Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU updates from Ingo Molnar:
 "The sole purpose of these changes is to shrink and simplify the RCU
  code base, which has suffered from creeping bloat over the past couple
  of years. The end result is a net removal of ~2700 lines of code:

     79 files changed, 1496 insertions(+), 4211 deletions(-)

  Plus there's a marked reduction in the Kconfig space complexity as
  well, here's the number of matches on 'grep RCU' in the .config:

                               before       after

     x86-defconfig                 17          15
     x86-allmodconfig              33          20"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (86 commits)
  rcu: Remove RCU CPU stall warnings from Tiny RCU
  rcu: Remove event tracing from Tiny RCU
  rcu: Move RCU debug Kconfig options to kernel/rcu
  rcu: Move RCU non-debug Kconfig options to kernel/rcu
  rcu: Eliminate NOCBs CPU-state Kconfig options
  rcu: Remove debugfs tracing
  srcu: Remove Classic SRCU
  srcu: Fix rcutorture-statistics typo
  rcu: Remove SPARSE_RCU_POINTER Kconfig option
  rcu: Remove the now-obsolete PROVE_RCU_REPEATEDLY Kconfig option
  rcu: Remove typecheck() from RCU locking wrapper functions
  rcu: Remove #ifdef moving rcu_end_inkernel_boot from rcupdate.h
  rcu: Remove nohz_full full-system-idle state machine
  rcu: Remove the RCU_KTHREAD_PRIO Kconfig option
  rcu: Remove *_SLOW_* Kconfig options
  srcu: Use rnp->lock wrappers to replace explicit memory barriers
  rcu: Move rnp->lock wrappers for SRCU use
  rcu: Convert rnp->lock wrappers to macros for SRCU use
  rcu: Refactor #includes from include/linux/rcupdate.h
  bcm47xx: Fix build regression
  ...

1 files changed, 3 insertions, 26 deletions

diff --git a/Documentation/timers/NO_HZ.txt b/Documentation/timers/NO_HZ.txt
index 6eaf576294f3..2dcaf9adb7a7 100644
--- a/Documentation/timers/NO_HZ.txt
+++ b/Documentation/timers/NO_HZ.txt
@@ -194,32 +194,9 @@ that the RCU callbacks are processed in a timely fashion.
 
 Another approach is to offload RCU callback processing to "rcuo" kthreads
 using the CONFIG_RCU_NOCB_CPU=y Kconfig option.  The specific CPUs to
-offload may be selected via several methods:
-
-1.	One of three mutually exclusive Kconfig options specify a
-	build-time default for the CPUs to offload:
-
-	a.	The CONFIG_RCU_NOCB_CPU_NONE=y Kconfig option results in
-		no CPUs being offloaded.
-
-	b.	The CONFIG_RCU_NOCB_CPU_ZERO=y Kconfig option causes
-		CPU 0 to be offloaded.
-
-	c.	The CONFIG_RCU_NOCB_CPU_ALL=y Kconfig option causes all
-		CPUs to be offloaded.  Note that the callbacks will be
-		offloaded to "rcuo" kthreads, and that those kthreads
-		will in fact run on some CPU.  However, this approach
-		gives fine-grained control on exactly which CPUs the
-		callbacks run on, along with their scheduling priority
-		(including the default of SCHED_OTHER), and it further
-		allows this control to be varied dynamically at runtime.
-
-2.	The "rcu_nocbs=" kernel boot parameter, which takes a comma-separated
-	list of CPUs and CPU ranges, for example, "1,3-5" selects CPUs 1,
-	3, 4, and 5.  The specified CPUs will be offloaded in addition to
-	any CPUs specified as offloaded by CONFIG_RCU_NOCB_CPU_ZERO=y or
-	CONFIG_RCU_NOCB_CPU_ALL=y.  This means that the "rcu_nocbs=" boot
-	parameter has no effect for kernels built with RCU_NOCB_CPU_ALL=y.
+offload may be selected using The "rcu_nocbs=" kernel boot parameter,
+which takes a comma-separated list of CPUs and CPU ranges, for example,
+"1,3-5" selects CPUs 1, 3, 4, and 5.
 
 The offloaded CPUs will never queue RCU callbacks, and therefore RCU
 never prevents offloaded CPUs from entering either dyntick-idle mode