From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [tip:x86/apic] x86/acpi: Introduce persistent storage for cpuid
 <-> apicid mapping
Date: Fri, 7 Oct 2016 14:50:07 +0200 (CEST)
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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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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>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, "lenb@kernel.org" <lenb@kernel.org>, "Zheng, Lv" <lv.zheng@intel.com>, robert.moore@intel.com, linux-acpi@vger.kernel.org

On Fri, 7 Oct 2016, Dou Liyang wrote:
> Is it possible that the "-1/oxffffffff" could appear in the MADT which is one
> of the ACPI tables?

According to the SDM the x2apic id is a 32bit ID, so 0xffffffff is a
legitimate value.

Thanks,

	tglx