Update MIPS to use the 4-level pagetable code thereby getting rid of

the compacrapability headers.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/lib-32/dump_tlb.c

@@ -139,6 +139,7 @@ void dump_tlb_nonwired(void)
 void dump_list_process(struct task_struct *t, void *address)
 {
 	pgd_t	*page_dir, *pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte, page;
 	unsigned long addr, val;
@@ -162,7 +163,10 @@ void dump_list_process(struct task_struct *t, void *address)
 		pgd = pgd_offset(t->mm, addr);
 	printk("pgd == %08x, ", (unsigned int) pgd);
 
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	printk("pud == %08x, ", (unsigned int) pud);
+
+	pmd = pmd_offset(pud, addr);
 	printk("pmd == %08x, ", (unsigned int) pmd);
 
 	pte = pte_offset(pmd, addr);
@@ -195,13 +199,15 @@ void dump_list_current(void *address)
 unsigned int vtop(void *address)
 {
 	pgd_t	*pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte;
 	unsigned int addr, paddr;
 
 	addr = (unsigned long) address;
 	pgd = pgd_offset(current->mm, addr);
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
 	pte = pte_offset(pmd, addr);
 	paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 	paddr |= (addr & ~PAGE_MASK);

arch/mips/lib-32/r3k_dump_tlb.c

@@ -105,6 +105,7 @@ void dump_tlb_nonwired(void)
 void dump_list_process(struct task_struct *t, void *address)
 {
 	pgd_t	*page_dir, *pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte, page;
 	unsigned int addr;
@@ -121,7 +122,10 @@ void dump_list_process(struct task_struct *t, void *address)
 	pgd = pgd_offset(t->mm, addr);
 	printk("pgd == %08x, ", (unsigned int) pgd);
 
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	printk("pud == %08x, ", (unsigned int) pud);
+
+	pmd = pmd_offset(pud, addr);
 	printk("pmd == %08x, ", (unsigned int) pmd);
 
 	pte = pte_offset(pmd, addr);
@@ -149,13 +153,15 @@ void dump_list_current(void *address)
 unsigned int vtop(void *address)
 {
 	pgd_t	*pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte;
 	unsigned int addr, paddr;
 
 	addr = (unsigned long) address;
 	pgd = pgd_offset(current->mm, addr);
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
 	pte = pte_offset(pmd, addr);
 	paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 	paddr |= (addr & ~PAGE_MASK);

arch/mips/lib-64/dump_tlb.c

@@ -140,6 +140,7 @@ void dump_tlb_nonwired(void)
 void dump_list_process(struct task_struct *t, void *address)
 {
 	pgd_t	*page_dir, *pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte, page;
 	unsigned long addr, val;
@@ -155,7 +156,10 @@ void dump_list_process(struct task_struct *t, void *address)
 	pgd = pgd_offset(t->mm, addr);
 	printk("pgd == %016lx\n", (unsigned long) pgd);
 
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	printk("pud == %016lx\n", (unsigned long) pud);
+
+	pmd = pmd_offset(pud, addr);
 	printk("pmd == %016lx\n", (unsigned long) pmd);
 
 	pte = pte_offset(pmd, addr);
@@ -184,13 +188,15 @@ void dump_list_current(void *address)
 unsigned int vtop(void *address)
 {
 	pgd_t	*pgd;
+	pud_t	*pud;
 	pmd_t	*pmd;
 	pte_t	*pte;
 	unsigned int addr, paddr;
 
 	addr = (unsigned long) address;
 	pgd = pgd_offset(current->mm, addr);
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
 	pte = pte_offset(pmd, addr);
 	paddr = (CKSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 	paddr |= (addr & ~PAGE_MASK);

arch/mips/mm/c-r3k.c

@@ -221,12 +221,14 @@ static inline unsigned long get_phys_page (unsigned long addr,
 					   struct mm_struct *mm)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
 	unsigned long physpage;
 
 	pgd = pgd_offset(mm, addr);
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
 	pte = pte_offset(pmd, addr);
 
