hexagon: Use generic idle loop

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Rusty Russell <[e-mail]>
Cc: Paul McKenney <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Reviewed-by: Cc: Srivatsa S. Bhat <[e-mail]>
Cc: Magnus Damm <[e-mail]>
Acked-by: Richard Kuo <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Thomas Gleixner <[e-mail]>

arch/hexagon/Kconfig

···
 	select NO_IOPORT
 	select GENERIC_IOMAP
 	select GENERIC_SMP_IDLE_THREAD
+	select GENERIC_IDLE_LOOP
 	select STACKTRACE_SUPPORT
 	select KTIME_SCALAR
 	select GENERIC_CLOCKEVENTS

arch/hexagon/kernel/process.c

···
  *  If hardware or VM offer wait termination even though interrupts
  *  are disabled.
  */
-static void default_idle(void)
+void arch_cpu_idle(void)
 {
 	__vmwait();
-}
-
-void (*idle_sleep)(void) = default_idle;
-
-void cpu_idle(void)
-{
-	while (1) {
-		tick_nohz_idle_enter();
-		local_irq_disable();
-		while (!need_resched()) {
-			idle_sleep();
-			/*  interrupts wake us up, but aren't serviced  */
-			local_irq_enable();	/* service interrupt   */
-			local_irq_disable();
-		}
-		local_irq_enable();
-		tick_nohz_idle_exit();
-		schedule();
-	}
+	/*  interrupts wake us up, but irqs are still disabled */
+	local_irq_enable();
 }
 
 /*

arch/hexagon/kernel/smp.c

···
 
 	local_irq_enable();
 
-	cpu_idle();
+	cpu_startup_entry(CPUHP_ONLINE);
 }