Re: [PATCH 05/12] m68k: mm: use pgtable-nopXd instead of 4level-fixup

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Hi Mike,

On 23/10/19 7:28 pm, Mike Rapoport wrote:
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>

m68k has two or three levels of page tables and can use appropriate
pgtable-nopXd and folding of the upper layers.

Replace usage of include/asm-generic/4level-fixup.h and explicit
definitions of __PAGETABLE_PxD_FOLDED in m68k with
include/asm-generic/pgtable-nopmd.h for two-level configurations and with
include/asm-generic/pgtable-nopmd.h for three-lelve configurations and
adjust page table manipulation macros and functions accordingly.

Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>

Tested (on real hardware) for the ColdFire MMU m68k variants and working

Acked-by: Greg Ungerer <gerg@xxxxxxxxxxxxxx>

Regards
Greg


---
  arch/m68k/include/asm/mcf_pgalloc.h      |  7 -------
  arch/m68k/include/asm/mcf_pgtable.h      | 28 +++++++++----------------
  arch/m68k/include/asm/mmu_context.h      | 12 ++++++++++-
  arch/m68k/include/asm/motorola_pgalloc.h |  4 ++--
  arch/m68k/include/asm/motorola_pgtable.h | 32 +++++++++++++++++-----------
  arch/m68k/include/asm/page.h             |  9 +++++---
  arch/m68k/include/asm/pgtable_mm.h       | 11 ++++++----
  arch/m68k/include/asm/sun3_pgalloc.h     |  5 -----
  arch/m68k/include/asm/sun3_pgtable.h     | 18 ----------------
  arch/m68k/kernel/sys_m68k.c              | 10 ++++++++-
  arch/m68k/mm/init.c                      |  6 ++++--
  arch/m68k/mm/kmap.c                      | 36 ++++++++++++++++++++++++--------
  arch/m68k/mm/mcfmmu.c                    | 16 +++++++++++++-
  arch/m68k/mm/motorola.c                  | 17 +++++++++------
  14 files changed, 122 insertions(+), 89 deletions(-)

diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
index b34d44d..82ec54c 100644
--- a/arch/m68k/include/asm/mcf_pgalloc.h
+++ b/arch/m68k/include/asm/mcf_pgalloc.h
@@ -28,9 +28,6 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
  	return (pmd_t *) pgd;
  }
-#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
-#define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
-
  #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
  	(unsigned long)(page_address(page)))
@@ -45,8 +42,6 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
  	__free_page(page);
  }
-#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
-
  static inline struct page *pte_alloc_one(struct mm_struct *mm)
  {
  	struct page *page = alloc_pages(GFP_DMA, 0);
@@ -100,6 +95,4 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  	return new_pgd;
  }
-#define pgd_populate(mm, pmd, pte) BUG()
-
  #endif /* M68K_MCF_PGALLOC_H */
diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index 5d5502c..b9f45ae 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -198,17 +198,9 @@ static inline int pmd_bad2(pmd_t *pmd) { return 0; }
  #define pmd_present(pmd) (!pmd_none2(&(pmd)))
  static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
-static inline int pgd_none(pgd_t pgd) { return 0; }
-static inline int pgd_bad(pgd_t pgd) { return 0; }
-static inline int pgd_present(pgd_t pgd) { return 1; }
-static inline void pgd_clear(pgd_t *pgdp) {}
-
  #define pte_ERROR(e) \
  	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
  	__FILE__, __LINE__, pte_val(e))
-#define pmd_ERROR(e) \
-	printk(KERN_ERR "%s:%d: bad pmd %08lx.\n",	\
-	__FILE__, __LINE__, pmd_val(e))
  #define pgd_ERROR(e) \
  	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
  	__FILE__, __LINE__, pgd_val(e))
@@ -340,14 +332,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
  #define pgd_offset_k(address)	pgd_offset(&init_mm, address)
/*
- * Find an entry in the second-level pagetable.
- */
-static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
-{
-	return (pmd_t *) pgd;
-}
-
-/*
   * Find an entry in the third-level pagetable.
   */
  #define __pte_offset(address)	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
@@ -360,12 +344,16 @@ static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
  static inline void nocache_page(void *vaddr)
  {
  	pgd_t *dir;
+	p4d_t *p4dp;
+	pud_t *pudp;
  	pmd_t *pmdp;
  	pte_t *ptep;
  	unsigned long addr = (unsigned long) vaddr;
dir = pgd_offset_k(addr);
-	pmdp = pmd_offset(dir, addr);
+	p4dp = p4d_offset(dir, addr);
+	pudp = pud_offset(p4dp, addr);
+	pmdp = pmd_offset(pudp, addr);
  	ptep = pte_offset_kernel(pmdp, addr);
  	*ptep = pte_mknocache(*ptep);
  }
@@ -376,12 +364,16 @@ static inline void nocache_page(void *vaddr)
  static inline void cache_page(void *vaddr)
  {
  	pgd_t *dir;
+	p4d_t *p4dp;
+	pud_t *pudp;
  	pmd_t *pmdp;
  	pte_t *ptep;
  	unsigned long addr = (unsigned long) vaddr;
dir = pgd_offset_k(addr);
-	pmdp = pmd_offset(dir, addr);
+	p4dp = p4d_offset(dir, addr);
+	pudp = pud_offset(p4dp, addr);
+	pmdp = pmd_offset(pudp, addr);
  	ptep = pte_offset_kernel(pmdp, addr);
  	*ptep = pte_mkcache(*ptep);
  }
diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index f5b1852..cac9f28 100644
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -100,6 +100,8 @@ static inline void load_ksp_mmu(struct task_struct *task)
  	struct mm_struct *mm;
  	int asid;
  	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
  	pmd_t *pmd;
  	pte_t *pte;
  	unsigned long mmuar;
@@ -127,7 +129,15 @@ static inline void load_ksp_mmu(struct task_struct *task)
  	if (pgd_none(*pgd))
  		goto bug;
- pmd = pmd_offset(pgd, mmuar);
+	p4d = p4d_offset(pgd, mmuar);
+	if (p4d_none(*p4d))
+		goto bug;
+
+	pud = pud_offset(p4d, mmuar);
+	if (pud_none(*pud))
+		goto bug;
+
+	pmd = pmd_offset(pud, mmuar);
  	if (pmd_none(*pmd))
  		goto bug;
diff --git a/arch/m68k/include/asm/motorola_pgalloc.h b/arch/m68k/include/asm/motorola_pgalloc.h
index acab315..ff9cc40 100644
--- a/arch/m68k/include/asm/motorola_pgalloc.h
+++ b/arch/m68k/include/asm/motorola_pgalloc.h
@@ -106,9 +106,9 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
  }
  #define pmd_pgtable(pmd) pmd_page(pmd)
-static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  {
-	pgd_set(pgd, pmd);
+	pud_set(pud, pmd);
  }
#endif /* _MOTOROLA_PGALLOC_H */
diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
index 7f66a7b..62bedc6 100644
--- a/arch/m68k/include/asm/motorola_pgtable.h
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -117,14 +117,14 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
