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authorZqiang <qiang.zhang1211@gmail.com>2021-11-15 13:15:46 +0800
committerPaul E. McKenney <paulmck@kernel.org>2021-11-30 17:25:20 -0800
commitc2cf0767e98eb4487444e5c7ebba491a866811ce (patch)
treea1e3a20af47a3f8a5cd599c8fa4c4e9babab257c /kernel/rcu/tree_plugin.h
parent17ea3718824912e773b0fd78579694b2e75ee597 (diff)
downloadlinux-c2cf0767e98eb4487444e5c7ebba491a866811ce.tar.bz2
rcu: Avoid running boost kthreads on isolated CPUs
When the boost kthreads are created on systems with nohz_full CPUs, the cpus_allowed_ptr is set to housekeeping_cpumask(HK_FLAG_KTHREAD). However, when the rcu_boost_kthread_setaffinity() is called, the original affinity will be changed and these kthreads can subsequently run on nohz_full CPUs. This commit makes rcu_boost_kthread_setaffinity() restrict these boost kthreads to housekeeping CPUs. Signed-off-by: Zqiang <qiang.zhang1211@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
-rw-r--r--kernel/rcu/tree_plugin.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index f44580276fbd..87fc4609b756 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1203,8 +1203,9 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
if ((mask & leaf_node_cpu_bit(rnp, cpu)) &&
cpu != outgoingcpu)
cpumask_set_cpu(cpu, cm);
+ cpumask_and(cm, cm, housekeeping_cpumask(HK_FLAG_RCU));
if (cpumask_weight(cm) == 0)
- cpumask_setall(cm);
+ cpumask_copy(cm, housekeeping_cpumask(HK_FLAG_RCU));
set_cpus_allowed_ptr(t, cm);
free_cpumask_var(cm);
}