diff options
Diffstat (limited to 'kernel/rcu/tree_nocb.h')
| -rw-r--r-- | kernel/rcu/tree_nocb.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 4cf9a29bba79..60cc92cc6655 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -1197,11 +1197,21 @@ void __init rcu_init_nohz(void) { int cpu; bool need_rcu_nocb_mask = false; + bool offload_all = false; struct rcu_data *rdp; +#if defined(CONFIG_RCU_NOCB_CPU_DEFAULT_ALL) + if (!rcu_state.nocb_is_setup) { + need_rcu_nocb_mask = true; + offload_all = true; + } +#endif /* #if defined(CONFIG_RCU_NOCB_CPU_DEFAULT_ALL) */ + #if defined(CONFIG_NO_HZ_FULL) - if (tick_nohz_full_running && !cpumask_empty(tick_nohz_full_mask)) + if (tick_nohz_full_running && !cpumask_empty(tick_nohz_full_mask)) { need_rcu_nocb_mask = true; + offload_all = false; /* NO_HZ_FULL has its own mask. */ + } #endif /* #if defined(CONFIG_NO_HZ_FULL) */ if (need_rcu_nocb_mask) { @@ -1222,6 +1232,9 @@ void __init rcu_init_nohz(void) cpumask_or(rcu_nocb_mask, rcu_nocb_mask, tick_nohz_full_mask); #endif /* #if defined(CONFIG_NO_HZ_FULL) */ + if (offload_all) + cpumask_setall(rcu_nocb_mask); + if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) { pr_info("\tNote: kernel parameter 'rcu_nocbs=', 'nohz_full', or 'isolcpus=' contains nonexistent CPUs.\n"); cpumask_and(rcu_nocb_mask, cpu_possible_mask, |