 	if ((physpage = pte_val(*pte)) & _PAGE_VALID)

arch/mips/mm/c-r4k.c

@@ -372,12 +372,14 @@ static inline void local_r4k_flush_cache_page(void *args)
 	int exec = vma->vm_flags & VM_EXEC;
 	struct mm_struct *mm = vma->vm_mm;
 	pgd_t *pgdp;
+	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
 
 	page &= PAGE_MASK;
 	pgdp = pgd_offset(mm, page);
-	pmdp = pmd_offset(pgdp, page);
+	pudp = pud_offset(pgdp, page);
+	pmdp = pmd_offset(pudp, page);
 	ptep = pte_offset(pmdp, page);
 
 	/*

arch/mips/mm/c-tx39.c

@@ -183,6 +183,7 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
 	int exec = vma->vm_flags & VM_EXEC;
 	struct mm_struct *mm = vma->vm_mm;
 	pgd_t *pgdp;
+	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
 
@@ -195,7 +196,8 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
 
 	page &= PAGE_MASK;
 	pgdp = pgd_offset(mm, page);
-	pmdp = pmd_offset(pgdp, page);
+	pudp = pud_offset(pgdp, page);
+	pmdp = pmd_offset(pudp, page);
 	ptep = pte_offset(pmdp, page);
 
 	/*

arch/mips/mm/fault.c

@@ -212,6 +212,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 		 */
 		int offset = __pgd_offset(address);
 		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
 
@@ -222,8 +223,13 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 			goto no_context;
 		set_pgd(pgd, *pgd_k);
 
-		pmd = pmd_offset(pgd, address);
-		pmd_k = pmd_offset(pgd_k, address);
+		pud = pud_offset(pgd, address);
+		pud_k = pud_offset(pgd_k, address);
+		if (!pud_present(*pud_k))
+			goto no_context;
+
+		pmd = pmd_offset(pud, address);
+		pmd_k = pmd_offset(pud_k, address);
 		if (!pmd_present(*pmd_k))
 			goto no_context;
 		set_pmd(pmd, *pmd_k);

arch/mips/mm/init.c

@@ -83,7 +83,7 @@ pte_t *kmap_pte;
 pgprot_t kmap_prot;
 
 #define kmap_get_fixmap_pte(vaddr)					\
-	pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
+	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
 
 static void __init kmap_init(void)
 {
@@ -101,26 +101,32 @@ void __init fixrange_init(unsigned long start, unsigned long end,
 	pgd_t *pgd_base)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
-	int i, j;
+	int i, j, k;
 	unsigned long vaddr;
 
 	vaddr = start;
 	i = __pgd_offset(vaddr);
-	j = __pmd_offset(vaddr);
+	j = __pud_offset(vaddr);
+	k = __pmd_offset(vaddr);
 	pgd = pgd_base + i;
 
 	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
-		pmd = (pmd_t *)pgd;
-		for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
-			if (pmd_none(*pmd)) {
-				pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-				set_pmd(pmd, __pmd(pte));
-				if (pte != pte_offset_kernel(pmd, 0))
-					BUG();
+		pud = (pud_t *)pgd;
+		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+			pmd = (pmd_t *)pud;
+			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+				if (pmd_none(*pmd)) {
+					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+					set_pmd(pmd, __pmd(pte));
+					if (pte != pte_offset_kernel(pmd, 0))
+						BUG();
+				}
+				vaddr += PMD_SIZE;
 			}
-			vaddr += PMD_SIZE;
+			k = 0;
 		}
 		j = 0;
 	}

arch/mips/mm/ioremap.c

@@ -79,9 +79,14 @@ static int remap_area_pages(unsigned long address, phys_t phys_addr,
 		BUG();
 	spin_lock(&init_mm.page_table_lock);
 	do {
+		pud_t *pud;
 		pmd_t *pmd;
-		pmd = pmd_alloc(&init_mm, dir, address);
+
 		error = -ENOMEM;
+		pud = pud_alloc(&init_mm, dir, address);
+		if (!pud)
+			break;
+		pmd = pmd_alloc(&init_mm, pud, address);
 		if (!pmd)
 			break;
 		if (remap_area_pmd(pmd, address, end - address,
@@ -141,7 +146,7 @@ void * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
 	 */
 	if (IS_LOW512(phys_addr) && IS_LOW512(last_addr) &&
 	    flags == _CACHE_UNCACHED)
-		return (void *) KSEG1ADDR(phys_addr);
+		return (void *) CKSEG1ADDR(phys_addr);
 
