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Commit fa35e42a authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas 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: default avatarCc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
Tested-by: default avatarVineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20130321215233.711253792@linutronix.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent d1669912

arch/arc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arc/kernel/process.c

+1 −26
Original line number Diff line number Diff line
@@ -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

arch/arc/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -141,7 +141,7 @@ void __cpuinit start_kernel_secondary(void) 


	local_irq_enable();

	preempt_disable();

	cpu_idle();

	cpu_startup_entry(CPUHP_ONLINE);

}



/*