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authorIngo Molnar <mingo@kernel.org>2014-09-23 07:21:42 +0200
committerIngo Molnar <mingo@kernel.org>2014-09-23 07:21:42 +0200
commit62731433591156ece255e23ffd69ea4544b424f1 (patch)
tree125ce584cdb3166456b1767d03c3d5e72ea79a6e /init
parent7c9a3730a5ef4c6240eaaa2d8dcdb8cc1627d715 (diff)
parentdd56af42bd829c6e770ed69812bd65a04eaeb1e4 (diff)
downloadlwn-62731433591156ece255e23ffd69ea4544b424f1.tar.gz
lwn-62731433591156ece255e23ffd69ea4544b424f1.zip
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull the v3.18 RCU changes from Paul E. McKenney: " * Update RCU documentation. These were posted to LKML at https://lkml.org/lkml/2014/8/28/378. * Miscellaneous fixes. These were posted to LKML at https://lkml.org/lkml/2014/8/28/386. An additional fix that eliminates a documented (but now inconvenient) deadlock between RCU hotplug and expedited grace periods was posted at https://lkml.org/lkml/2014/8/28/573. * Changes related to No-CBs CPUs and NO_HZ_FULL. These were posted to LKML at https://lkml.org/lkml/2014/8/28/412. * Torture-test updates. These were posted to LKML at https://lkml.org/lkml/2014/8/28/546 and at https://lkml.org/lkml/2014/9/11/1114. * RCU-tasks implementation. These were posted to LKML at https://lkml.org/lkml/2014/8/28/540. " Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init')
-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 e84c6423a2e5..4fe5500b998f 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 bb1aed928f21..e3c4cdd94d5b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -578,6 +578,7 @@ asmlinkage __visible void __init start_kernel(void)
idr_init_cache();
rcu_init();
tick_nohz_init();
+ rcu_init_nohz();
context_tracking_init();
radix_tree_init();
/* init some links before init_ISA_irqs() */