 	/*
 	 * Don't allow anybody to remap normal RAM that we're using..
@@ -180,7 +185,7 @@ void * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
 	return (void *) (offset + (char *)addr);
 }
 
-#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == KSEG1)
+#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
 
 void __iounmap(volatile void __iomem *addr)
 {
@@ -190,10 +195,8 @@ void __iounmap(volatile void __iomem *addr)
 		return;
 
 	p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
-	if (!p) {
+	if (!p)
 		printk(KERN_ERR "iounmap: bad address %p\n", addr);
-		return;
-	}
 
         kfree(p);
 }

arch/mips/mm/pgtable-32.c

@@ -35,6 +35,7 @@ void __init pagetable_init(void)
 #ifdef CONFIG_HIGHMEM
 	unsigned long vaddr;
 	pgd_t *pgd, *pgd_base;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
 #endif
@@ -60,7 +61,8 @@ void __init pagetable_init(void)
 	fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
 
 	pgd = swapper_pg_dir + __pgd_offset(vaddr);
-	pmd = pmd_offset(pgd, vaddr);
+	pud = pud_offset(pgd, vaddr);
+	pmd = pmd_offset(pud, vaddr);
 	pte = pte_offset_kernel(pmd, vaddr);
 	pkmap_page_table = pte;
 #endif

arch/mips/mm/tlb-andes.c

@@ -195,6 +195,7 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
 {
 	unsigned long flags;
 	pgd_t *pgdp;
+	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
 	int idx, pid;
@@ -220,7 +221,8 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
 	write_c0_entryhi(address | (pid));
 	pgdp = pgd_offset(vma->vm_mm, address);
 	tlb_probe();
-	pmdp = pmd_offset(pgdp, address);
+	pudp = pud_offset(pgdp, address);
+	pmdp = pmd_offset(pudp, address);
 	idx = read_c0_index();
 	ptep = pte_offset_map(pmdp, address);
 	write_c0_entrylo0(pte_val(*ptep++) >> 6);

arch/mips/mm/tlb-r4k.c

@@ -227,6 +227,7 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
 {
 	unsigned long flags;
 	pgd_t *pgdp;
+	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep;
 	int idx, pid;
@@ -246,7 +247,8 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
 	mtc0_tlbw_hazard();
 	tlb_probe();
 	BARRIER;
-	pmdp = pmd_offset(pgdp, address);
+	pudp = pud_offset(pgdp, address);
+	pmdp = pmd_offset(pudp, address);
 	idx = read_c0_index();
 	ptep = pte_offset_map(pmdp, address);
 

include/asm-mips/page.h

@@ -87,22 +87,48 @@ static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 typedef struct { unsigned long pte; } pte_t;
 #define pte_val(x)	((x).pte)
 #endif
+#define __pte(x)	((pte_t) { (x) } )
 
-typedef struct { unsigned long pmd; } pmd_t;
-typedef struct { unsigned long pgd; } pgd_t;
-typedef struct { unsigned long pgprot; } pgprot_t;
+/*
+ * For 3-level pagetables we defines these ourselves, for 2-level the
+ * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
+ */
+#ifdef CONFIG_64BIT
 
+typedef struct { unsigned long pmd; } pmd_t;
 #define pmd_val(x)	((x).pmd)
-#define pgd_val(x)	((x).pgd)
-#define pgprot_val(x)	((x).pgprot)
+#define __pmd(x)	((pmd_t) { (x) } )
 
