[SPARC64]: Use inline patching for critical PTE operations.

This handles the SUN4U vs SUN4V PTE layout differences
with near zero performance cost.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/mm/init.c

@@ -1502,217 +1502,12 @@ unsigned long pte_sz_bits(unsigned long sz)
 pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space, unsigned long page_size)
 {
 	pte_t pte;
-	if (tlb_type == hypervisor) {
-		pte_val(pte) = (((page) | pgprot_val(prot) | _PAGE_E_4V) &
-				~(unsigned long)_PAGE_CACHE_4V);
-	} else {
-		pte_val(pte) = (((page) | pgprot_val(prot) | _PAGE_E_4U) &
-				~(unsigned long)_PAGE_CACHE_4U);
-	}
+
+	pte_val(pte)  = page | pgprot_val(pgprot_noncached(prot));
 	pte_val(pte) |= (((unsigned long)space) << 32);
 	pte_val(pte) |= pte_sz_bits(page_size);
-	return pte;
-}
-
-unsigned long pte_present(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_PRESENT_4V : _PAGE_PRESENT_4U));
-}
-
-unsigned long pte_file(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_FILE_4V : _PAGE_FILE_4U));
-}
-
-unsigned long pte_read(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_READ_4V : _PAGE_READ_4U));
-}
-
-unsigned long pte_exec(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_EXEC_4V : _PAGE_EXEC_4U));
-}
-
-unsigned long pte_write(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_WRITE_4V : _PAGE_WRITE_4U));
-}
-
-unsigned long pte_dirty(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_MODIFIED_4V : _PAGE_MODIFIED_4U));
-}
-
-unsigned long pte_young(pte_t pte)
-{
-	return (pte_val(pte) &
-		((tlb_type == hypervisor) ?
-		 _PAGE_ACCESSED_4V : _PAGE_ACCESSED_4U));
-}
 
-pte_t pte_wrprotect(pte_t pte)
-{
-	unsigned long mask = _PAGE_WRITE_4U | _PAGE_W_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_WRITE_4V | _PAGE_W_4V;
-
-	return __pte(pte_val(pte) & ~mask);
-}
-
-pte_t pte_rdprotect(pte_t pte)
-{
-	unsigned long mask = _PAGE_R | _PAGE_READ_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_R | _PAGE_READ_4V;
-
-	return __pte(pte_val(pte) & ~mask);
-}
-
-pte_t pte_mkclean(pte_t pte)
-{
-	unsigned long mask = _PAGE_MODIFIED_4U | _PAGE_W_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_MODIFIED_4V | _PAGE_W_4V;
-
-	return __pte(pte_val(pte) & ~mask);
-}
-
-pte_t pte_mkold(pte_t pte)
-{
-	unsigned long mask = _PAGE_R | _PAGE_ACCESSED_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_R | _PAGE_ACCESSED_4V;
-
-	return __pte(pte_val(pte) & ~mask);
-}
-
-pte_t pte_mkyoung(pte_t pte)
-{
-	unsigned long mask = _PAGE_R | _PAGE_ACCESSED_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_R | _PAGE_ACCESSED_4V;
-
-	return __pte(pte_val(pte) | mask);
-}
-
-pte_t pte_mkwrite(pte_t pte)
-{
-	unsigned long mask = _PAGE_WRITE_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_WRITE_4V;
-
-	return __pte(pte_val(pte) | mask);
-}
-
-pte_t pte_mkdirty(pte_t pte)
-{
-	unsigned long mask = _PAGE_MODIFIED_4U | _PAGE_W_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_MODIFIED_4V | _PAGE_W_4V;
-
-	return __pte(pte_val(pte) | mask);
-}
-
-pte_t pte_mkhuge(pte_t pte)
-{
-	unsigned long mask = _PAGE_SZHUGE_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_SZHUGE_4V;
-
-	return __pte(pte_val(pte) | mask);
-}
-
-pte_t pgoff_to_pte(unsigned long off)
-{
-	unsigned long bit = _PAGE_FILE_4U;
-
-	if (tlb_type == hypervisor)
-		bit = _PAGE_FILE_4V;
-
-	return __pte((off << PAGE_SHIFT) | bit);
-}
-
-pgprot_t pgprot_noncached(pgprot_t prot)
-{
-	unsigned long val = pgprot_val(prot);
-	unsigned long off = _PAGE_CP_4U | _PAGE_CV_4U;
-	unsigned long on = _PAGE_E_4U;
-
-	if (tlb_type == hypervisor) {
-		off = _PAGE_CP_4V | _PAGE_CV_4V;
-		on = _PAGE_E_4V;
-	}
-
-	return __pgprot((val & ~off) | on);
-}
-
-pte_t pfn_pte(unsigned long pfn, pgprot_t prot)
-{
-	unsigned long sz_bits = _PAGE_SZBITS_4U;
-
-	if (tlb_type == hypervisor)
-		sz_bits = _PAGE_SZBITS_4V;
-
-	return __pte((pfn << PAGE_SHIFT) | pgprot_val(prot) | sz_bits);
-}
-
-unsigned long pte_pfn(pte_t pte)
-{
-	unsigned long mask = _PAGE_PADDR_4U;
-
-	if (tlb_type == hypervisor)
-		mask = _PAGE_PADDR_4V;
-
-	return (pte_val(pte) & mask) >> PAGE_SHIFT;
-}
-
-pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
-{
-	unsigned long preserve_mask;
-	unsigned long val;
-
-	preserve_mask = (_PAGE_PADDR_4U |
-			 _PAGE_MODIFIED_4U |
-			 _PAGE_ACCESSED_4U |
-			 _PAGE_CP_4U |
-			 _PAGE_CV_4U |
-			 _PAGE_E_4U |
-			 _PAGE_PRESENT_4U |
-			 _PAGE_SZBITS_4U);
-	if (tlb_type == hypervisor)
-		preserve_mask = (_PAGE_PADDR_4V |
-				 _PAGE_MODIFIED_4V |
-				 _PAGE_ACCESSED_4V |
-				 _PAGE_CP_4V |
-				 _PAGE_CV_4V |
-				 _PAGE_E_4V |
-				 _PAGE_PRESENT_4V |
-				 _PAGE_SZBITS_4V);
-
-	val = (pte_val(orig_pte) & preserve_mask);
-
-	return __pte(val | (pgprot_val(new_prot) & ~preserve_mask));
+	return pte;
 }
 
 static unsigned long kern_large_tte(unsigned long paddr)