  	}
  }
-static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
+static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
  {
-	pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
+	pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
  }
#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
  #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
-#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
+#define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK))
#define pte_none(pte) (!pte_val(pte))
@@ -147,11 +147,11 @@ static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
  #define pmd_page(pmd)		virt_to_page(__va(pmd_val(pmd)))
-#define pgd_none(pgd) (!pgd_val(pgd))
-#define pgd_bad(pgd)		((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
-#define pgd_present(pgd)	(pgd_val(pgd) & _PAGE_TABLE)
-#define pgd_clear(pgdp)		({ pgd_val(*pgdp) = 0; })
-#define pgd_page(pgd)		(mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
+#define pud_none(pud)		(!pud_val(pud))
+#define pud_bad(pud)		((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
+#define pud_present(pud)	(pud_val(pud) & _PAGE_TABLE)
+#define pud_clear(pudp)		({ pud_val(*pudp) = 0; })
+#define pud_page(pud)		(mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
#define pte_ERROR(e) \
  	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
@@ -209,9 +209,9 @@ static inline pgd_t *pgd_offset_k(unsigned long address)
/* Find an entry in the second-level page table.. */
-static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
+static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
  {
-	return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
+	return (pmd_t *)pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
  }
/* Find an entry in the third-level page table.. */
@@ -239,11 +239,15 @@ static inline void nocache_page(void *vaddr)
if (CPU_IS_040_OR_060) {
  		pgd_t *dir;
+		p4d_t *p4dp;
+		pud_t *pudp;
  		pmd_t *pmdp;
  		pte_t *ptep;
dir = pgd_offset_k(addr);
-		pmdp = pmd_offset(dir, addr);
+		p4dp = p4d_offset(dir, addr);
+		pudp = pud_offset(p4dp, addr);
+		pmdp = pmd_offset(pudp, addr);
  		ptep = pte_offset_kernel(pmdp, addr);
  		*ptep = pte_mknocache(*ptep);
  	}
@@ -255,11 +259,15 @@ static inline void cache_page(void *vaddr)
if (CPU_IS_040_OR_060) {
  		pgd_t *dir;
+		p4d_t *p4dp;
+		pud_t *pudp;
  		pmd_t *pmdp;
  		pte_t *ptep;
dir = pgd_offset_k(addr);
-		pmdp = pmd_offset(dir, addr);
+		p4dp = p4d_offset(dir, addr);
+		pudp = pud_offset(p4dp, addr);
+		pmdp = pmd_offset(pudp, addr);
  		ptep = pte_offset_kernel(pmdp, addr);
  		*ptep = pte_mkcache(*ptep);
  	}
diff --git a/arch/m68k/include/asm/page.h b/arch/m68k/include/asm/page.h
index 700d819..c00b67a 100644
--- a/arch/m68k/include/asm/page.h
+++ b/arch/m68k/include/asm/page.h
@@ -21,19 +21,22 @@
  /*
   * These are used to make use of C type-checking..
   */
-typedef struct { unsigned long pte; } pte_t;
+#if CONFIG_PGTABLE_LEVELS == 3
  typedef struct { unsigned long pmd[16]; } pmd_t;
+#define pmd_val(x)	((&x)->pmd[0])
+#define __pmd(x)	((pmd_t) { { (x) }, })
+#endif
+
+typedef struct { unsigned long pte; } pte_t;
  typedef struct { unsigned long pgd; } pgd_t;
  typedef struct { unsigned long pgprot; } pgprot_t;
  typedef struct page *pgtable_t;
#define pte_val(x) ((x).pte)
-#define pmd_val(x)	((&x)->pmd[0])
  #define pgd_val(x)	((x).pgd)
  #define pgprot_val(x)	((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
-#define __pmd(x)	((pmd_t) { { (x) }, })
  #define __pgd(x)	((pgd_t) { (x) } )
  #define __pgprot(x)	((pgprot_t) { (x) } )
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index 646c174f..2bf5c35 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -2,7 +2,12 @@
  #ifndef _M68K_PGTABLE_H
  #define _M68K_PGTABLE_H
-#include <asm-generic/4level-fixup.h>
+
+#if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
+#include <asm-generic/pgtable-nopmd.h>
+#else
+#include <asm-generic/pgtable-nopud.h>
+#endif
#include <asm/setup.h> @@ -30,9 +35,7 @@ /* PMD_SHIFT determines the size of the area a second-level page table can map */
-#ifdef CONFIG_SUN3
-#define PMD_SHIFT       17
-#else
+#if CONFIG_PGTABLE_LEVELS == 3
  #define PMD_SHIFT	22
  #endif
  #define PMD_SIZE	(1UL << PMD_SHIFT)
diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index 8561211..11b95da 100644
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -17,8 +17,6 @@
extern const char bad_pmd_string[]; -#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
-
  #define __pte_free_tlb(tlb,pte,addr)			\
  do {							\
  	pgtable_pte_page_dtor(pte);			\
