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Subject[patch 2/8] rcu: Use CONFIG_PREEMPTION
CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in RCU to use CONFIG_PREEMPTION.

That's the first step towards RCU on RT. The further tweaks are work in
progress. This neither touches the selftest bits which need a closer look
by Paul.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
---
arch/Kconfig | 2 +-
include/linux/rcupdate.h | 2 +-
include/linux/rcutree.h | 2 +-
include/linux/torture.h | 2 +-
kernel/rcu/Kconfig | 8 ++++----
kernel/rcu/tree.c | 6 +++---
kernel/rcu/tree_stall.h | 6 +++---
kernel/trace/Kconfig | 2 +-
8 files changed, 15 insertions(+), 15 deletions(-)

--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -103,7 +103,7 @@ config STATIC_KEYS_SELFTEST
config OPTPROBES
def_bool y
depends on KPROBES && HAVE_OPTPROBES
- select TASKS_RCU if PREEMPT
+ select TASKS_RCU if PREEMPTION

config KPROBES_ON_FTRACE
def_bool y
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -578,7 +578,7 @@ do { \
*
* In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
* it is illegal to block while in an RCU read-side critical section.
- * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPT
+ * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPTION
* kernel builds, RCU read-side critical sections may be preempted,
* but explicit blocking is illegal. Finally, in preemptible RCU
* implementations in real-time (with -rt patchset) kernel builds, RCU
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -53,7 +53,7 @@ void rcu_scheduler_starting(void);
extern int rcu_scheduler_active __read_mostly;
void rcu_end_inkernel_boot(void);
bool rcu_is_watching(void);
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
void rcu_all_qs(void);
#endif

--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -86,7 +86,7 @@ void _torture_stop_kthread(char *m, stru
#define torture_stop_kthread(n, tp) \
_torture_stop_kthread("Stopping " #n " task", &(tp))

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
#define torture_preempt_schedule() preempt_schedule()
#else
#define torture_preempt_schedule()
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -7,7 +7,7 @@ menu "RCU Subsystem"

config TREE_RCU
bool
- default y if !PREEMPT && SMP
+ default y if !PREEMPTION && SMP
help
This option selects the RCU implementation that is
designed for very large SMP system with hundreds or
@@ -16,7 +16,7 @@ config TREE_RCU

config PREEMPT_RCU
bool
- default y if PREEMPT
+ default y if PREEMPTION
help
This option selects the RCU implementation that is
designed for very large SMP systems with hundreds or
@@ -28,7 +28,7 @@ config PREEMPT_RCU

config TINY_RCU
bool
- default y if !PREEMPT && !SMP
+ default y if !PREEMPTION && !SMP
help
This option selects the RCU implementation that is
designed for UP systems from which real-time response
@@ -70,7 +70,7 @@ config TREE_SRCU
This option selects the full-fledged version of SRCU.

config TASKS_RCU
- def_bool PREEMPT
+ def_bool PREEMPTION
select SRCU
help
This option enables a task-based RCU implementation that uses
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1881,7 +1881,7 @@ rcu_report_unblock_qs_rnp(struct rcu_nod
struct rcu_node *rnp_p;

raw_lockdep_assert_held_rcu_node(rnp);
- if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT)) ||
+ if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPTION)) ||
WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)) ||
rnp->qsmask != 0) {
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
@@ -2205,7 +2205,7 @@ static void force_qs_rnp(int (*f)(struct
mask = 0;
raw_spin_lock_irqsave_rcu_node(rnp, flags);
if (rnp->qsmask == 0) {
- if (!IS_ENABLED(CONFIG_PREEMPT) ||
+ if (!IS_ENABLED(CONFIG_PREEMPTION) ||
rcu_preempt_blocked_readers_cgp(rnp)) {
/*
* No point in scanning bits because they
@@ -2622,7 +2622,7 @@ static int rcu_blocking_is_gp(void)
{
int ret;

- if (IS_ENABLED(CONFIG_PREEMPT))
+ if (IS_ENABLED(CONFIG_PREEMPTION))
return rcu_scheduler_active == RCU_SCHEDULER_INACTIVE;
might_sleep(); /* Check for RCU read-side critical section. */
preempt_disable();
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -163,7 +163,7 @@ static void rcu_iw_handler(struct irq_wo
//
// Printing RCU CPU stall warnings

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION

/*
* Dump detailed information for all tasks blocking the current RCU
@@ -215,7 +215,7 @@ static int rcu_print_task_stall(struct r
return ndetected;
}

-#else /* #ifdef CONFIG_PREEMPT */
+#else /* #ifdef CONFIG_PREEMPTION */

/*
* Because preemptible RCU does not exist, we never have to check for
@@ -233,7 +233,7 @@ static int rcu_print_task_stall(struct r
{
return 0;
}
-#endif /* #else #ifdef CONFIG_PREEMPT */
+#endif /* #else #ifdef CONFIG_PREEMPTION */

/*
* Dump stacks of all tasks running on stalled CPUs. First try using
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -146,7 +146,7 @@ config FUNCTION_TRACER
select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
select GLOB
- select TASKS_RCU if PREEMPT
+ select TASKS_RCU if PREEMPTION
help
Enable the kernel to trace every kernel function. This is done
by using a compiler feature to insert a small, 5-byte No-Operation

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