-#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+#endif
 
-#define __pte(x)	((pte_t) { (x) } )
-#define __pmd(x)	((pmd_t) { (x) } )
+/*
+ * Right now we don't support 4-level pagetables, so all pud-related
+ * definitions come from <asm-generic/pgtable-nopud.h>.
+ */
+
+/*
+ * Finall the top of the hierarchy, the pgd
+ */
+typedef struct { unsigned long pgd; } pgd_t;
+#define pgd_val(x)	((x).pgd)
 #define __pgd(x)	((pgd_t) { (x) } )
+
+/*
+ * Manipulate page protection bits
+ */
+typedef struct { unsigned long pgprot; } pgprot_t;
+#define pgprot_val(x)	((x).pgprot)
 #define __pgprot(x)	((pgprot_t) { (x) } )
 
+/*
+ * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
+ * pair of pages we only have a single global bit per pair of pages.  When
+ * writing to the TLB make sure we always have the bit set for both pages
+ * or none.  This macro is used to access the `buddy' of the pte we're just
+ * working on.
+ */
+#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+
 #endif /* !__ASSEMBLY__ */
 
 /* to align the pointer to the (next) page boundary */

include/asm-mips/pgalloc.h

@@ -25,11 +25,23 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
 }
 
+/*
+ * Initialize a new pmd table with invalid pointers.
+ */
+extern void pmd_init(unsigned long page, unsigned long pagetable);
+
+#ifdef CONFIG_64BIT
+
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+	set_pud(pud, __pud((unsigned long)pmd));
+}
+#endif
+
 /*
  * Initialize a new pgd / pmd table with invalid pointers.
  */
 extern void pgd_init(unsigned long page);
-extern void pmd_init(unsigned long page, unsigned long pagetable);
 
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
@@ -86,21 +98,18 @@ static inline void pte_free(struct page *pte)
 #define __pte_free_tlb(tlb,pte)		tlb_remove_page((tlb),(pte))
 
 #ifdef CONFIG_32BIT
-#define pgd_populate(mm, pmd, pte)	BUG()
 
 /*
  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  * inside the pgd, so has no extra memory associated with it.
  */
-#define pmd_alloc_one(mm, addr)		({ BUG(); ((pmd_t *)2); })
 #define pmd_free(x)			do { } while (0)
 #define __pmd_free_tlb(tlb,x)		do { } while (0)
+
 #endif
 
 #ifdef CONFIG_64BIT
 
-#define pgd_populate(mm, pgd, pmd)	set_pgd(pgd, __pgd(pmd))
-
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	pmd_t *pmd;

include/asm-mips/pgtable-32.h

@@ -17,6 +17,8 @@
 #include <asm/cachectl.h>
 #include <asm/fixmap.h>
 
+#include <asm-generic/pgtable-nopmd.h>
+
 /*
  * - add_wired_entry() add a fixed TLB entry, and move wired register
  */
@@ -42,35 +44,35 @@ extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
  */
 
 /* PMD_SHIFT determines the size of the area a second-level page table can map */
-#ifdef CONFIG_64BIT_PHYS_ADDR
-#define PMD_SHIFT	21
-#else
-#define PMD_SHIFT	22
-#endif
 #define PMD_SIZE	(1UL << PMD_SHIFT)
 #define PMD_MASK	(~(PMD_SIZE-1))
 
 /* PGDIR_SHIFT determines what a third-level page table entry can map */
-#define PGDIR_SHIFT	PMD_SHIFT
+#ifdef CONFIG_64BIT_PHYS_ADDR
+#define PGDIR_SHIFT	21
+#else
+#define PGDIR_SHIFT	22
+#endif
 #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
 /*
  * Entries per page directory level: we use two-level, so
- * we don't really have any PMD directory physically.
+ * we don't really have any PUD/PMD directory physically.
  */
 #ifdef CONFIG_64BIT_PHYS_ADDR
 #define PGD_ORDER	1
-#define PMD_ORDER	0
+#define PUD_ORDER	aieeee_attempt_to_allocate_pud
+#define PMD_ORDER	1
 #define PTE_ORDER	0
 #else
 #define PGD_ORDER	0
-#define PMD_ORDER	0
+#define PUD_ORDER	aieeee_attempt_to_allocate_pud
+#define PMD_ORDER	1
 #define PTE_ORDER	0
 #endif
 
