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rcutorture: Privatize fullstop
This commit introduces the torture_must_stop() function in order to keep use of the fullstop variable local to kernel/torture.c. There is also a torture_must_stop_irq() counterpart for use from RCU callbacks, timeout handlers, and the like. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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@ -41,12 +41,6 @@
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module_param(name, type, 0444); \
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MODULE_PARM_DESC(name, msg);
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/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */
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#define FULLSTOP_DONTSTOP 0 /* Normal operation. */
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#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */
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#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */
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extern int fullstop;
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#define TORTURE_FLAG "-torture:"
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#define TOROUT_STRING(s) \
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pr_alert("%s" TORTURE_FLAG s "\n", torture_type)
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@ -85,5 +79,7 @@ void torture_shutdown_absorb(const char *title);
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void torture_init_begin(char *ttype, bool v);
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void torture_init_end(void);
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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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#endif /* __LINUX_TORTURE_H */
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@ -304,7 +304,7 @@ rcu_torture_cb(struct rcu_head *p)
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int i;
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struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu);
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if (fullstop != FULLSTOP_DONTSTOP) {
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if (torture_must_stop_irq()) {
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/* Test is ending, just drop callbacks on the floor. */
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/* The next initialization will pick up the pieces. */
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return;
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@ -572,8 +572,7 @@ static int rcu_torture_boost(void *arg)
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while (ULONG_CMP_LT(jiffies, oldstarttime)) {
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schedule_timeout_interruptible(oldstarttime - jiffies);
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rcu_stutter_wait("rcu_torture_boost");
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if (kthread_should_stop() ||
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fullstop != FULLSTOP_DONTSTOP)
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if (torture_must_stop())
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goto checkwait;
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}
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@ -595,8 +594,7 @@ static int rcu_torture_boost(void *arg)
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}
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cond_resched();
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rcu_stutter_wait("rcu_torture_boost");
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if (kthread_should_stop() ||
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fullstop != FULLSTOP_DONTSTOP)
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if (torture_must_stop())
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goto checkwait;
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}
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@ -621,7 +619,7 @@ static int rcu_torture_boost(void *arg)
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/* Go do the stutter. */
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checkwait: rcu_stutter_wait("rcu_torture_boost");
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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/* Clean up and exit. */
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VERBOSE_TOROUT_STRING("rcu_torture_boost task stopping");
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@ -659,7 +657,7 @@ rcu_torture_fqs(void *arg)
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fqs_burst_remaining -= fqs_holdoff;
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}
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rcu_stutter_wait("rcu_torture_fqs");
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_fqs task stopping");
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torture_shutdown_absorb("rcu_torture_fqs");
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while (!kthread_should_stop())
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@ -731,7 +729,7 @@ rcu_torture_writer(void *arg)
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}
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rcutorture_record_progress(++rcu_torture_current_version);
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rcu_stutter_wait("rcu_torture_writer");
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_writer task stopping");
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torture_shutdown_absorb("rcu_torture_writer");
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while (!kthread_should_stop())
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@ -768,7 +766,7 @@ rcu_torture_fakewriter(void *arg)
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cur_ops->exp_sync();
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}
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rcu_stutter_wait("rcu_torture_fakewriter");
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task stopping");
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torture_shutdown_absorb("rcu_torture_fakewriter");
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@ -913,7 +911,7 @@ rcu_torture_reader(void *arg)
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cur_ops->readunlock(idx);
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schedule();
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rcu_stutter_wait("rcu_torture_reader");
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_reader task stopping");
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torture_shutdown_absorb("rcu_torture_reader");
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if (irqreader && cur_ops->irq_capable)
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@ -1022,9 +1020,6 @@ rcu_torture_stats_print(void)
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/*
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* Periodically prints torture statistics, if periodic statistics printing
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* was specified via the stat_interval module parameter.
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*
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* No need to worry about fullstop here, since this one doesn't reference
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* volatile state or register callbacks.