@@ -41,7 +39,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
   * inside the pgd, so has no extra memory associated with it.
   */
  #define pmd_free(mm, x)			do { } while (0)
-#define __pmd_free_tlb(tlb, x, addr)	do { } while (0)
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  {
@@ -58,6 +55,4 @@ static inline pgd_t * pgd_alloc(struct mm_struct *mm)
       return new_pgd;
  }
-#define pgd_populate(mm, pmd, pte) BUG()
-
  #endif /* SUN3_PGALLOC_H */
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
index c987d50..bc41552 100644
--- a/arch/m68k/include/asm/sun3_pgtable.h
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -110,11 +110,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
#define pmd_set(pmdp,ptep) do {} while (0) -static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
-{
-	pgd_val(*pgdp) = virt_to_phys(pmdp);
-}
-
  #define __pte_page(pte) \
  ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
  #define __pmd_page(pmd) \
@@ -145,16 +140,9 @@ static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_V
  #define pmd_present(pmd) (!pmd_none2(&(pmd)))
  static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
-static inline int pgd_none (pgd_t pgd) { return 0; }
-static inline int pgd_bad (pgd_t pgd) { return 0; }
-static inline int pgd_present (pgd_t pgd) { return 1; }
-static inline void pgd_clear (pgd_t *pgdp) {}
-
#define pte_ERROR(e) \
  	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
-#define pmd_ERROR(e) \
-	pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  #define pgd_ERROR(e) \
  	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
@@ -194,12 +182,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
  /* Find an entry in a kernel pagetable directory. */
  #define pgd_offset_k(address) pgd_offset(&init_mm, address)
-/* Find an entry in the second-level pagetable. */
-static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
-{
-	return (pmd_t *) pgd;
-}
-
  /* Find an entry in the third-level pagetable. */
  #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
  #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c
index 6363ec8..18a4de7 100644
--- a/arch/m68k/kernel/sys_m68k.c
+++ b/arch/m68k/kernel/sys_m68k.c
@@ -465,6 +465,8 @@ sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
  	for (;;) {
  		struct mm_struct *mm = current->mm;
  		pgd_t *pgd;
+		p4d_t *p4d;
+		pud_t *pud;
  		pmd_t *pmd;
  		pte_t *pte;
  		spinlock_t *ptl;
@@ -474,7 +476,13 @@ sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
  		pgd = pgd_offset(mm, (unsigned long)mem);
  		if (!pgd_present(*pgd))
  			goto bad_access;
-		pmd = pmd_offset(pgd, (unsigned long)mem);
+		p4d = p4d_offset(pgd, (unsigned long)mem);
+		if (!p4d_present(*p4d))
+			goto bad_access;
+		pud = pud_offset(p4d, (unsigned long)mem);
+		if (!pud_present(*pud))
+			goto bad_access;
+		pmd = pmd_offset(pud, (unsigned long)mem);
  		if (!pmd_present(*pmd))
  			goto bad_access;
  		pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index 778cacb..27c453f 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -130,8 +130,10 @@ static inline void init_pointer_tables(void)
  	/* insert pointer tables allocated so far into the tablelist */
  	init_pointer_table((unsigned long)kernel_pg_dir);
  	for (i = 0; i < PTRS_PER_PGD; i++) {
-		if (pgd_present(kernel_pg_dir[i]))
-			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
+		pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
+
+		if (pud_present(*pud))
+			init_pointer_table(pgd_page_vaddr(kernel_pg_dir[i]));
  	}
/* insert also pointer table that we used to unmap the zero page */
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
index 40a3b32..9f687da 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -110,6 +110,8 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
  	unsigned long virtaddr, retaddr;
  	long offset;
  	pgd_t *pgd_dir;
+	p4d_t *p4d_dir;
+	pud_t *pud_dir;
  	pmd_t *pmd_dir;
  	pte_t *pte_dir;
@@ -196,17 +198,21 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
  			printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
  #endif
  		pgd_dir = pgd_offset_k(virtaddr);
-		pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
+		p4d_dir = p4d_offset(pgd_dir, virtaddr);
+		pud_dir = pud_offset(p4d_dir, virtaddr);
+		pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
  		if (!pmd_dir) {
  			printk("ioremap: no mem for pmd_dir\n");
  			return NULL;
  		}
if (CPU_IS_020_OR_030) {
+#if CONFIG_PGTABLE_LEVELS == 3
  			pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
  			physaddr += PTRTREESIZE;
