[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20170524105714.GD5427@osiris>
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>
Powered by blists - more mailing lists