Date: Fri, 7 Oct 2016 15:07:32 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Dou Liyang <douly.fnst@cn.fujitsu.com>
cc: Yinghai Lu <yinghai@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        "linux-tip-commits@vger.kernel.org" 
        <linux-tip-commits@vger.kernel.org>,
        Tony Luck <tony.luck@intel.com>
Subject: Re: [tip:x86/apic] x86/acpi: Introduce persistent storage for cpuid
 <-> apicid mapping
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References: <1472114120-3281-4-git-send-email-douly.fnst@cn.fujitsu.com> <tip-8f54969dc8d6704632b42cbb5e47730cd75cc713@git.kernel.org> <CAE9FiQVQx6FRXT-RdR7Crz4dg5LeUWHcUSy1KacjR+JgU_vGJg@mail.gmail.com> <alpine.DEB.2.20.1610041258410.7712@nanos>
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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