sched: export cpu_clock()

export cpu_clock() - the preferred API instead of sched_clock().
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

kernel/sched.c

@@ -470,6 +470,7 @@ unsigned long long cpu_clock(int cpu)
 
 	return now;
 }
+EXPORT_SYMBOL_GPL(cpu_clock);
 
 #ifndef prepare_arch_switch
 # define prepare_arch_switch(next)	do { } while (0)