x86: unify pgtable accessors which use

Make users of supported_pte_mask common.  This has the side-effect of
introducing the variable for 32-bit non-PAE, but I think its a pretty
small cost to simplify the code.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/mm/init_32.c

@@ -478,11 +478,12 @@ void zap_low_mappings (void)
 
 int nx_enabled = 0;
 
+pteval_t __supported_pte_mask __read_mostly = ~_PAGE_NX;
+EXPORT_SYMBOL_GPL(__supported_pte_mask);
+
 #ifdef CONFIG_X86_PAE
 
 static int disable_nx __initdata = 0;
-u64 __supported_pte_mask __read_mostly = ~_PAGE_NX;
-EXPORT_SYMBOL_GPL(__supported_pte_mask);
 
 /*
  * noexec = on|off

include/asm-x86/pgtable-2level.h

@@ -53,8 +53,6 @@ static inline pte_t native_ptep_get_and_clear(pte_t *xp)
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define pte_none(x)		(!(x).pte_low)
 #define pte_pfn(x)		(pte_val(x) >> PAGE_SHIFT)
-#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
-#define pfn_pmd(pfn, prot)	__pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 
 /*
  * All present pages are kernel-executable:

include/asm-x86/pgtable-3level.h

@@ -158,20 +158,6 @@ static inline unsigned long pte_pfn(pte_t pte)
 	return (pte_val(pte) & ~_PAGE_NX) >> PAGE_SHIFT;
 }
 
-extern unsigned long long __supported_pte_mask;
-
-static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
-{
-	return __pte((((unsigned long long)page_nr << PAGE_SHIFT) |
-		      pgprot_val(pgprot)) & __supported_pte_mask);
-}
-
-static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
-{
-	return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) |
-		      pgprot_val(pgprot)) & __supported_pte_mask);
-}
-
 /*
  * Bits 0, 6 and 7 are taken in the low part of the pte,
  * put the 32 bits of offset into the high part.

include/asm-x86/pgtable.h

@@ -141,6 +141,20 @@ static inline pte_t pte_mkwrite(pte_t pte)	{ return __pte(pte_val(pte) | _PAGE_R
 static inline pte_t pte_mkhuge(pte_t pte)	{ return __pte(pte_val(pte) | _PAGE_PSE); }
 static inline pte_t pte_clrhuge(pte_t pte)	{ return __pte(pte_val(pte) & ~_PAGE_PSE); }
 
+extern pteval_t __supported_pte_mask;
+
+static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
+{
+	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
+		      pgprot_val(pgprot)) & __supported_pte_mask);
+}
+
+static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
+{
+	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
+		      pgprot_val(pgprot)) & __supported_pte_mask);
+}
+
 #endif	/* __ASSEMBLY__ */
 
 #ifdef CONFIG_X86_32

include/asm-x86/pgtable_64.h

@@ -17,7 +17,6 @@ extern pud_t level3_kernel_pgt[512];
 extern pud_t level3_ident_pgt[512];
 extern pmd_t level2_kernel_pgt[512];
 extern pgd_t init_level4_pgt[];
-extern unsigned long __supported_pte_mask;
 
 #define swapper_pg_dir init_level4_pgt
 
@@ -165,14 +164,6 @@ static inline unsigned long pmd_bad(pmd_t pmd)
 #define pte_page(x)	pfn_to_page(pte_pfn(x))
 #define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 
-static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
-{
-	pte_t pte;
-	pte_val(pte) = (page_nr << PAGE_SHIFT);
-	pte_val(pte) |= pgprot_val(pgprot);
-	pte_val(pte) &= __supported_pte_mask;
-	return pte;
-}
 struct vm_area_struct;
 
 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
@@ -239,15 +230,6 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 /* page, protection -> pte */
 #define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
  
-/* Change flags of a PTE */
-static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
-{ 
-	pte_val(pte) &= _PAGE_CHG_MASK;
-	pte_val(pte) |= pgprot_val(newprot);
-	pte_val(pte) &= __supported_pte_mask;
-       return pte; 
-}
-
 #define pte_index(address) \
 		(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \