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authorPaul E. McKenney <paulmck@kernel.org>2022-03-17 16:16:45 -0700
committerPaul E. McKenney <paulmck@kernel.org>2022-04-20 16:53:19 -0700
commit4c3f7b0e1e880e892d4bc4f50bf627b251b6e2cc (patch)
tree8816013a3a4b6a2d4c12d922f7b99ef3da2b8516 /kernel
parent3b6e1dd42317ec366dab3205f99280e2ab1ad85a (diff)
rcutorture: Allow rcutorture without RCU Tasks Rude
Unless a kernel builds rcutorture, whether built-in or as a module, that kernel is also built with CONFIG_TASKS_RUDE_RCU, whether anything else needs Tasks Rude RCU or not. This unnecessarily increases kernel size. This commit therefore decouples the presence of rcutorture from the presence of RCU Tasks Rude. However, there is a need to select CONFIG_TASKS_RUDE_RCU for testing purposes. Except that casual users must not be bothered with questions -- for them, this needs to be fully automated. There is thus a CONFIG_FORCE_TASKS_RUDE_RCU that selects CONFIG_TASKS_RUDE_RCU, is user-selectable, but which depends on CONFIG_RCU_EXPERT. [ paulmck: Apply kernel test robot feedback. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcu/Kconfig21
-rw-r--r--kernel/rcu/Kconfig.debug1
-rw-r--r--kernel/rcu/rcutorture.c13
3 files changed, 26 insertions, 9 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index 8eac165db09f..65d45c00fd1b 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -93,15 +93,22 @@ config TASKS_RCU
default n
select IRQ_WORK
+config FORCE_TASKS_RUDE_RCU
+ bool "Force selection of Tasks Rude RCU"
+ depends on RCU_EXPERT
+ select TASKS_RUDE_RCU
+ default n
+ help
+ This option force-enables a task-based RCU implementation
+ that uses only context switch (including preemption) and
+ user-mode execution as quiescent states. It forces IPIs and
+ context switches on all online CPUs, including idle ones,
+ so use with caution. Not for manual selection in most cases.
+
config TASKS_RUDE_RCU
- def_bool 0
+ bool
+ default n
select IRQ_WORK
- help
- This option enables a task-based RCU implementation that uses
- only context switch (including preemption) and user-mode
- execution as quiescent states. It forces IPIs and context
- switches on all online CPUs, including idle ones, so use
- with caution.
config FORCE_TASKS_TRACE_RCU
bool "Force selection of Tasks Trace RCU"
diff --git a/kernel/rcu/Kconfig.debug b/kernel/rcu/Kconfig.debug
index c217a5e655a4..f4a4468cbf03 100644
--- a/kernel/rcu/Kconfig.debug
+++ b/kernel/rcu/Kconfig.debug
@@ -47,7 +47,6 @@ config RCU_TORTURE_TEST
depends on DEBUG_KERNEL
select TORTURE_TEST
select SRCU
- select TASKS_RUDE_RCU
default n
help
This option provides a kernel module that runs torture tests
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 65d045ff9766..d528245108c2 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -833,6 +833,8 @@ static struct rcu_torture_ops tasks_ops = {
#endif // #else #ifdef CONFIG_TASKS_RCU
+#ifdef CONFIG_TASKS_RUDE_RCU
+
/*
* Definitions for rude RCU-tasks torture testing.
*/
@@ -862,6 +864,15 @@ static struct rcu_torture_ops tasks_rude_ops = {
.name = "tasks-rude"
};
+#define TASKS_RUDE_OPS &tasks_rude_ops,
+
+#else // #ifdef CONFIG_TASKS_RUDE_RCU
+
+#define TASKS_RUDE_OPS
+
+#endif // #else #ifdef CONFIG_TASKS_RUDE_RCU
+
+
#ifdef CONFIG_TASKS_TRACE_RCU
/*
@@ -3119,7 +3130,7 @@ rcu_torture_init(void)
unsigned long gp_seq = 0;
static struct rcu_torture_ops *torture_ops[] = {
&rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, &busted_srcud_ops,
- TASKS_OPS &tasks_rude_ops, TASKS_TRACING_OPS
+ TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS
&trivial_ops,
};