linux-kernel - Re: [patch 29/34] sh: Use generic idle loop

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Message-ID: <51546466.8000601@linux.vnet.ibm.com>
Date:	Thu, 28 Mar 2013 21:10:22 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [patch 29/34] sh: Use generic idle loop

On 03/22/2013 03:23 AM, Thomas Gleixner wrote:
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> ---
[...]

> -/*
> - * 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 cpu_idle(void)
> +void arch_cpu_idle(void)
>  {
> -	unsigned int cpu = smp_processor_id();
> -
> -	set_thread_flag(TIF_POLLING_NRFLAG);
> -
> -	/* endless idle loop with no priority at all */
> -	while (1) {
> -		tick_nohz_idle_enter();
> -		rcu_idle_enter();
> -
> -		while (!need_resched()) {
> -			check_pgt_cache();
> -			rmb();
> -
> -			if (cpu_is_offline(cpu))
> -				play_dead();
> -
> -			local_irq_disable();
> -			/* Don't trace irqs off for idle */
> -			stop_critical_timings();
> -			if (cpuidle_idle_call())
> -				sh_idle();
> -			/*
> -			 * Sanity check to ensure that sh_idle() returns
> -			 * with IRQs enabled
> -			 */
> -			WARN_ON(irqs_disabled());
> -			start_critical_timings();
> -		}
> -
> -		rcu_idle_exit();
> -		tick_nohz_idle_exit();
> -		schedule_preempt_disabled();
> -	}
> +	if (cpuidle_idle_call())
> +		sh_idle();
>  }
> 

Missing call to play_dead(). Perhaps you can fold the following diff:


diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index 8b9d5d7..2ea4483 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -33,6 +33,11 @@ void default_idle(void)
 	clear_bl_bit();
 }
 
+void arch_cpu_idle_dead(void)
+{
+	play_dead();
+}
+
 void arch_cpu_idle(void)
 {
 	if (cpuidle_idle_call())


Regards,
Srivatsa S. Bhat

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