linux-kernel - Re: [PATCH v2 04/13] tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem

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Message-ID: <ZCCeS/VeGthUNgIY@localhost.localdomain>
Date:   Sun, 26 Mar 2023 21:34:35 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Zhouyi Zhou <zhouzhouyi@...il.com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        rcu <rcu@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2 04/13] tick/nohz: Fix cpu_is_hotpluggable() by
 checking with nohz subsystem

Le Sat, Mar 25, 2023 at 05:33:07PM +0000, Joel Fernandes (Google) a écrit :
> For CONFIG_NO_HZ_FULL systems, the tick_do_timer_cpu cannot be offlined.
> However, cpu_is_hotpluggable() still returns true for those CPUs. This causes
> torture tests that do offlining to end up trying to offline this CPU causing
> test failures. Such failure happens on all architectures.

It might be worth noting that hotplug failure is fine on hotplug testing.
The issue here is the repetitive error message in the logs.

Other than that:

Acked-by: Frederic Weisbecker <frederic@...nel.org>