 #define PTRS_PER_PGD	((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
-#define PTRS_PER_PMD	1
 #define PTRS_PER_PTE	((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
 
 #define USER_PTRS_PER_PGD	(0x80000000UL/PGDIR_SIZE)
@@ -91,8 +93,6 @@ extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
 #define pte_ERROR(e) \
 	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 #endif
-#define pmd_ERROR(e) \
-	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 #define pgd_ERROR(e) \
 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 
@@ -120,16 +120,6 @@ static inline void pmd_clear(pmd_t *pmdp)
 	pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
 }
 
-/*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
- * setup: the pgd is never bad, and a pmd always exists (as it's folded
- * into the pgd entry)
- */
-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)	{ }
-
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define pte_pfn(x)		((unsigned long)((x).pte_high >> 6))
@@ -166,12 +156,6 @@ pfn_pte(unsigned long pfn, pgprot_t prot)
 /* to find an entry in a page-table-directory */
 #define pgd_offset(mm,addr)	((mm)->pgd + pgd_index(addr))
 
-/* Find an entry in the second-level page table.. */
-static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
-{
-	return (pmd_t *) dir;
-}
-
 /* Find an entry in the third-level page table.. */
 #define __pte_offset(address)						\
 	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

include/asm-mips/pgtable-64.h

@@ -16,13 +16,15 @@
 #include <asm/page.h>
 #include <asm/cachectl.h>
 
+#include <asm-generic/pgtable-nopud.h>
+
 /*
  * Each address space has 2 4K pages as its page directory, giving 1024
  * (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a
- * pair of 4K pages, giving 1024 (== PTRS_PER_PMD) 8 byte pointers to
- * page tables. Each page table is a single 4K page, giving 512 (==
- * PTRS_PER_PTE) 8 byte ptes. Each pgde is initialized to point to
- * invalid_pmd_table, each pmde is initialized to point to
+ * single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
+ * tables. Each page table is also a single 4K page, giving 512 (==
+ * PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to
+ * invalid_pmd_table, each pmd entry is initialized to point to
  * invalid_pte_table, each pte is initialized to 0. When memory is low,
  * and a pmd table or a page table allocation fails, empty_bad_pmd_table
  * and empty_bad_page_table is returned back to higher layer code, so
@@ -36,17 +38,17 @@
  */
 
 /* PMD_SHIFT determines the size of the area a second-level page table can map */
-#define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT - 3))
+#define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
 #define PMD_SIZE	(1UL << PMD_SHIFT)
 #define PMD_MASK	(~(PMD_SIZE-1))
 
 /* PGDIR_SHIFT determines what a third-level page table entry can map */
-#define PGDIR_SHIFT	(PMD_SHIFT + (PAGE_SHIFT + 1 - 3))
+#define PGDIR_SHIFT	(PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
 #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
 /*
- * For 4kB page size we use a 3 level page tree and a 8kB pmd and pgds which
+ * For 4kB page size we use a 3 level page tree and an 8kB pud, which
  * permits us mapping 40 bits of virtual address space.
  *
  * We used to implement 41 bits by having an order 1 pmd level but that seemed
@@ -65,21 +67,25 @@
  */
 #ifdef CONFIG_PAGE_SIZE_4KB
 #define PGD_ORDER		1
+#define PUD_ORDER		aieeee_attempt_to_allocate_pud
 #define PMD_ORDER		0
 #define PTE_ORDER		0
 #endif
 #ifdef CONFIG_PAGE_SIZE_8KB
 #define PGD_ORDER		0
+#define PUD_ORDER		aieeee_attempt_to_allocate_pud
 #define PMD_ORDER		0
 #define PTE_ORDER		0
 #endif
 #ifdef CONFIG_PAGE_SIZE_16KB
 #define PGD_ORDER		0
+#define PUD_ORDER		aieeee_attempt_to_allocate_pud
 #define PMD_ORDER		0
 #define PTE_ORDER		0
 #endif
 #ifdef CONFIG_PAGE_SIZE_64KB
 #define PGD_ORDER		0
+#define PUD_ORDER		aieeee_attempt_to_allocate_pud
 #define PMD_ORDER		0
 #define PTE_ORDER		0
 #endif
@@ -102,10 +108,10 @@
 #define pgd_ERROR(e) \
 	printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
 
-extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
-extern pte_t empty_bad_page_table[PAGE_SIZE/sizeof(pte_t)];
-extern pmd_t invalid_pmd_table[2*PAGE_SIZE/sizeof(pmd_t)];
-extern pmd_t empty_bad_pmd_table[2*PAGE_SIZE/sizeof(pmd_t)];
+extern pte_t invalid_pte_table[PTRS_PER_PTE];
+extern pte_t empty_bad_page_table[PTRS_PER_PTE];
+extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
+extern pmd_t empty_bad_pmd_table[PTRS_PER_PMD];
 
 /*
  * Empty pmd entries point to the invalid_pte_table.
@@ -130,21 +136,24 @@ static inline void pmd_clear(pmd_t *pmdp)
 /*
  * Empty pgd entries point to the invalid_pmd_table.
  */
-static inline int pgd_none(pgd_t pgd)
+static inline int pud_none(pud_t pud)
 {
-	return pgd_val(pgd) == (unsigned long) invalid_pmd_table;
+	return pud_val(pud) == (unsigned long) invalid_pmd_table;
 }
 
-#define pgd_bad(pgd)		(pgd_val(pgd) &~ PAGE_MASK)
+static inline int pud_bad(pud_t pud)
+{
+	return pud_val(pud) & ~PAGE_MASK;
+}
 
-static inline int pgd_present(pgd_t pgd)
+static inline int pud_present(pud_t pud)
 {
-	return pgd_val(pgd) != (unsigned long) invalid_pmd_table;
+	return pud_val(pud) != (unsigned long) invalid_pmd_table;
 }
 
-static inline void pgd_clear(pgd_t *pgdp)
+static inline void pud_clear(pud_t *pudp)
 {
-	pgd_val(*pgdp) = ((unsigned long) invalid_pmd_table);
+	pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
 }
 
 #define pte_page(x)		pfn_to_page((unsigned long)((pte_val(x) >> PAGE_SHIFT)))
@@ -162,20 +171,20 @@ static inline void pgd_clear(pgd_t *pgdp)
 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(address) pgd_offset(&init_mm, 0)
 
-#define pgd_index(address)		((address) >> PGDIR_SHIFT)
+#define pgd_index(address)		(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 
 /* to find an entry in a page-table-directory */
 #define pgd_offset(mm,addr)	((mm)->pgd + pgd_index(addr))
 
-static inline unsigned long pgd_page(pgd_t pgd)
+static inline unsigned long pud_page(pud_t pud)
 {
-	return pgd_val(pgd);
+	return pud_val(pud);
 }
 
 /* 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 * pud, unsigned long address)
 {
-	return (pmd_t *) pgd_page(*dir) +
+	return (pmd_t *) pud_page(*pud) +
 	       ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 }
 

include/asm-mips/pgtable.h

@@ -8,8 +8,6 @@
 #ifndef _ASM_PGTABLE_H
 #define _ASM_PGTABLE_H
 
-#include <asm-generic/4level-fixup.h>
-
 #include <linux/config.h>
 #ifdef CONFIG_32BIT
 #include <asm/pgtable-32.h>
@@ -148,11 +146,18 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 #endif
 
 /*
- * (pmds are folded into pgds so this doesn't get actually called,
+ * (pmds are folded into puds so this doesn't get actually called,
  * but the define is needed for a generic inline function.)
  */
 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
-#define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
+
+#ifdef CONFIG_64BIT
+/*
+ * (puds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
+#endif
 
 #define PGD_T_LOG2	ffz(~sizeof(pgd_t))
 #define PMD_T_LOG2	ffz(~sizeof(pmd_t))