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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>
This commit is contained in:
Paul E. McKenney
parent
bc8f83e2c0
commit
47cf29b9e7
@ -47,7 +47,7 @@
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#define VERBOSE_TOROUT_STRING(s) \
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do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0)
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#define VERBOSE_TOROUT_ERRSTRING(s) \
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do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0)
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do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)
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/* Definitions for a non-string torture-test module parameter. */
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#define torture_parm(type, name, init, msg) \
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@ -89,5 +89,11 @@ bool torture_cleanup(void);
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bool torture_must_stop(void);
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bool torture_must_stop_irq(void);
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void torture_kthread_stopping(char *title);
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int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
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char *f, struct task_struct **tp);
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#define torture_create_kthread(n, arg, tp) \
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_torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
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"Failed to create " #n, &(tp))
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#endif /* __LINUX_TORTURE_H */
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@ -1105,19 +1105,9 @@ static int rcu_torture_stall(void *args)
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/* Spawn CPU-stall kthread, if stall_cpu specified. */
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static int __init rcu_torture_stall_init(void)
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{
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int ret;
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if (stall_cpu <= 0)
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return 0;
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VERBOSE_TOROUT_STRING("Creating rcu_torture_stall task");
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stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall");
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if (IS_ERR(stall_task)) {
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ret = PTR_ERR(stall_task);
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stall_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(stall_task);
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return 0;
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return torture_create_kthread(rcu_torture_stall, NULL, stall_task);
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}
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/* Clean up after the CPU-stall kthread, if one was spawned. */
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@ -1226,29 +1216,13 @@ static int rcu_torture_barrier_init(void)
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return -ENOMEM;
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for (i = 0; i < n_barrier_cbs; i++) {
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init_waitqueue_head(&barrier_cbs_wq[i]);
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VERBOSE_TOROUT_STRING("Creating rcu_torture_barrier_cbs task");
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barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs,
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(void *)(long)i,
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"rcu_torture_barrier_cbs");
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if (IS_ERR(barrier_cbs_tasks[i])) {
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ret = PTR_ERR(barrier_cbs_tasks[i]);
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VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier_cbs");
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barrier_cbs_tasks[i] = NULL;
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ret = torture_create_kthread(rcu_torture_barrier_cbs,
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(void *)(long)i,
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barrier_cbs_tasks[i]);
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if (ret)
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return ret;
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}
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torture_shuffle_task_register(barrier_cbs_tasks[i]);
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}
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VERBOSE_TOROUT_STRING("Creating rcu_torture_barrier task");
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barrier_task = kthread_run(rcu_torture_barrier, NULL,
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"rcu_torture_barrier");
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if (IS_ERR(barrier_task)) {
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ret = PTR_ERR(barrier_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier");
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barrier_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(barrier_task);
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return 0;
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return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task);
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}
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/* Clean up after RCU barrier testing. */
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@ -1516,17 +1490,10 @@ rcu_torture_init(void)
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/* Start up the kthreads. */
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VERBOSE_TOROUT_STRING("Creating rcu_torture_writer task");
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writer_task = kthread_create(rcu_torture_writer, NULL,
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"rcu_torture_writer");
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if (IS_ERR(writer_task)) {
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firsterr = PTR_ERR(writer_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create writer");
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writer_task = NULL;
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firsterr = torture_create_kthread(rcu_torture_writer, NULL,
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writer_task);
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if (firsterr)
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goto unwind;
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}
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torture_shuffle_task_register(writer_task);
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wake_up_process(writer_task);
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fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]),
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GFP_KERNEL);
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if (fakewriter_tasks == NULL) {
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@ -1535,16 +1502,10 @@ rcu_torture_init(void)
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goto unwind;
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}
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for (i = 0; i < nfakewriters; i++) {
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VERBOSE_TOROUT_STRING("Creating rcu_torture_fakewriter task");
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fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL,
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"rcu_torture_fakewriter");
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if (IS_ERR(fakewriter_tasks[i])) {
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firsterr = PTR_ERR(fakewriter_tasks[i]);
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VERBOSE_TOROUT_ERRSTRING("Failed to create fakewriter");
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fakewriter_tasks[i] = NULL;
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firsterr = torture_create_kthread(rcu_torture_fakewriter,
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NULL, fakewriter_tasks[i]);
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if (firsterr)
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goto unwind;
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}
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torture_shuffle_task_register(fakewriter_tasks[i]);
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}
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reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]),
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GFP_KERNEL);
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@ -1554,28 +1515,16 @@ rcu_torture_init(void)
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goto unwind;
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}
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for (i = 0; i < nrealreaders; i++) {
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VERBOSE_TOROUT_STRING("Creating rcu_torture_reader task");
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reader_tasks[i] = kthread_run(rcu_torture_reader, NULL,
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"rcu_torture_reader");
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if (IS_ERR(reader_tasks[i])) {
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firsterr = PTR_ERR(reader_tasks[i]);
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VERBOSE_TOROUT_ERRSTRING("Failed to create reader");
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reader_tasks[i] = NULL;
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firsterr = torture_create_kthread(rcu_torture_reader, NULL,
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reader_tasks[i]);
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if (firsterr)
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goto unwind;
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}
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torture_shuffle_task_register(reader_tasks[i]);
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}
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if (stat_interval > 0) {
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VERBOSE_TOROUT_STRING("Creating rcu_torture_stats task");
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stats_task = kthread_run(rcu_torture_stats, NULL,
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"rcu_torture_stats");
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if (IS_ERR(stats_task)) {
