Re: [patch V3 15/32] s390/kernel: Use stop_machine_cpuslocked()

[Heiko Carstens]

On Wed, May 24, 2017 at 10:15:26AM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: linux-s390@xxxxxxxxxxxxxxx
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> 
> ---
>  arch/s390/kernel/time.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

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