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>
