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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-02-03 11:52:27 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-02-23 09:03:24 -0800
commit47cf29b9e721967aac95ebda9e50408219755852 (patch)
tree9f35fcc13e7411c277094b9740d94fab14323a8b /kernel/torture.c
parentbc8f83e2c0d585b201dfbb52e98f6f8741d324ea (diff)
rcutorture: Abstract torture_create_kthread()
Creation of kthreads is not RCU-specific, so this commit abstracts out torture_create_kthread(), saving a few tens of lines of code in the process. This change requires modifying VERBOSE_TOROUT_ERRSTRING() to take a non-const string, so that _torture_create_kthread() can avoid an open-coded substitute. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/torture.c')
-rw-r--r--kernel/torture.c80
1 files changed, 33 insertions, 47 deletions
diff --git a/kernel/torture.c b/kernel/torture.c
index 330576660cf4..439451821a7f 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -180,23 +180,16 @@ torture_onoff(void *arg)
*/
int torture_onoff_init(long ooholdoff, long oointerval)
{
-#ifdef CONFIG_HOTPLUG_CPU
- int ret;
+ int ret = 0;
+#ifdef CONFIG_HOTPLUG_CPU
onoff_holdoff = ooholdoff;
onoff_interval = oointerval;
if (onoff_interval <= 0)
return 0;
- VERBOSE_TOROUT_STRING("Creating torture_onoff task");
- onoff_task = kthread_run(torture_onoff, NULL, "torture_onoff");
- if (IS_ERR(onoff_task)) {
- ret = PTR_ERR(onoff_task);
- onoff_task = NULL;
- return ret;
- }
- torture_shuffle_task_register(onoff_task);
+ ret = torture_create_kthread(torture_onoff, NULL, onoff_task);
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
- return 0;
+ return ret;
}
EXPORT_SYMBOL_GPL(torture_onoff_init);
@@ -379,8 +372,6 @@ static int torture_shuffle(void *arg)
*/
int torture_shuffle_init(long shuffint)
{
- int ret;
-
shuffle_interval = shuffint;
shuffle_idle_cpu = -1;
@@ -391,17 +382,7 @@ int torture_shuffle_init(long shuffint)
}
/* Create the shuffler thread */
- VERBOSE_TOROUT_STRING("Creating torture_shuffle task");
- shuffler_task = kthread_run(torture_shuffle, NULL, "torture_shuffle");
- if (IS_ERR(shuffler_task)) {
- ret = PTR_ERR(shuffler_task);
- free_cpumask_var(shuffle_tmp_mask);
- VERBOSE_TOROUT_ERRSTRING("Failed to create shuffler");
- shuffler_task = NULL;
- return ret;
- }
- torture_shuffle_task_register(shuffler_task);
- return 0;
+ return torture_create_kthread(torture_shuffle, NULL, shuffler_task);
}
EXPORT_SYMBOL_GPL(torture_shuffle_init);
@@ -483,25 +464,16 @@ static int torture_shutdown(void *arg)
*/
int torture_shutdown_init(int ssecs, void (*cleanup)(void))
{
- int ret;
+ int ret = 0;
shutdown_secs = ssecs;
torture_shutdown_hook = cleanup;
if (shutdown_secs > 0) {
- VERBOSE_TOROUT_STRING("Creating torture_shutdown task");
shutdown_time = jiffies + shutdown_secs * HZ;
- shutdown_task = kthread_create(torture_shutdown, NULL,
- "torture_shutdown");
- if (IS_ERR(shutdown_task)) {
- ret = PTR_ERR(shutdown_task);
- VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown");
- shutdown_task = NULL;
- return ret;
- }
- torture_shuffle_task_register(shutdown_task);
- wake_up_process(shutdown_task);
+ ret = torture_create_kthread(torture_shutdown, NULL,
+ shutdown_task);
}
- return 0;
+ return ret;
}
EXPORT_SYMBOL_GPL(torture_shutdown_init);
@@ -595,16 +567,8 @@ int torture_stutter_init(int s)
int ret;
stutter = s;
- VERBOSE_TOROUT_STRING("Creating torture_stutter task");
- stutter_task = kthread_run(torture_stutter, NULL, "torture_stutter");
- if (IS_ERR(stutter_task)) {
- ret = PTR_ERR(stutter_task);
- VERBOSE_TOROUT_ERRSTRING("Failed to create stutter");
- stutter_task = NULL;
- return ret;
- }
- torture_shuffle_task_register(stutter_task);
- return 0;
+ ret = torture_create_kthread(torture_stutter, NULL, stutter_task);
+ return ret;
}
EXPORT_SYMBOL_GPL(torture_stutter_init);
@@ -714,3 +678,25 @@ void torture_kthread_stopping(char *title)
}
}
EXPORT_SYMBOL_GPL(torture_kthread_stopping);
+
+/*
+ * Create a generic torture kthread that is immediately runnable. If you
+ * need the kthread to be stopped so that you can do something to it before
+ * it starts, you will need to open-code your own.
+ */
+int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
+ char *f, struct task_struct **tp)
+{
+ int ret = 0;
+
+ VERBOSE_TOROUT_STRING(m);
+ *tp = kthread_run(fn, arg, s);
+ if (IS_ERR(*tp)) {
+ ret = PTR_ERR(*tp);
+ VERBOSE_TOROUT_ERRSTRING(f);
+ *tp = NULL;
+ }
+ torture_shuffle_task_register(*tp);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(_torture_create_kthread);