Re: [PATCH] x86, irq, fix logical AND/OR error in check_irq_vectors_for_cpu_disable()

[Chen, Gong]

On Mon, Dec 23, 2013 at 09:39:12AM -0500, Prarit Bhargava wrote:
> diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
> index 7d40698..aed7acc 100644
> --- a/arch/x86/kernel/irq.c
> +++ b/arch/x86/kernel/irq.c
> @@ -281,7 +281,7 @@ int check_irq_vectors_for_cpu_disable(void)
>                       desc = irq_to_desc(irq);
>                       data = irq_desc_get_irq_data(desc);
>                       affinity = data->affinity;
> -                     if (irq_has_action(irq) || !irqd_is_per_cpu(data) ||
> +                     if (irq_has_action(irq) && !irqd_is_per_cpu(data) &&
>                           !cpumask_subset(affinity, cpu_online_mask))
>                               this_count++;
Hi, Prarit

I noticed that you don't mention another question I asked in last mail.

"It looks like cpu_online_mask will be updated until cpu_disable_common
is called, but your check_vectors is called before that."

native_cpu_disable
        cpu_disable_common
                remove_cpu_from_maps
                        /*
                         * until here, cpu_online_mask/cpu_online_bits
                         * is cleared
                         */
                        set_cpu_online(cpu, false);

Something I missed?

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