metag: fix put_user sparse errors

virtio wants to write bitwise types to userspace using put_user.
At the moment this triggers sparse errors, since the value is passed
through an integer.

For example:

	__le32 __user *p;
	__le32 x;
	put_user(x, p);

is safe, but currently triggers a sparse warning.

Fix that up using __force.

This also fixes warnings due to writing a pointer out to
userland.

Note: this does not suppress any useful sparse checks since callers
do a cast (__typeof__(*(ptr))) (x) which in turn forces all the
necessary type checks.

Suggested-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: James Hogan <james.hogan@imgtec.com>

arch/metag/include/asm/uaccess.h

@@ -107,18 +107,23 @@ extern long __put_user_asm_w(unsigned int x, void __user *addr);
 extern long __put_user_asm_d(unsigned int x, void __user *addr);
 extern long __put_user_asm_l(unsigned long long x, void __user *addr);
 
-#define __put_user_size(x, ptr, size, retval)			\
-do {                                                            \
-	retval = 0;                                             \
-	switch (size) {                                         \
+#define __put_user_size(x, ptr, size, retval)				\
+do {                                                                    \
+	retval = 0;                                                     \
+	switch (size) {                                                 \
 	case 1:								\
-		retval = __put_user_asm_b((unsigned int)x, ptr); break;	\
+		retval = __put_user_asm_b((__force unsigned int)x, ptr);\
+		break;							\
 	case 2:								\
-		retval = __put_user_asm_w((unsigned int)x, ptr); break;	\
+		retval = __put_user_asm_w((__force unsigned int)x, ptr);\
+		break;							\
 	case 4:								\
-		retval = __put_user_asm_d((unsigned int)x, ptr); break;	\
+		retval = __put_user_asm_d((__force unsigned int)x, ptr);\
+		break;							\
 	case 8:								\
-		retval = __put_user_asm_l((unsigned long long)x, ptr); break; \
+		retval = __put_user_asm_l((__force unsigned long long)x,\
+					  ptr);				\
+		break;							\
 	default:							\
 		__put_user_bad();					\
 	}								\