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rcu: Create NEED_TASKS_RCU to factor out enablement logic

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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 <paulmck@kernel.org>
Cc: Ankur Arora <ankur.a.arora@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Paul E. McKenney 2024-02-22 10:09:19 -08:00 committed by Uladzislau Rezki (Sony)
parent 65b4a59557
commit 1b4e9fdf9e
1 changed files with 5 additions and 1 deletions
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6
kernel/rcu/Kconfig
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@ -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