doc: Remove obsolete rcutree.rcu_idle_lazy_gp_delay boot parameter

This commit removes documentation for the rcutree.rcu_idle_lazy_gp_delay
kernel boot parameter given that this parameter no longer exists.

Fixes: 77a40f97030b ("rcu: Remove kfree_rcu() special casing and lazy-callback handling")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index c722ec19cd00485ceb9ba4dfce2cf9c5d2deb1d0..b5baa8a54df09414da05569d9d4e4ba50c12f23c 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4179,12 +4179,6 @@
                        Set wakeup interval for idle CPUs that have
                        RCU callbacks (RCU_FAST_NO_HZ=y).
 
-       rcutree.rcu_idle_lazy_gp_delay= [KNL]
-                       Set wakeup interval for idle CPUs that have
-                       only "lazy" RCU callbacks (RCU_FAST_NO_HZ=y).
-                       Lazy RCU callbacks are those which RCU can
-                       prove do nothing more than free memory.
-
        rcutree.rcu_kick_kthreads= [KNL]
                        Cause the grace-period kthread to get an extra
                        wake_up() if it sleeps three times longer than