Currently, if a Kconfig option depends on TASKS_RCU, it conditionally does
"select TASKS_RCU if PREEMPTION". This works, but requires any change in
this enablement logic to be replicated across all such "select" clauses.
This commit therefore creates a new NEED_TASKS_RCU Kconfig option so
that the default value of TASKS_RCU can depend on a combination of this
new option and any needed enablement logic, so that this logic is in
one place.
While in the area, also anticipate a likely future change by adding
PREEMPT_AUTO to that logic.
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
Cc: Ankur Arora <ankur.a.ar...@oracle.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Mark Rutland <mark.rutl...@arm.com>
Cc: Steven Rostedt <rost...@goodmis.org>
---
kernel/rcu/Kconfig | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index 7dca0138260c3..3e079de0f5b43 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -85,9 +85,13 @@ config FORCE_TASKS_RCU
idle, and user-mode execution as quiescent states. Not for
manual selection in most cases.
-config TASKS_RCU
+config NEED_TASKS_RCU
bool
default n
+
+config TASKS_RCU
+ bool
+ default NEED_TASKS_RCU && (PREEMPTION || PREEMPT_AUTO)
select IRQ_WORK
config FORCE_TASKS_RUDE_RCU
--
2.40.1
