diff --git a/mm/nommu.c b/mm/nommu.c
index ab14a20..1e0f168 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1497,7 +1497,7 @@
 
 	if (copy_from_user(&a, arg, sizeof(a)))
 		return -EFAULT;
-	if (a.offset & ~PAGE_MASK)
+	if (offset_in_page(a.offset))
 		return -EINVAL;
 
 	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
@@ -1653,9 +1653,9 @@
 			goto erase_whole_vma;
 		if (start < vma->vm_start || end > vma->vm_end)
 			return -EINVAL;
-		if (start & ~PAGE_MASK)
+		if (offset_in_page(start))
 			return -EINVAL;
-		if (end != vma->vm_end && end & ~PAGE_MASK)
+		if (end != vma->vm_end && offset_in_page(end))
 			return -EINVAL;
 		if (start != vma->vm_start && end != vma->vm_end) {
 			ret = split_vma(mm, vma, start, 1);
@@ -1736,7 +1736,7 @@
 	if (old_len == 0 || new_len == 0)
 		return (unsigned long) -EINVAL;
 
-	if (addr & ~PAGE_MASK)
+	if (offset_in_page(addr))
 		return -EINVAL;
 
 	if (flags & MREMAP_FIXED && new_addr != addr)