Offload callback processing from all CPUs as long as there is no "rcu_nocbs=" boot parameter. This also means: whether CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y takes effect does not depend on the absence of "nohz_full=". Suggested-by: Frederic Weisbecker <frederic@xxxxxxxxxx> Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx> --- kernel/rcu/Kconfig | 4 ++-- kernel/rcu/tree_nocb.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index d471d22a5e21b43..35b94f5f6767f00 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -270,8 +270,8 @@ config RCU_NOCB_CPU_DEFAULT_ALL default n help Use this option to offload callback processing from all CPUs - by default, in the absence of the rcu_nocbs or nohz_full boot - parameter. This also avoids the need to use any boot parameters + by default, in the absence of the rcu_nocbs boot parameter. + This also avoids the need to use any boot parameters to achieve the effect of offloading all CPUs on boot. Say Y here if you want offload all CPUs by default on boot. diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 8b6dceeabde0b4d..cfbdd78d6c33158 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -1219,7 +1219,7 @@ void __init rcu_init_nohz(void) #endif #if defined(CONFIG_RCU_NOCB_CPU_DEFAULT_ALL) - if (!rcu_state.nocb_is_setup && !cpumask) + if (!rcu_state.nocb_is_setup) cpumask = cpu_possible_mask; #endif -- 2.25.1
