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rcutorture: Abstract torture_create_kthread()

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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>
This commit is contained in:
Paul E. McKenney
2014-02-03 11:52:27 -08:00
parent bc8f83e2c0
commit 47cf29b9e7
3 changed files with 60 additions and 126 deletions
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80
kernel/torture.c
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@@ -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);