arc: Use generic idle loop

The generic idle loop implements all functionality. Aside of that it
allows arc to implement the tsk_is_polling() functionality correctly,
despite the patently (now gone) comment in the original arc cpu_idle()
function:
/* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
See kernel/cpu/idle.c

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>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20130321215233.711253792@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 3 insertions, 27 deletions

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index e6f4eca09ee3..b006977a1516 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -14,6 +14,7 @@ config ARC
         select GENERIC_ATOMIC64
         select GENERIC_CLOCKEVENTS
         select GENERIC_FIND_FIRST_BIT
+        select GENERIC_IDLE_LOOP
         # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
         select GENERIC_IRQ_SHOW
         select GENERIC_KERNEL_EXECVE
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 0a7531d99294..cad66851e0c4 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -41,37 +41,12 @@ SYSCALL_DEFINE0(arc_gettls)
         return task_thread_info(current)->thr_ptr;
 }
 
-static inline void arch_idle(void)
+void arch_cpu_idle(void)
 {
         /* sleep, but enable all interrupts before committing */
         __asm__("sleep 0x3");
 }
 
-void cpu_idle(void)
-{
-        /* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
-
-        /* endless idle loop with no priority at all */
-        while (1) {
-                tick_nohz_idle_enter();
-                rcu_idle_enter();
-
-doze:
-                local_irq_disable();
-                if (!need_resched()) {
-                        arch_idle();
-                        goto doze;
-                } else {
-                        local_irq_enable();
-                }
-
-                rcu_idle_exit();
-                tick_nohz_idle_exit();
-
-                schedule_preempt_disabled();
-        }
-}
-
 asmlinkage void ret_from_fork(void);
 
 /* Layout of Child kernel mode stack as setup at the end of this function is
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index 3af3e06dcf02..5c7fd603d216 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -141,7 +141,7 @@ void __cpuinit start_kernel_secondary(void)
 
         local_irq_enable();
         preempt_disable();
-        cpu_idle();
+        cpu_startup_entry(CPUHP_ONLINE);
 }
 
 /*