[PATCH] convert i386 to generic nopud header

i386 works with 2 and 3 levels
Signed-off-by: Andi Kleen <ak@suse.de>

Converted to use pud_t by Nick Piggin
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/vm86.c

@@ -137,6 +137,7 @@ struct pt_regs * fastcall save_v86_state(struct kernel_vm86_regs * regs)
 static void mark_screen_rdonly(struct task_struct * tsk)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte, *mapped;
 	int i;
@@ -151,7 +152,15 @@ static void mark_screen_rdonly(struct task_struct * tsk)
 		pgd_clear(pgd);
 		goto out;
 	}
-	pmd = pmd_offset(pgd, 0xA0000);
+	pud = pud_offset(pgd, 0xA0000);
+	if (pud_none(*pud))
+		goto out;
+	if (pud_bad(*pud)) {
+		pud_ERROR(*pud);
+		pud_clear(pud);
+		goto out;
+	}
+	pmd = pmd_offset(pud, 0xA0000);
 	if (pmd_none(*pmd))
 		goto out;
 	if (pmd_bad(*pmd)) {

arch/i386/mm/fault.c

@@ -518,6 +518,7 @@ fastcall void do_page_fault(struct pt_regs *regs, unsigned long error_code)
 		int index = pgd_index(address);
 		unsigned long pgd_paddr;
 		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
 		pmd_t *pmd, *pmd_k;
 		pte_t *pte_k;
 
@@ -530,11 +531,17 @@ fastcall void do_page_fault(struct pt_regs *regs, unsigned long error_code)
 
 		/*
 		 * set_pgd(pgd, *pgd_k); here would be useless on PAE
-		 * and redundant with the set_pmd() on non-PAE.
+		 * and redundant with the set_pmd() on non-PAE. As would
+		 * set_pud.
 		 */
 
-		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/i386/mm/hugetlbpage.c

@@ -21,20 +21,24 @@
 static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd = NULL;
 
 	pgd = pgd_offset(mm, addr);
-	pmd = pmd_alloc(mm, pgd, addr);
+	pud = pud_alloc(mm, pgd, addr);
+	pmd = pmd_alloc(mm, pud, addr);
 	return (pte_t *) pmd;
 }
 
 static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd = NULL;
 
 	pgd = pgd_offset(mm, addr);
-	pmd = pmd_offset(pgd, addr);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
 	return (pte_t *) pmd;
 }
 

arch/i386/mm/init.c

@@ -54,15 +54,18 @@ static int noinline do_test_wp_bit(void);
  */
 static pmd_t * __init one_md_table_init(pgd_t *pgd)
 {
+	pud_t *pud;
 	pmd_t *pmd_table;
 		
 #ifdef CONFIG_X86_PAE
 	pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
 	set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
-	if (pmd_table != pmd_offset(pgd, 0)) 
+	pud = pud_offset(pgd, 0);
+	if (pmd_table != pmd_offset(pud, 0)) 
 		BUG();
 #else
-	pmd_table = pmd_offset(pgd, 0);
+	pud = pud_offset(pgd, 0);
+	pmd_table = pmd_offset(pud, 0);
 #endif
 
 	return pmd_table;
@@ -100,6 +103,7 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
 static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	int pgd_idx, pmd_idx;
 	unsigned long vaddr;
@@ -112,8 +116,8 @@ static void __init page_table_range_init (unsigned long start, unsigned long end
 	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
 		if (pgd_none(*pgd)) 
 			one_md_table_init(pgd);
-
-		pmd = pmd_offset(pgd, vaddr);
+		pud = pud_offset(pgd, vaddr);
+		pmd = pmd_offset(pud, vaddr);
 		for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) {
 			if (pmd_none(*pmd)) 
 				one_page_table_init(pmd);
@@ -233,7 +237,7 @@ EXPORT_SYMBOL(kmap_prot);
 EXPORT_SYMBOL(kmap_pte);
 
 #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))
 
 void __init kmap_init(void)
 {
@@ -249,6 +253,7 @@ void __init kmap_init(void)
 void __init permanent_kmaps_init(pgd_t *pgd_base)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
 	unsigned long vaddr;
@@ -257,7 +262,8 @@ void __init permanent_kmaps_init(pgd_t *pgd_base)
 	page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
 
 	pgd = swapper_pg_dir + pgd_index(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;	
 }

arch/i386/mm/ioremap.c

@@ -80,9 +80,14 @@ static int remap_area_pages(unsigned long address, unsigned long 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,

arch/i386/mm/pageattr.c

@@ -19,11 +19,15 @@ static struct list_head df_list = LIST_HEAD_INIT(df_list);
 
