WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/mm/swap.c b/mm/swap.c
index 2e0e871..d9a3770 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -216,7 +216,7 @@
 }
 
 #ifdef CONFIG_NUMA
-static void lru_add_drain_per_cpu(void *dummy)
+static void lru_add_drain_per_cpu(struct work_struct *dummy)
 {
 	lru_add_drain();
 }
@@ -226,7 +226,7 @@
  */
 int lru_add_drain_all(void)
 {
-	return schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
+	return schedule_on_each_cpu(lru_add_drain_per_cpu);
 }
 
 #else