[PATCH] no need for kernel_flag on UP

This is a minor cleanup.  We currently define and declare the BKL's
kernel_flag spinlock on either SMP or PREEMPT, which means a UP+PREEMPT
machine gets it.

We only need the actual lock on SMP.

kernel/ksyms.c

@@ -483,8 +483,6 @@ EXPORT_SYMBOL(task_nice);
 EXPORT_SYMBOL_GPL(idle_cpu);
 #if CONFIG_SMP
 EXPORT_SYMBOL_GPL(set_cpus_allowed);
-#endif
-#if CONFIG_SMP || CONFIG_PREEMPT
 EXPORT_SYMBOL(kernel_flag);
 #endif
 EXPORT_SYMBOL(jiffies);

kernel/sched.c

@@ -2426,7 +2426,7 @@ __init int migration_init(void)
 
 #endif
 
-#if CONFIG_SMP || CONFIG_PREEMPT
+#if CONFIG_SMP
 /*
  * The 'big kernel lock'
  *