diff --git a/mm/mmap.c b/mm/mmap.c
index 4275e81..7a30c49 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1048,8 +1048,7 @@
 
 	/* The open routine did something to the protections already? */
 	if (pgprot_val(vma->vm_page_prot) !=
-	    pgprot_val(protection_map[vm_flags &
-		    (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]))
+	    pgprot_val(vm_get_page_prot(vm_flags)))
 		return 0;
 
 	/* Specialty mapping? */
@@ -1130,8 +1129,7 @@
 	vma->vm_start = addr;
 	vma->vm_end = addr + len;
 	vma->vm_flags = vm_flags;
-	vma->vm_page_prot = protection_map[vm_flags &
-				(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+	vma->vm_page_prot = vm_get_page_prot(vm_flags);
 	vma->vm_pgoff = pgoff;
 
 	if (file) {
@@ -2002,8 +2000,7 @@
 	vma->vm_end = addr + len;
 	vma->vm_pgoff = pgoff;
 	vma->vm_flags = flags;
-	vma->vm_page_prot = protection_map[flags &
-				(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+	vma->vm_page_prot = vm_get_page_prot(flags);
 	vma_link(mm, vma, prev, rb_link, rb_parent);
 out:
 	mm->total_vm += len >> PAGE_SHIFT;
@@ -2209,7 +2206,7 @@
 	vma->vm_end = addr + len;
 
 	vma->vm_flags = vm_flags | mm->def_flags;
-	vma->vm_page_prot = protection_map[vma->vm_flags & 7];
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 
 	vma->vm_ops = &special_mapping_vmops;
 	vma->vm_private_data = pages;