Re: [PATCH v3 rcu 08/11] arch/s390: Add ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option

[Heiko Carstens]

On Thu, Oct 20, 2022 at 07:16:44AM +0200, Christian Borntraeger wrote:
> 
> 
> Am 20.10.22 um 00:58 schrieb Paul E. McKenney:
> > The s390 architecture uses either a cmpxchg loop (old systems)
> > or the laa add-to-memory instruction (new systems) to implement
> > this_cpu_add(), both of which are NMI safe.  This means that the old
> > and more-efficient srcu_read_lock() may be used in NMI context, without
> > the need for srcu_read_lock_nmisafe().  Therefore, add the new Kconfig
> > option ARCH_HAS_NMI_SAFE_THIS_CPU_OPS to arch/arm64/Kconfig, which will
> 						s390 ?
> > cause NEED_SRCU_NMI_SAFE to be deselected, thus preserving the current
> > srcu_read_lock() behavior.
> > 
> > Link: https://lore.kernel.org/all/20220910221947.171557773@xxxxxxxxxxxxx/
> > 
> > Suggested-by: Neeraj Upadhyay <quic_neeraju@xxxxxxxxxxx>
> > Suggested-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
> > Suggested-by: Boqun Feng <boqun.feng@xxxxxxxxx>
> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
...
> > ---
> >   arch/s390/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)

Not sure what Christian was trying to say with his empty reply :)
In any case:
Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>