[PATCH tip/core/rcu 1/6] documentation: Fix relation between nohz_full and rcu_nocbs

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

If a CPU is specified in the nohz_full= kernel boot parameter to a
kernel built with CONFIG_NO_HZ_FULL=y, then that CPU's callbacks will
be offloaded, just as if that CPU had also been specified in the
rcu_nocbs= kernel boot parameter.  But the current documentation
states that the user must keep these two boot parameters manually
synchronized.  This commit therefore updates the documentation to
reflect reality.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index d9c171ce4190..3a99cc96b6b1 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2633,9 +2633,10 @@
 			In kernels built with CONFIG_NO_HZ_FULL=y, set
 			the specified list of CPUs whose tick will be stopped
 			whenever possible. The boot CPU will be forced outside
-			the range to maintain the timekeeping.
-			The CPUs in this range must also be included in the
-			rcu_nocbs= set.
+			the range to maintain the timekeeping.  Any CPUs
+			in this list will have their RCU callbacks offloaded,
+			just as if they had also been called out in the
+			rcu_nocbs= boot parameter.
 
 	noiotrap	[SH] Disables trapped I/O port accesses.
 
-- 
2.5.2