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rcutorture: Allow rcutorture without RCU Tasks Rude

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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>
This commit is contained in:
Paul E. McKenney 2022-03-17 16:16:45 -07:00
parent 3b6e1dd423
commit 4c3f7b0e1e
4 changed files with 29 additions and 10 deletions
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23
kernel/rcu/Kconfig
View File

@ -93,15 +93,22 @@ config TASKS_RCU
default n
select IRQ_WORK
config TASKS_RUDE_RCU
def_bool 0
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 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.
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
bool
default n
select IRQ_WORK
config FORCE_TASKS_TRACE_RCU
bool "Force selection of Tasks Trace RCU"

1
kernel/rcu/Kconfig.debug
View File

@ -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

13
kernel/rcu/rcutorture.c
View File

@ -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,
};

2
tools/testing/selftests/rcutorture/configs/rcu/RUDE01
View File

@ -8,3 +8,5 @@ CONFIG_DEBUG_LOCK_ALLOC=y
CONFIG_PROVE_LOCKING=y
#CHECK#CONFIG_PROVE_RCU=y
CONFIG_RCU_EXPERT=y
CONFIG_FORCE_TASKS_RUDE_RCU=y
#CHECK#CONFIG_TASKS_RUDE_RCU=y