fix UP links - current bk tree

Hi,

UP links are failing with the current bk tree. migration_init is only defined in sched.c when SMP is set so we should not try to call it from main.c.

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher. # This patch includes the following deltas:
# ChangeSet 1.483 -> 1.484
# init/main.c 1.59 -> 1.60
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/08/01 [email protected] 1.484
# Fix so UP links do not ask for migration_init
# --------------------------------------------
#

diff -Nru a/init/main.c b/init/main.c
@@ -526,10 +526,12 @@
 
 static void do_pre_smp_initcalls(void)
 {
-	extern int migration_init(void);
 	extern int spawn_ksoftirqd(void);
+#ifdef CONFIG_SMP
+	extern int migration_init(void);
 
 	migration_init();
+#endif
 	spawn_ksoftirqd();
 }