ARM: use generic ioremap_page_range()

We don't need our own implementation of this, use the generic
library implementation instead.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/ioremap.c

@@ -42,78 +42,11 @@
  */
 #define VM_ARM_SECTION_MAPPING	0x80000000
 
-static int remap_area_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
-			  unsigned long phys_addr, const struct mem_type *type)
-{
-	pgprot_t prot = __pgprot(type->prot_pte);
-	pte_t *pte;
-
-	pte = pte_alloc_kernel(pmd, addr);
-	if (!pte)
-		return -ENOMEM;
-
-	do {
-		if (!pte_none(*pte))
-			goto bad;
-
-		set_pte_ext(pte, pfn_pte(phys_addr >> PAGE_SHIFT, prot), 0);
-		phys_addr += PAGE_SIZE;
-	} while (pte++, addr += PAGE_SIZE, addr != end);
-	return 0;
-
- bad:
-	printk(KERN_CRIT "remap_area_pte: page already exists\n");
-	BUG();
-}
-
-static inline int remap_area_pmd(pgd_t *pgd, unsigned long addr,
-				 unsigned long end, unsigned long phys_addr,
-				 const struct mem_type *type)
-{
-	unsigned long next;
-	pmd_t *pmd;
-	int ret = 0;
-
-	pmd = pmd_alloc(&init_mm, pgd, addr);
-	if (!pmd)
-		return -ENOMEM;
-
-	do {
-		next = pmd_addr_end(addr, end);
-		ret = remap_area_pte(pmd, addr, next, phys_addr, type);
-		if (ret)
-			return ret;
-		phys_addr += next - addr;
-	} while (pmd++, addr = next, addr != end);
-	return ret;
-}
-
-static int remap_area_pages(unsigned long start, unsigned long pfn,
-			    size_t size, const struct mem_type *type)
-{
-	unsigned long addr = start;
-	unsigned long next, end = start + size;
-	unsigned long phys_addr = __pfn_to_phys(pfn);
-	pgd_t *pgd;
-	int err = 0;
-
-	BUG_ON(addr >= end);
-	pgd = pgd_offset_k(addr);
-	do {
-		next = pgd_addr_end(addr, end);
-		err = remap_area_pmd(pgd, addr, next, phys_addr, type);
-		if (err)
-			break;
-		phys_addr += next - addr;
-	} while (pgd++, addr = next, addr != end);
-
-	return err;
-}
-
 int ioremap_page(unsigned long virt, unsigned long phys,
 		 const struct mem_type *mtype)
 {
-	return remap_area_pages(virt, __phys_to_pfn(phys), PAGE_SIZE, mtype);
+	return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
+				  __pgprot(mtype->prot_pte));
 }
 EXPORT_SYMBOL(ioremap_page);
 
@@ -300,7 +233,8 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
 		err = remap_area_sections(addr, pfn, size, type);
 	} else
 #endif
-		err = remap_area_pages(addr, pfn, size, type);
+		err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
+					 __pgprot(type->prot_pte));
 
 	if (err) {
  		vunmap((void *)addr);