Though mostly identical, ->qsmaskinit(A.K.A rcu_rnp_online_cpus()) is sometimes more sparse than the corresponding part of cpu_possible_mask for an RCU leaf node. So we use for_each_leaf_node_cpu() in rcu_boost_kthread_setaffinity() instead to save some extra checks.
Signed-off-by: Boqun Feng <boqun.f...@gmail.com> --- kernel/rcu/tree_plugin.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 69c6eb27c37f..93cebd940a93 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1175,10 +1175,11 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) return; if (!zalloc_cpumask_var(&cm, GFP_KERNEL)) return; - for_each_leaf_node_possible_cpu(rnp, cpu) - if ((mask & leaf_node_cpu_bit(rnp, cpu)) && - cpu != outgoingcpu) + + for_each_leaf_node_cpu(rnp, mask, cpu) + if (cpu != outgoingcpu) cpumask_set_cpu(cpu, cm); + if (cpumask_weight(cm) == 0) cpumask_setall(cm); set_cpus_allowed_ptr(t, cm); -- 2.10.2