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-rw-r--r--init/Kconfig14
-rw-r--r--init/main.c1
2 files changed, 13 insertions, 2 deletions
diff --git a/init/Kconfig b/init/Kconfig
index d235581..1c505e0 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -507,6 +507,16 @@ config PREEMPT_RCU
This option enables preemptible-RCU code that is common between
TREE_PREEMPT_RCU and, in the old days, TINY_PREEMPT_RCU.
+config TASKS_RCU
+ bool "Task_based RCU implementation using voluntary context switch"
+ default n
+ help
+ This option enables a task-based RCU implementation that uses
+ only voluntary context switch (not preemption!), idle, and
+ user-mode execution as quiescent states.
+
+ If unsure, say N.
+
config RCU_STALL_COMMON
def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE )
help
@@ -737,7 +747,7 @@ choice
config RCU_NOCB_CPU_NONE
bool "No build_forced no-CBs CPUs"
- depends on RCU_NOCB_CPU && !NO_HZ_FULL_ALL
+ depends on RCU_NOCB_CPU
help
This option does not force any of the CPUs to be no-CBs CPUs.
Only CPUs designated by the rcu_nocbs= boot parameter will be
@@ -751,7 +761,7 @@ config RCU_NOCB_CPU_NONE
config RCU_NOCB_CPU_ZERO
bool "CPU 0 is a build_forced no-CBs CPU"
- depends on RCU_NOCB_CPU && !NO_HZ_FULL_ALL
+ depends on RCU_NOCB_CPU
help
This option forces CPU 0 to be a no-CBs CPU, so that its RCU
callbacks are invoked by a per-CPU kthread whose name begins
diff --git a/init/main.c b/init/main.c
index 8af2f1a..c5c11da 100644
--- a/init/main.c
+++ b/init/main.c
@@ -583,6 +583,7 @@ asmlinkage __visible void __init start_kernel(void)
early_irq_init();
init_IRQ();
tick_init();
+ rcu_init_nohz();
init_timers();
hrtimers_init();
softirq_init();
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