 pte_t *lookup_address(unsigned long address) 
 { 
-	pgd_t *pgd = pgd_offset_k(address); 
+	pgd_t *pgd = pgd_offset_k(address);
+	pud_t *pud;
 	pmd_t *pmd;
 	if (pgd_none(*pgd))
 		return NULL;
-	pmd = pmd_offset(pgd, address); 	       
+	pud = pud_offset(pgd, address);
+	if (pud_none(*pud))
+		return NULL;
+	pmd = pmd_offset(pud, address);
 	if (pmd_none(*pmd))
 		return NULL;
 	if (pmd_large(*pmd))
@@ -77,9 +81,11 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
 	spin_lock_irqsave(&pgd_lock, flags);
 	for (page = pgd_list; page; page = (struct page *)page->index) {
 		pgd_t *pgd;
+		pud_t *pud;
 		pmd_t *pmd;
 		pgd = (pgd_t *)page_address(page) + pgd_index(address);
-		pmd = pmd_offset(pgd, address);
+		pud = pud_offset(pgd, address);
+		pmd = pmd_offset(pud, address);
 		set_pte_atomic((pte_t *)pmd, pte);
 	}
 	spin_unlock_irqrestore(&pgd_lock, flags);
@@ -92,7 +98,7 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
 static inline void revert_page(struct page *kpte_page, unsigned long address)
 {
 	pte_t *linear = (pte_t *) 
-		pmd_offset(pgd_offset(&init_mm, address), address);
+		pmd_offset(pud_offset(pgd_offset_k(address), address), address);
 	set_pmd_pte(linear,  address,
 		    pfn_pte((__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT,
 			    PAGE_KERNEL_LARGE));

arch/i386/mm/pgtable.c

@@ -62,6 +62,7 @@ void show_mem(void)
 static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
 
@@ -70,7 +71,12 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 		BUG();
 		return;
 	}
-	pmd = pmd_offset(pgd, vaddr);
+	pud = pud_offset(pgd, vaddr);
+	if (pud_none(*pud)) {
+		BUG();
+		return;
+	}
+	pmd = pmd_offset(pud, vaddr);
 	if (pmd_none(*pmd)) {
 		BUG();
 		return;
@@ -95,6 +101,7 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 {
 	pgd_t *pgd;
+	pud_t *pud;
 	pmd_t *pmd;
 
 	if (vaddr & (PMD_SIZE-1)) {		/* vaddr is misaligned */
@@ -110,7 +117,8 @@ void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
 		printk ("set_pmd_pfn: pgd_none\n");
 		return; /* BUG(); */
 	}
-	pmd = pmd_offset(pgd, vaddr);
+	pud = pud_offset(pgd, vaddr);
+	pmd = pmd_offset(pud, vaddr);
 	set_pmd(pmd, pfn_pmd(pfn, flags));
 	/*
 	 * It's enough to flush this one mapping.

include/asm-i386/pgalloc.h

@@ -17,7 +17,6 @@
 /*
  * Allocate and free page tables.
  */
-
 extern pgd_t *pgd_alloc(struct mm_struct *);
 extern void pgd_free(pgd_t *pgd);
 
@@ -44,7 +43,7 @@ static inline void pte_free(struct page *pte)
 #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)
-#define pgd_populate(mm, pmd, pte)	BUG()
+#define pud_populate(mm, pmd, pte)	BUG()
 #endif
 
 #define check_pgt_cache()	do { } while (0)

include/asm-i386/pgtable-3level.h

 #ifndef _I386_PGTABLE_3LEVEL_H
 #define _I386_PGTABLE_3LEVEL_H
 
+#include <asm-generic/pgtable-nopud.h>
+
 /*
  * Intel Physical Address Extension (PAE) Mode - three-level page
  * tables on PPro+ CPUs.
@@ -15,9 +17,9 @@
 #define pgd_ERROR(e) \
 	printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
 
-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; }
+#define pud_none(pud)				0
+#define pud_bad(pud)				0
+#define pud_present(pud)			1
 
 /*
  * Is the pte executable?
@@ -59,8 +61,8 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
 		set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
 #define set_pmd(pmdptr,pmdval) \
 		set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
-#define set_pgd(pgdptr,pgdval) \
-		set_64bit((unsigned long long *)(pgdptr),pgd_val(pgdval))
+#define set_pud(pudptr,pudval) \
+		set_64bit((unsigned long long *)(pudptr),pud_val(pudval))
 
 /*
  * Pentium-II erratum A13: in PAE mode we explicitly have to flush
@@ -68,22 +70,22 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
  * We do not let the generic code free and clear pgd entries due to
  * this erratum.
  */
-static inline void pgd_clear (pgd_t * pgd) { }
+static inline void pud_clear (pud_t * pud) { }
 
 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 
 #define pmd_page_kernel(pmd) \
 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 
-#define pgd_page(pgd) \
-((struct page *) __va(pgd_val(pgd) & PAGE_MASK))
+#define pud_page(pud) \
+((struct page *) __va(pud_val(pud) & PAGE_MASK))
 
-#define pgd_page_kernel(pgd) \
-((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+#define pud_page_kernel(pud) \
+((unsigned long) __va(pud_val(pud) & PAGE_MASK))
 
 
 /* Find an entry in the second-level page table.. */
-#define pmd_offset(dir, address) ((pmd_t *) pgd_page(*(dir)) + \
+#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
 			pmd_index(address))
 
 static inline pte_t ptep_get_and_clear(pte_t *ptep)

include/asm-i386/pgtable.h

@@ -303,6 +303,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
  * control the given virtual address
  */
 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_index_k(addr) pgd_index(addr)
 
 /*
  * pgd_offset() returns a (pgd_t *)