uuid: use prandom_bytes()

Use prandom_bytes() to generate 16 bytes of pseudo-random bytes.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/uuid.c

@@ -25,13 +25,7 @@
 
 static void __uuid_gen_common(__u8 b[16])
 {
-	int i;
-	u32 r;
-
-	for (i = 0; i < 4; i++) {
-		r = random32();
-		memcpy(b + i * 4, &r, 4);
-	}
+	prandom_bytes(b, 16);
 	/* reversion 0b10 */
 	b[8] = (b[8] & 0x3F) | 0x80;
 }