linux-kernel - Re: [PATCH 0/3] tick: Fix softirq related warnings

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Message-ID: <20220214162920.GX4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 14 Feb 2022 08:29:20 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, christophe.leroy@...roup.eu
Subject: Re: [PATCH 0/3] tick: Fix softirq related warnings

On Mon, Feb 14, 2022 at 06:46:59AM +0100, Paul Menzel wrote:
> Dear Frederic,
> 
> 
> Am 08.02.22 um 17:16 schrieb Frederic Weisbecker:
> > Some cleanups and debug rework.
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> > 	timers/core
> > 
> > HEAD: 18b00369d58da4c73946d5f8ebed8e8c7ade89e2
> > 
> > Thanks,
> > 	Frederic
> > ---
> > 
> > Frederic Weisbecker (3):
> >        tick/rcu: Remove obsolete rcu_needs_cpu() parameters
> >        tick/rcu: Stop allowing RCU_SOFTIRQ in idle
> >        lib/irq_poll: Declare IRQ_POLL softirq vector as ksoftirqd-parking safe
> > 
> > 
> >   include/linux/interrupt.h | 11 ++++++++-
> >   include/linux/rcutiny.h   |  3 +--
> >   include/linux/rcutree.h   |  2 +-
> >   kernel/rcu/tree.c         |  3 +--
> >   kernel/time/tick-sched.c  | 60 ++++++++++++++++++++++++++++++++++-------------
> >   5 files changed, 57 insertions(+), 22 deletions(-)
> 
> I tested this series on the IBM S822LC with Ubuntu 20.10 and rcu/dev (commit
> 0ba8896d2fd7 (lib/irq_poll: Declare IRQ_POLL softirq vector as
> ksoftirqd-parking safe)). Running `sudo ppc64_cpu --smt=off` the warnings
> are gone.
> 
> Tested-by: Paul Menzel <pmenzel@...gen.mpg.de>

I will apply on my next rebase, thank you!

And thanks to Peter and Christophe for chasing this down!

							Thanx, Paul