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rcu: Make TINY_RCU depend on !PREEMPT_RCU rather than !PREEMPTION

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Right now, TINY_RCU depends on (!PREEMPTION && !SMP), which has served the
kernel well for many years due to the fact that PREEMPT_RCU is normally
a synonym for PREEMPTION.  But with the advent of lazy preemption,
it will be possible to have non-preemptible RCU in a preemptible kernel,
so that kernels could be built with PREEMPT_RCU=n and PREEMPTION=y.

This commit therefore makes TINY_RCU depend on (!PREEMPT_RCU && !SMP),
thus allowing for a non-preemptible RCU in preemptible kernels.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Ankur Arora <ankur.a.arora@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Paul E. McKenney 2024-02-14 15:33:55 -08:00 committed by Uladzislau Rezki (Sony)
parent 058e87782c
commit c1ec7c1580
1 changed files with 1 additions and 1 deletions
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kernel/rcu/Kconfig
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@ -31,7 +31,7 @@ config PREEMPT_RCU
config TINY_RCU config TINY_RCU
bool bool
default y if !PREEMPTION && !SMP default y if !PREEMPT_RCU && !SMP
help help
This option selects the RCU implementation that is This option selects the RCU implementation that is
designed for UP systems from which real-time response designed for UP systems from which real-time response