linux-kernel - Re: [patch 13/34] cris: Use generic idle loop

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Date:	Wed, 27 Mar 2013 16:04:24 +0100
From:	Jesper Nilsson <jesper.nilsson@...s.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>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [patch 13/34] cris: Use generic idle loop


On Thu, Mar 21, 2013 at 09:53:06PM -0000, Thomas Gleixner wrote:
[snip]
> Index: linux-2.6/arch/cris/arch-v32/kernel/process.c
> ===================================================================
> --- linux-2.6.orig/arch/cris/arch-v32/kernel/process.c
> +++ linux-2.6/arch/cris/arch-v32/kernel/process.c
> @@ -23,12 +23,10 @@ extern void stop_watchdog(void);
>  /* We use this if we don't have any better idle routine. */
>  void default_idle(void)
>  {
> -	local_irq_disable();
> -	if (!need_resched()) {
> -		/* Halt until exception. */
> -		__asm__ volatile("ei    \n\t"
> -				 "halt      ");
> -	}
> +	/* Halt until exception. */
> +	__asm__ volatile("ei    \n\t"
> +			 "halt      ");
> +	/* CHECKME: Is this really needed ?? */
>  	local_irq_enable();

No, that local_irq_enable() is redundant since we already enabled interrupts
in the assembler directive above.

>  }

Looks good,

Acked-by: Jesper Nilsson <jesper.nilsson@...s.com>

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com
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