rcu: Eliminate NOCBs CPU-state Kconfig options

[mirror_ubuntu-eoan-kernel.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 3025383ab44326398c03737471078b8092e7487c..dc431c6109f2391b17ad8bf705432eb5b8925d6e 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -709,59 +709,6 @@ config RCU_NOCB_CPU
          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
-       depends on RCU_NOCB_CPU
-       help
-         This option allows no-CBs CPUs (whose RCU callbacks are invoked
-         from kthreads rather than from softirq context) 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"
-       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, whose RCU callbacks will be invoked by per-CPU
-         kthreads whose names begin with "rcuo".  All other CPUs will
-         invoke their own RCU callbacks in softirq context.
-
-         Select this option if you want to choose no-CBs CPUs at
-         boot time, for example, to allow testing of different no-CBs
-         configurations without having to rebuild the kernel each time.
-
-config RCU_NOCB_CPU_ZERO
-       bool "CPU 0 is a build_forced no-CBs 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
-         with "rcuo".  Additional CPUs may be designated as no-CBs
-         CPUs using the rcu_nocbs= boot parameter will be no-CBs CPUs.
-         All other CPUs will invoke their own RCU callbacks in softirq
-         context.
-
-         Select this if CPU 0 needs to be a no-CBs CPU for real-time
-         or energy-efficiency reasons, but the real reason it exists
-         is to ensure that randconfig testing covers mixed systems.
-
-config RCU_NOCB_CPU_ALL
-       bool "All CPUs are build_forced no-CBs CPUs"
-       help
-         This option forces all CPUs to be no-CBs CPUs.  The rcu_nocbs=
-         boot parameter will be ignored.  All CPUs' RCU callbacks will
-         be executed in the context of per-CPU rcuo kthreads created for
-         this purpose.  Assuming that the kthreads whose names start with
-         "rcuo" are bound to "housekeeping" CPUs, this reduces OS jitter
-         on the remaining CPUs, but might decrease memory locality during
-         RCU-callback invocation, thus potentially degrading throughput.
-
-         Select this if all CPUs need to be no-CBs CPUs for real-time
-         or energy-efficiency reasons.
-
-endchoice
-
 endmenu # "RCU Subsystem"
 
 config BUILD_BIN2C