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*/
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static int
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rcu_torture_stats(void *arg)
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@ -1034,7 +1029,7 @@ rcu_torture_stats(void *arg)
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schedule_timeout_interruptible(stat_interval * HZ);
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rcu_torture_stats_print();
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torture_shutdown_absorb("rcu_torture_stats");
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} while (!kthread_should_stop());
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_stats task stopping");
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return 0;
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}
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@ -1241,16 +1236,15 @@ static int rcu_torture_barrier_cbs(void *arg)
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wait_event(barrier_cbs_wq[myid],
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(newphase =
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ACCESS_ONCE(barrier_phase)) != lastphase ||
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kthread_should_stop() ||
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fullstop != FULLSTOP_DONTSTOP);
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torture_must_stop());
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lastphase = newphase;
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smp_mb(); /* ensure barrier_phase load before ->call(). */
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if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP)
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if (torture_must_stop())
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break;
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cur_ops->call(&rcu, rcu_torture_barrier_cbf);
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if (atomic_dec_and_test(&barrier_cbs_count))
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wake_up(&barrier_wq);
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task stopping");
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torture_shutdown_absorb("rcu_torture_barrier_cbs");
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while (!kthread_should_stop())
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@ -1275,9 +1269,8 @@ static int rcu_torture_barrier(void *arg)
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wake_up(&barrier_cbs_wq[i]);
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wait_event(barrier_wq,
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atomic_read(&barrier_cbs_count) == 0 ||
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kthread_should_stop() ||
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fullstop != FULLSTOP_DONTSTOP);
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if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP)
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torture_must_stop());
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if (torture_must_stop())
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break;
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n_barrier_attempts++;
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cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */
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@ -1287,7 +1280,7 @@ static int rcu_torture_barrier(void *arg)
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}
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n_barrier_successes++;
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schedule_timeout_interruptible(HZ / 10);
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} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
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} while (!torture_must_stop());
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VERBOSE_TOROUT_STRING("rcu_torture_barrier task stopping");
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torture_shutdown_absorb("rcu_torture_barrier");
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while (!kthread_should_stop())
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@ -1585,7 +1578,6 @@ rcu_torture_init(void)
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else
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nrealreaders = 2 * num_online_cpus();
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rcu_torture_print_module_parms(cur_ops, "Start of test");
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fullstop = FULLSTOP_DONTSTOP;
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/* Set up the freelist. */
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@ -52,8 +52,11 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
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static char *torture_type;
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static bool verbose;
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int fullstop = FULLSTOP_RMMOD;
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EXPORT_SYMBOL_GPL(fullstop);
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/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */
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#define FULLSTOP_DONTSTOP 0 /* Normal operation. */
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#define FULLSTOP_SHUTDOWN 1 /* System shutdown with torture running. */
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#define FULLSTOP_RMMOD 2 /* Normal rmmod of torture. */
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static int fullstop = FULLSTOP_RMMOD;
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static DEFINE_MUTEX(fullstop_mutex);
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#ifdef CONFIG_HOTPLUG_CPU
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@ -458,6 +461,7 @@ void __init torture_init_begin(char *ttype, bool v)
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mutex_lock(&fullstop_mutex);
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torture_type = ttype;
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verbose = v;
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fullstop = FULLSTOP_DONTSTOP;
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}
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EXPORT_SYMBOL_GPL(torture_init_begin);
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@ -498,3 +502,22 @@ bool torture_cleanup(void)
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return false;
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}
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EXPORT_SYMBOL_GPL(torture_cleanup);
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/*
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* Is it time for the current torture test to stop?
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*/
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bool torture_must_stop(void)
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{
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return torture_must_stop_irq() || kthread_should_stop();
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}
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EXPORT_SYMBOL_GPL(torture_must_stop);
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/*
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* Is it time for the current torture test to stop? This is the irq-safe
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* version, hence no check for kthread_should_stop().
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*/
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bool torture_must_stop_irq(void)
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{
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return fullstop != FULLSTOP_DONTSTOP;
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}
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EXPORT_SYMBOL_GPL(torture_must_stop_irq);
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