random: Add and use pr_fmt()

Prefix all printk/pr_<level> messages with "random: " to make the
logging a bit more consistent.

Miscellanea:

o Convert a printks to pr_notice
o Whitespace to align to open parentheses
o Remove embedded "random: " from pr_* as pr_fmt adds it
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Link: https://lore.kernel.org/r/20190607182517.28266-3-tiny.windzz@gmail.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

drivers/char/random.c

@@ -307,6 +307,8 @@
  * Eastlake, Steve Crocker, and Jeff Schiller.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/utsname.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -737,7 +739,7 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
 	}
 
 	if (WARN_ON(entropy_count < 0)) {
-		pr_warn("random: negative entropy/overflow: pool %s count %d\n",
+		pr_warn("negative entropy/overflow: pool %s count %d\n",
 			r->name, entropy_count);
 		entropy_count = 0;
 	} else if (entropy_count > pool_size)
@@ -833,7 +835,7 @@ static void crng_initialize(struct crng_state *crng)
 		invalidate_batched_entropy();
 		numa_crng_init();
 		crng_init = 2;
-		pr_notice("random: crng done (trusting CPU's manufacturer)\n");
+		pr_notice("crng done (trusting CPU's manufacturer)\n");
 	}
 	crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1;
 }
@@ -895,7 +897,7 @@ static int crng_fast_load(const char *cp, size_t len)
 	if (crng_init_cnt >= CRNG_INIT_CNT_THRESH) {
 		invalidate_batched_entropy();
 		crng_init = 1;
-		pr_notice("random: fast init done\n");
+		pr_notice("fast init done\n");
 	}
 	return 1;
 }
@@ -981,16 +983,14 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r)
 		process_random_ready_list();
 		wake_up_interruptible(&crng_init_wait);
 		kill_fasync(&fasync, SIGIO, POLL_IN);
-		pr_notice("random: crng init done\n");
+		pr_notice("crng init done\n");
 		if (unseeded_warning.missed) {
-			pr_notice("random: %d get_random_xx warning(s) missed "
-				  "due to ratelimiting\n",
+			pr_notice("%d get_random_xx warning(s) missed due to ratelimiting\n",
 				  unseeded_warning.missed);
 			unseeded_warning.missed = 0;
 		}
 		if (urandom_warning.missed) {
-			pr_notice("random: %d urandom warning(s) missed "
-				  "due to ratelimiting\n",
+			pr_notice("%d urandom warning(s) missed due to ratelimiting\n",
 				  urandom_warning.missed);
 			urandom_warning.missed = 0;
 		}
@@ -1364,7 +1364,7 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
 		ibytes = 0;
 
 	if (WARN_ON(entropy_count < 0)) {
-		pr_warn("random: negative entropy count: pool %s count %d\n",
+		pr_warn("negative entropy count: pool %s count %d\n",
 			r->name, entropy_count);
 		entropy_count = 0;
 	}
@@ -1848,9 +1848,8 @@ urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 	if (!crng_ready() && maxwarn > 0) {
 		maxwarn--;
 		if (__ratelimit(&urandom_warning))
-			printk(KERN_NOTICE "random: %s: uninitialized "
-			       "urandom read (%zd bytes read)\n",
-			       current->comm, nbytes);
+			pr_notice("%s: uninitialized urandom read (%zd bytes read)\n",
+				  current->comm, nbytes);
 		spin_lock_irqsave(&primary_crng.lock, flags);
 		crng_init_cnt = 0;
 		spin_unlock_irqrestore(&primary_crng.lock, flags);