linux-kernel - Re: [patch V3 15/32] s390/kernel: Use stop_machine

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Date:   Wed, 24 May 2017 12:57:14 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org,
        David Hildenbrand <dahi@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch V3 15/32] s390/kernel: Use stop_machine_cpuslocked()

On Wed, May 24, 2017 at 10:15:26AM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> stp_work_fn() holds get_online_cpus() while invoking stop_machine().
> 
> stop_machine() invokes get_online_cpus() as well. This is correct, but
> prevents the conversion of the hotplug locking to a percpu rwsem.
> 
> Use stop_machine_cpuslocked() to avoid the nested call. Convert
> *_online_cpus() to the new interfaces while at it.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: linux-s390@...r.kernel.org
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: David Hildenbrand <dahi@...ux.vnet.ibm.com>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> 
> ---
>  arch/s390/kernel/time.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>