linux-kernel - Re: ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT

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Date:   Tue, 8 Feb 2022 07:23:28 -0600
From:   "Paul A. Clarke" <pc@...ibm.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org, Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is
 pending, handler #20!!!` when turning off SMT

On Tue, Feb 08, 2022 at 02:17:03PM +0100, Frederic Weisbecker wrote:
> On Tue, Feb 08, 2022 at 08:32:37AM +0100, Paul Menzel wrote:
> > once warned about a NOHZ tick-stop error, when I executed `sudo
> > /usr/sbin/ppc64_cpu --smt=off` (so that KVM would work).
> 
> I see, so I assume this sets some CPUs offline, right?

ppc64_cpu --smt=off sets all but the first CPU per core offline.

PC