val(pgd) == (unsigned long)invalid_pud_table;
+	return p4d_val(p4d) == (unsigned long)invalid_pud_table;
 }
 
-static inline int pgd_bad(pgd_t pgd)
+static inline int p4d_bad(p4d_t p4d)
 {
-	if (unlikely(pgd_val(pgd) & ~PAGE_MASK))
+	if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
 		return 1;
 
 	return 0;
 }
 
-static inline int pgd_present(pgd_t pgd)
+static inline int p4d_present(p4d_t p4d)
 {
-	return pgd_val(pgd) != (unsigned long)invalid_pud_table;
+	return p4d_val(p4d) != (unsigned long)invalid_pud_table;
 }
 
-static inline void pgd_clear(pgd_t *pgdp)
+static inline void p4d_clear(p4d_t *p4dp)
 {
-	pgd_val(*pgdp) = (unsigned long)invalid_pud_table;
+	p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
 }
 
 #define pud_index(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
 
-static inline unsigned long pgd_page_vaddr(pgd_t pgd)
+static inline unsigned long p4d_page_vaddr(p4d_t p4d)
 {
-	return pgd_val(pgd);
+	return p4d_val(p4d);
 }
 
-#define pgd_phys(pgd)		virt_to_phys((void *)pgd_val(pgd))
-#define pgd_page(pgd)		(pfn_to_page(pgd_phys(pgd) >> PAGE_SHIFT))
+#define p4d_phys(p4d)		virt_to_phys((void *)p4d_val(p4d))
+#define p4d_page(p4d)		(pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
 
-static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
+#define p4d_index(address)	(((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
+
+static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 {
-	return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
+	return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
 }
 
-static inline void set_pgd(pgd_t *pgd, pgd_t pgdval)
+static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
 {
-	*pgd = pgdval;
+	*p4d = p4dval;
 }
 
 #endif