mm: don't access vm_flags as 'int'

The type of vma->vm_flags is 'unsigned long'. Neither 'int' nor
'unsigned int'. This patch fixes such misuse.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
[ Changed to use a typedef - we'll extend it to cover more cases
  later, since there has been discussion about making it a 64-bit
  type..                      - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memory.c b/mm/memory.c
index b73f677..fc24f7d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -730,7 +730,7 @@
 	add_taint(TAINT_BAD_PAGE);
 }
 
-static inline int is_cow_mapping(unsigned int flags)
+static inline int is_cow_mapping(vm_flags_t flags)
 {
 	return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
 }