arc: Use generic idle loop (fa35e42a) · Commits · 戴 / test

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>

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);
		}

		/*

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