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

From: Thomas Gleixner
Date: Fri Jun 14 2013 - 16:39:54 EST

On Fri, 14 Jun 2013, James Bottomley wrote:

> >From 48bbf44a96676ce6f520a408378730c976e9a11e Mon Sep 17 00:00:00 2001
> From: James Bottomley <JBottomley@xxxxxxxxxxxxx>
> 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.
> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

What's the stable tag for? This code got merged in 3,10, so stable is
totally irrelevant.

> Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
> ---
> 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.

Hold your breath. I was not even CC'ed on the original patch and I
admit that I ignored the patch which starts with [PARISC].

If the subject line would have started with [idle], [core/idle] I
definitely would have paid attention.

Aside of that the rest of the subject line is just annoyingly
sloppy. We do not fix a WARNING. That's not what this patch is
about. The patch fixes a problem which got introduced with the idle
rework, period.

I'll pick it up and fix the changelog.



> 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();
> }
> /*
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at