mm: percpu: use pr_fmt to prefix output

Use the normal mechanism to make the logging output consistently
"percpu:" instead of a mix of "PERCPU:" and "percpu:"

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index 0db94b7..d66911f 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -95,7 +95,7 @@
 
 	/* all units must be in a single group */
 	if (ai->nr_groups != 1) {
-		pr_crit("percpu: can't handle more than one groups\n");
+		pr_crit("can't handle more than one group\n");
 		return -EINVAL;
 	}
 
@@ -103,7 +103,7 @@
 	alloc_pages = roundup_pow_of_two(nr_pages);
 
 	if (alloc_pages > nr_pages)
-		pr_warn("percpu: wasting %zu pages per chunk\n",
+		pr_warn("wasting %zu pages per chunk\n",
 			alloc_pages - nr_pages);
 
 	return 0;