score: Use generic idle loop

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Link: http://lkml.kernel.org/r/20130321215235.147909863@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/score/Kconfig

@@ -11,6 +11,7 @@ config SCORE
        select ARCH_DISCARD_MEMBLOCK
        select GENERIC_CPU_DEVICES
        select GENERIC_CLOCKEVENTS
+       select GENERIC_IDLE_LOOP
        select HAVE_MOD_ARCH_SPECIFIC
 	select VIRT_TO_BUS
 	select MODULES_USE_ELF_REL

arch/score/kernel/process.c

@@ -41,24 +41,6 @@ void machine_halt(void) {}
 /* If or when software machine-power-off is implemented, add code here. */
 void machine_power_off(void) {}
 
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void __noreturn cpu_idle(void)
-{
-	/* endless idle loop with no priority at all */
-	while (1) {
-		rcu_idle_enter();
-		while (!need_resched())
-			barrier();
-		rcu_idle_exit();
-		schedule_preempt_disabled();
-	}
-}
-
 void ret_from_fork(void);
 void ret_from_kernel_thread(void);