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firsterr = PTR_ERR(stats_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create stats");
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stats_task = NULL;
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firsterr = torture_create_kthread(rcu_torture_stats, NULL,
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stats_task);
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if (firsterr)
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goto unwind;
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}
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torture_shuffle_task_register(stats_task);
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}
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if (test_no_idle_hz) {
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firsterr = torture_shuffle_init(shuffle_interval * HZ);
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@ -1593,16 +1542,9 @@ rcu_torture_init(void)
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fqs_duration = 0;
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if (fqs_duration) {
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/* Create the fqs thread */
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VERBOSE_TOROUT_STRING("Creating rcu_torture_fqs task");
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fqs_task = kthread_run(rcu_torture_fqs, NULL,
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"rcu_torture_fqs");
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if (IS_ERR(fqs_task)) {
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firsterr = PTR_ERR(fqs_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create fqs");
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fqs_task = NULL;
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torture_create_kthread(rcu_torture_fqs, NULL, fqs_task);
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if (firsterr)
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goto unwind;
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}
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torture_shuffle_task_register(fqs_task);
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}
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if (test_boost_interval < 1)
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test_boost_interval = 1;
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@ -180,23 +180,16 @@ torture_onoff(void *arg)
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*/
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int torture_onoff_init(long ooholdoff, long oointerval)
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{
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#ifdef CONFIG_HOTPLUG_CPU
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int ret;
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int ret = 0;
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#ifdef CONFIG_HOTPLUG_CPU
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onoff_holdoff = ooholdoff;
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onoff_interval = oointerval;
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if (onoff_interval <= 0)
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return 0;
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VERBOSE_TOROUT_STRING("Creating torture_onoff task");
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onoff_task = kthread_run(torture_onoff, NULL, "torture_onoff");
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if (IS_ERR(onoff_task)) {
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ret = PTR_ERR(onoff_task);
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onoff_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(onoff_task);
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ret = torture_create_kthread(torture_onoff, NULL, onoff_task);
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */
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return 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(torture_onoff_init);
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@ -379,8 +372,6 @@ static int torture_shuffle(void *arg)
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*/
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int torture_shuffle_init(long shuffint)
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{
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int ret;
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shuffle_interval = shuffint;
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shuffle_idle_cpu = -1;
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@ -391,17 +382,7 @@ int torture_shuffle_init(long shuffint)
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}
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/* Create the shuffler thread */
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VERBOSE_TOROUT_STRING("Creating torture_shuffle task");
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shuffler_task = kthread_run(torture_shuffle, NULL, "torture_shuffle");
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if (IS_ERR(shuffler_task)) {
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ret = PTR_ERR(shuffler_task);
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free_cpumask_var(shuffle_tmp_mask);
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VERBOSE_TOROUT_ERRSTRING("Failed to create shuffler");
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shuffler_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(shuffler_task);
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return 0;
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return torture_create_kthread(torture_shuffle, NULL, shuffler_task);
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}
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EXPORT_SYMBOL_GPL(torture_shuffle_init);
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@ -483,25 +464,16 @@ static int torture_shutdown(void *arg)
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*/
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int torture_shutdown_init(int ssecs, void (*cleanup)(void))
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{
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int ret;
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int ret = 0;
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shutdown_secs = ssecs;
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torture_shutdown_hook = cleanup;
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if (shutdown_secs > 0) {
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VERBOSE_TOROUT_STRING("Creating torture_shutdown task");
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shutdown_time = jiffies + shutdown_secs * HZ;
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shutdown_task = kthread_create(torture_shutdown, NULL,
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"torture_shutdown");
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if (IS_ERR(shutdown_task)) {
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ret = PTR_ERR(shutdown_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown");
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shutdown_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(shutdown_task);
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wake_up_process(shutdown_task);
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ret = torture_create_kthread(torture_shutdown, NULL,
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shutdown_task);
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}
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return 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(torture_shutdown_init);
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@ -595,16 +567,8 @@ int torture_stutter_init(int s)
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int ret;
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stutter = s;
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VERBOSE_TOROUT_STRING("Creating torture_stutter task");
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stutter_task = kthread_run(torture_stutter, NULL, "torture_stutter");
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if (IS_ERR(stutter_task)) {
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ret = PTR_ERR(stutter_task);
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VERBOSE_TOROUT_ERRSTRING("Failed to create stutter");
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stutter_task = NULL;
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return ret;
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}
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torture_shuffle_task_register(stutter_task);
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return 0;
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ret = torture_create_kthread(torture_stutter, NULL, stutter_task);
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return ret;
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}
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EXPORT_SYMBOL_GPL(torture_stutter_init);
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@ -714,3 +678,25 @@ void torture_kthread_stopping(char *title)
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}
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}
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EXPORT_SYMBOL_GPL(torture_kthread_stopping);
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/*
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* Create a generic torture kthread that is immediately runnable. If you
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* need the kthread to be stopped so that you can do something to it before
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* it starts, you will need to open-code your own.
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*/
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int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
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char *f, struct task_struct **tp)
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{
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int ret = 0;
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VERBOSE_TOROUT_STRING(m);
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*tp = kthread_run(fn, arg, s);
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if (IS_ERR(*tp)) {
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ret = PTR_ERR(*tp);
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VERBOSE_TOROUT_ERRSTRING(f);
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*tp = NULL;
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}
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torture_shuffle_task_register(*tp);
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return ret;
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}
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EXPORT_SYMBOL_GPL(_torture_create_kthread);
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