linux-kernel - Re: [PATCH RESEND] fix WARNING: at kernel/cpu/idle.c:96

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Date:	Fri, 14 Jun 2013 12:11:31 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Parisc List <linux-parisc@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RESEND] fix WARNING: at kernel/cpu/idle.c:96

On 06/14/2013 11:55 AM, James Bottomley wrote:
>>>From 48bbf44a96676ce6f520a408378730c976e9a11e Mon Sep 17 00:00:00 2001
> From: James Bottomley <JBottomley@...allels.com>
> Date: Wed, 8 May 2013 14:05:34 -0700
> Subject: [PATCH] [PARISC] fix WARNING: at kernel/cpu/idle.c:96
>
> On PA-RISC (and presumably any other arch that doesn't implement its own
> arch_cpu_idle), we get this spurious boot warning.  The problem is that the
> way the idle task is selected initially using the weak arch_cpu_idle() in
> idle.c causes us to enter this place once with interrupts enabled.  Fix this
> by disabling interrupts in the weak arch_cpu_idle() code.

Is this changelog correct?  It looks to me like you are enabling 
interrupts down there.

David Daney


>
> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: James Bottomley <JBottomley@...allels.com>
>
> ---
>
> Thomas, I'm getting a bit impatient: this is a clear bug in the cpu idle
> code and we keep getting reports of this as a boot crash on parisc.  If
> you don't push it through your tree, I'll take it through the parisc
> one.
>
>
> diff --git a/kernel/cpu/idle.c b/kernel/cpu/idle.c
> index d5585f5..0a4d11e 100644
> --- a/kernel/cpu/idle.c
> +++ b/kernel/cpu/idle.c
> @@ -58,6 +58,7 @@ void __weak arch_cpu_idle_dead(void) { }
>   void __weak arch_cpu_idle(void)
>   {
>   	cpu_idle_force_poll = 1;
> +	local_irq_enable();

Here     ^^^^^^^^^^^^^^^^


>   }
>
>   /*
>
>
> --
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