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Date: Mon, 17 Feb 2014 14:12:42 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
oleg@...hat.com, sbw@....edu,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 38/55] rcutorture: Abstract torture_stop_kthread()
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Stopping of kthreads is not RCU-specific, so this commit abstracts
out torture_stop_kthread(), saving a few lines of code in the process.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
include/linux/torture.h | 3 +++
kernel/rcu/rcutorture.c | 72 ++++++++++---------------------------------------
kernel/torture.c | 13 +++++++++
3 files changed, 30 insertions(+), 58 deletions(-)
diff --git a/include/linux/torture.h b/include/linux/torture.h
index e5264c6ecfeb..db88e7c6ff5d 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -91,9 +91,12 @@ bool torture_must_stop_irq(void);
void torture_kthread_stopping(char *title);
int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
char *f, struct task_struct **tp);
+void _torture_stop_kthread(char *m, struct task_struct **tp);
#define torture_create_kthread(n, arg, tp) \
_torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
"Failed to create " #n, &(tp))
+#define torture_stop_kthread(n, tp) \
+ _torture_stop_kthread("Stopping " #n " task", &(tp))
#endif /* __LINUX_TORTURE_H */
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 951a5559d9fa..fc88144fd9e5 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1032,14 +1032,12 @@ static void rcutorture_booster_cleanup(int cpu)
if (boost_tasks[cpu] == NULL)
return;
mutex_lock(&boost_mutex);
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_boost task");
t = boost_tasks[cpu];
boost_tasks[cpu] = NULL;
mutex_unlock(&boost_mutex);
/* This must be outside of the mutex, otherwise deadlock! */
- kthread_stop(t);
- boost_tasks[cpu] = NULL;
+ torture_stop_kthread(rcu_torture_boost, t);
}
static int rcutorture_booster_init(int cpu)
@@ -1109,16 +1107,6 @@ static int __init rcu_torture_stall_init(void)
return torture_create_kthread(rcu_torture_stall, NULL, stall_task);
}
-/* Clean up after the CPU-stall kthread, if one was spawned. */
-static void rcu_torture_stall_cleanup(void)
-{
- if (stall_task == NULL)
- return;
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_stall_task.");
- kthread_stop(stall_task);
- stall_task = NULL;
-}
-
/* Callback function for RCU barrier testing. */
void rcu_torture_barrier_cbf(struct rcu_head *rcu)
{
@@ -1229,19 +1217,11 @@ static void rcu_torture_barrier_cleanup(void)
{
int i;
- if (barrier_task != NULL) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier task");
- kthread_stop(barrier_task);
- barrier_task = NULL;
- }
+ torture_stop_kthread(rcu_torture_barrier, barrier_task);
if (barrier_cbs_tasks != NULL) {
- for (i = 0; i < n_barrier_cbs; i++) {
- if (barrier_cbs_tasks[i] != NULL) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier_cbs task");
- kthread_stop(barrier_cbs_tasks[i]);
- barrier_cbs_tasks[i] = NULL;
- }
- }
+ for (i = 0; i < n_barrier_cbs; i++)
+ torture_stop_kthread(rcu_torture_barrier_cbs,
+ barrier_cbs_tasks[i]);
kfree(barrier_cbs_tasks);
barrier_cbs_tasks = NULL;
}
@@ -1287,53 +1267,29 @@ rcu_torture_cleanup(void)
}
rcu_torture_barrier_cleanup();
- rcu_torture_stall_cleanup();
+ torture_stop_kthread(rcu_torture_stall, stall_task);
torture_stutter_cleanup();
-
- if (writer_task) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_writer task");
- kthread_stop(writer_task);
- }
- writer_task = NULL;
+ torture_stop_kthread(rcu_torture_writer, writer_task);
if (reader_tasks) {
- for (i = 0; i < nrealreaders; i++) {
- if (reader_tasks[i]) {
- VERBOSE_TOROUT_STRING(
- "Stopping rcu_torture_reader task");
- kthread_stop(reader_tasks[i]);
- }
- reader_tasks[i] = NULL;
- }
+ for (i = 0; i < nrealreaders; i++)
+ torture_stop_kthread(rcu_torture_reader,
+ reader_tasks[i]);
kfree(reader_tasks);
- reader_tasks = NULL;
}
rcu_torture_current = NULL;
if (fakewriter_tasks) {
for (i = 0; i < nfakewriters; i++) {
- if (fakewriter_tasks[i]) {
- VERBOSE_TOROUT_STRING(
- "Stopping rcu_torture_fakewriter task");
- kthread_stop(fakewriter_tasks[i]);
- }
- fakewriter_tasks[i] = NULL;
+ torture_stop_kthread(rcu_torture_fakewriter,
+ fakewriter_tasks[i]);
}
kfree(fakewriter_tasks);
fakewriter_tasks = NULL;
}
- if (stats_task) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_stats task");
- kthread_stop(stats_task);
- }
- stats_task = NULL;
-
- if (fqs_task) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_fqs task");
- kthread_stop(fqs_task);
- }
- fqs_task = NULL;
+ torture_stop_kthread(rcu_torture_stats, stats_task);
+ torture_stop_kthread(rcu_torture_fqs, fqs_task);
if ((test_boost == 1 && cur_ops->can_boost) ||
test_boost == 2) {
unregister_cpu_notifier(&rcutorture_cpu_nb);
diff --git a/kernel/torture.c b/kernel/torture.c
index 94760f0f2923..c0df3b66d084 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -700,3 +700,16 @@ int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
return ret;
}
EXPORT_SYMBOL_GPL(_torture_create_kthread);
+
+/*
+ * Stop a generic kthread, emitting a message.
+ */
+void _torture_stop_kthread(char *m, struct task_struct **tp)
+{
+ if (*tp == NULL)
+ return;
+ VERBOSE_TOROUT_STRING(m);
+ kthread_stop(*tp);
+ *tp = NULL;
+}
+EXPORT_SYMBOL_GPL(_torture_stop_kthread);
--
1.8.1.5
--
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