linux-kernel - Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages

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Message-ID: <20161007132634.GA20654@x4>
Date:   Fri, 7 Oct 2016 15:26:34 +0200
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:     Gu Zheng <guz.fnst@...fujitsu.com>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Dou Liyang <douly.fnst@...fujitsu.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages

On 2016.10.06 at 13:52 +0200, Markus Trippelsdorf wrote:
> On 2016.10.06 at 12:48 +0100, One Thousand Gnomes wrote:
> > On Thu, 6 Oct 2016 13:27:37 +0200
> > Markus Trippelsdorf <markus@...ppelsdorf.de> wrote:
> > 
> > > On current trunk I get during boot:
> > > 
> > > [    0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached.  Processor 4/0x84 ignored.
> > > [    0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached.  Processor 5/0x85 ignored.
> > > 
> > > I don't think these messages make much sense on a 4-core machine.
> > > 
> > 
> > Four cores with or without hyperthreading ?
> 
> Without. This is a rather old AMD machine (AMD Phenom II X4 955).

CCing more people.

-- 
Markus