  			virtaddr += PTRTREESIZE;
  			size -= PTRTREESIZE;
+#endif
  		} else {
  			pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
  			if (!pte_dir) {
@@ -258,19 +264,24 @@ void __iounmap(void *addr, unsigned long size)
  {
  	unsigned long virtaddr = (unsigned long)addr;
  	pgd_t *pgd_dir;
+	p4d_t *p4d_dir;
+	pud_t *pud_dir;
  	pmd_t *pmd_dir;
  	pte_t *pte_dir;
while ((long)size > 0) {
  		pgd_dir = pgd_offset_k(virtaddr);
-		if (pgd_bad(*pgd_dir)) {
-			printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
-			pgd_clear(pgd_dir);
+		p4d_dir = p4d_offset(pgd_dir, virtaddr);
+		pud_dir = pud_offset(p4d_dir, virtaddr);
+		if (pud_bad(*pud_dir)) {
+			printk("iounmap: bad pgd(%08lx)\n", pud_val(*pud_dir));
+			pud_clear(pud_dir);
  			return;
  		}
-		pmd_dir = pmd_offset(pgd_dir, virtaddr);
+		pmd_dir = pmd_offset(pud_dir, virtaddr);
if (CPU_IS_020_OR_030) {
+#if CONFIG_PGTABLE_LEVELS == 3
  			int pmd_off = (virtaddr/PTRTREESIZE) & 15;
  			int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
@@ -281,6 +292,7 @@ void __iounmap(void *addr, unsigned long size)
  				continue;
  			} else if (pmd_type == 0)
  				continue;
+#endif
  		}
if (pmd_bad(*pmd_dir)) {
@@ -307,6 +319,8 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
  {
  	unsigned long virtaddr = (unsigned long)addr;
  	pgd_t *pgd_dir;
+	p4d_t *p4d_dir;
+	pud_t *pud_dir;
  	pmd_t *pmd_dir;
  	pte_t *pte_dir;
@@ -341,14 +355,17 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode) while ((long)size > 0) {
  		pgd_dir = pgd_offset_k(virtaddr);
-		if (pgd_bad(*pgd_dir)) {
-			printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
-			pgd_clear(pgd_dir);
+		p4d_dir = p4d_offset(pgd_dir, virtaddr);
+		pud_dir = pud_offset(p4d_dir, virtaddr);
+		if (pud_bad(*pud_dir)) {
+			printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
+			pud_clear(pud_dir);
  			return;
  		}
-		pmd_dir = pmd_offset(pgd_dir, virtaddr);
+		pmd_dir = pmd_offset(pud_dir, virtaddr);
if (CPU_IS_020_OR_030) {
+#if CONFIG_PGTABLE_LEVELS == 3
  			int pmd_off = (virtaddr/PTRTREESIZE) & 15;
if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
@@ -358,6 +375,7 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
  				size -= PTRTREESIZE;
  				continue;
  			}
+#endif
  		}
if (pmd_bad(*pmd_dir)) {
diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
index 6cb1e41..0ea3756 100644
--- a/arch/m68k/mm/mcfmmu.c
+++ b/arch/m68k/mm/mcfmmu.c
@@ -92,6 +92,8 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
  	unsigned long flags, mmuar, mmutr;
  	struct mm_struct *mm;
  	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
  	pmd_t *pmd;
  	pte_t *pte;
  	int asid;
@@ -113,7 +115,19 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
  		return -1;
  	}
- pmd = pmd_offset(pgd, mmuar);
+	p4d = p4d_offset(pgd, mmuar);
+	if (p4d_none(*p4d)) {
+		local_irq_restore(flags);
+		return -1;
+	}
+
+	pud = pud_offset(p4d, mmuar);
+	if (pud_none(*pud)) {
+		local_irq_restore(flags);
+		return -1;
+	}
+
+	pmd = pmd_offset(pud, mmuar);
  	if (pmd_none(*pmd)) {
  		local_irq_restore(flags);
  		return -1;
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 356601b..4857985 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -82,9 +82,11 @@ static pmd_t * __init kernel_ptr_table(void)
  		 */
  		last = (unsigned long)kernel_pg_dir;
  		for (i = 0; i < PTRS_PER_PGD; i++) {
-			if (!pgd_present(kernel_pg_dir[i]))
+			pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
+
+			if (!pud_present(*pud))
  				continue;
-			pmd = __pgd_page(kernel_pg_dir[i]);
+			pmd = pgd_page_vaddr(kernel_pg_dir[i]);
  			if (pmd > last)
  				last = pmd;
  		}
@@ -118,6 +120,8 @@ static void __init map_node(int node)
  #define ROOTTREESIZE (32*1024*1024)
  	unsigned long physaddr, virtaddr, size;
  	pgd_t *pgd_dir;
+	p4d_t *p4d_dir;
+	pud_t *pud_dir;
  	pmd_t *pmd_dir;
  	pte_t *pte_dir;
@@ -149,14 +153,16 @@ static void __init map_node(int node)
  				continue;
  			}
  		}
-		if (!pgd_present(*pgd_dir)) {
+		p4d_dir = p4d_offset(pgd_dir, virtaddr);
+		pud_dir = pud_offset(p4d_dir, virtaddr);
+		if (!pud_present(*pud_dir)) {
  			pmd_dir = kernel_ptr_table();
  #ifdef DEBUG
  			printk ("[new pointer %p]", pmd_dir);
  #endif
-			pgd_set(pgd_dir, pmd_dir);
+			pud_set(pud_dir, pmd_dir);
  		} else
-			pmd_dir = pmd_offset(pgd_dir, virtaddr);
+			pmd_dir = pmd_offset(pud_dir, virtaddr);
if (CPU_IS_020_OR_030) {
  			if (virtaddr) {
@@ -304,4 +310,3 @@ void __init paging_init(void)
  			node_set_state(i, N_NORMAL_MEMORY);
  	}
  }
-




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