Merge commit '8700c95adb03' into timers/nohz

The full dynticks tree needs the latest RCU and sched
upstream updates in order to fix some dependencies.

Merge a common upstream merge point that has these
updates.

Conflicts:
	include/linux/perf_event.h
	kernel/rcutree.h
	kernel/rcutree_plugin.h

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 58 insertions, 19 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 8f97a7407714..66f67afad4fa 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -28,10 +28,6 @@ config BUILDTIME_EXTABLE_SORT
 
 menu "General setup"
 
-config EXPERIMENTAL
-	bool
-	default y
-
 config BROKEN
 	bool
 
@@ -583,13 +579,16 @@ config RCU_FAST_NO_HZ
 	depends on NO_HZ_COMMON && SMP
 	default n
 	help
-	  This option causes RCU to attempt to accelerate grace periods in
-	  order to allow CPUs to enter dynticks-idle state more quickly.
-	  On the other hand, this option increases the overhead of the
-	  dynticks-idle checking, thus degrading scheduling latency.
+	  This option permits CPUs to enter dynticks-idle state even if
+	  they have RCU callbacks queued, and prevents RCU from waking
+	  these CPUs up more than roughly once every four jiffies (by
+	  default, you can adjust this using the rcutree.rcu_idle_gp_delay
+	  parameter), thus improving energy efficiency.  On the other
+	  hand, this option increases the duration of RCU grace periods,
+	  for example, slowing down synchronize_rcu().
 
-	  Say Y if energy efficiency is critically important, and you don't
-	  	care about real-time response.
+	  Say Y if energy efficiency is critically important, and you
+	  	don't care about increased grace-period durations.
 
 	  Say N if you are unsure.
 
@@ -656,7 +655,7 @@ config RCU_BOOST_DELAY
 	  Accept the default if unsure.
 
 config RCU_NOCB_CPU
-	bool "Offload RCU callback processing from boot-selected CPUs"
+	bool "Offload RCU callback processing from boot-selected CPUs (EXPERIMENTAL"
 	depends on TREE_RCU || TREE_PREEMPT_RCU
 	default n
 	help
@@ -667,16 +666,56 @@ config RCU_NOCB_CPU
 
 	  This option offloads callback invocation from the set of
 	  CPUs specified at boot time by the rcu_nocbs parameter.
-	  For each such CPU, a kthread ("rcuoN") will be created to
-	  invoke callbacks, where the "N" is the CPU being offloaded.
-	  Nothing prevents this kthread from running on the specified
-	  CPUs, but (1) the kthreads may be preempted between each
-	  callback, and (2) affinity or cgroups can be used to force
-	  the kthreads to run on whatever set of CPUs is desired.
-
-	  Say Y here if you want reduced OS jitter on selected CPUs.
+	  For each such CPU, a kthread ("rcuox/N") will be created to
+	  invoke callbacks, where the "N" is the CPU being offloaded,
+	  and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and
+	  "s" for RCU-sched.  Nothing prevents this kthread from running
+	  on the specified CPUs, but (1) the kthreads may be preempted
+	  between each callback, and (2) affinity or cgroups can be used
+	  to force the kthreads to run on whatever set of CPUs is desired.
+
+	  Say Y here if you want to help to debug reduced OS jitter.
 	  Say N here if you are unsure.
 
+choice
+	prompt "Build-forced no-CBs CPUs"
+	default RCU_NOCB_CPU_NONE
+	help
+	  This option allows no-CBs CPUs to be specified at build time.
+	  Additional no-CBs CPUs may be specified by the rcu_nocbs=
+	  boot parameter.
+
+config RCU_NOCB_CPU_NONE
+	bool "No build_forced no-CBs CPUs"
+	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
+	  no-CBs CPUs.
+
+config RCU_NOCB_CPU_ZERO
+	bool "CPU 0 is a build_forced no-CBs CPU"
+	depends on RCU_NOCB_CPU
+	help
+	  This option forces CPU 0 to be a no-CBs CPU.  Additional CPUs
+	  may be designated as no-CBs CPUs using the rcu_nocbs= boot
+	  parameter will be no-CBs CPUs.
+
+	  Select this if CPU 0 needs to be a no-CBs CPU for real-time
+	  or energy-efficiency reasons.
+
+config RCU_NOCB_CPU_ALL
+	bool "All CPUs are build_forced no-CBs CPUs"
+	depends on RCU_NOCB_CPU
+	help
+	  This option forces all CPUs to be no-CBs CPUs.  The rcu_nocbs=
+	  boot parameter will be ignored.
+
+	  Select this if all CPUs need to be no-CBs CPUs for real-time
+	  or energy-efficiency reasons.
+
+endchoice
+
 endmenu # "RCU Subsystem"
 
 config IKCONFIG