linux-kernel - Re: [tip:x86/apic] x86/acpi: Introduce persistent storage for cpuid <-> apicid mapping

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Date:   Fri, 7 Oct 2016 15:07:32 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dou Liyang <douly.fnst@...fujitsu.com>
cc:     Yinghai Lu <yinghai@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-tip-commits@...r.kernel.org" 
        <linux-tip-commits@...r.kernel.org>,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [tip:x86/apic] x86/acpi: Introduce persistent storage for cpuid
 <-> apicid mapping

On Thu, 6 Oct 2016, Dou Liyang wrote:
> 
> +       if (processor->id >= 255) {
> +               ++disabled_cpus;

Incrementing disabled_cpus here is simply wrong because 0xff is an invalid
local APIC id. So we can simply return -EINVAL and be done with it.

> +               return -EINVAL;

Thanks,

	tglx