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rcu: fix rcutorture bug 

Fix an rcutorture bug that prevents the shutdown notifier from ever
actually having any effect, due to the fact that kthreads ignore all
signals.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2009-01-04 18:28:27 -08:00 committed by Ingo Molnar
parent ea7d3fef42
commit c59ab97e9e
1 changed files with 8 additions and 10 deletions
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18
kernel/rcutorture.c
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@ -136,7 +136,7 @@ static int stutter_pause_test = 0;
#endif
int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT;
#define FULLSTOP_SIGNALED 1 /* Bail due to signal. */
#define FULLSTOP_SHUTDOWN 1 /* Bail due to system shutdown/panic. */
#define FULLSTOP_CLEANUP 2 /* Orderly shutdown. */
static int fullstop; /* stop generating callbacks at test end. */
DEFINE_MUTEX(fullstop_mutex); /* protect fullstop transitions and */
@ -151,12 +151,10 @@ rcutorture_shutdown_notify(struct notifier_block *unused1,
{
if (fullstop)
return NOTIFY_DONE;
if (signal_pending(current)) {
mutex_lock(&fullstop_mutex);
if (!ACCESS_ONCE(fullstop))
fullstop = FULLSTOP_SIGNALED;
mutex_unlock(&fullstop_mutex);
}
mutex_lock(&fullstop_mutex);
if (!fullstop)
fullstop = FULLSTOP_SHUTDOWN;
mutex_unlock(&fullstop_mutex);
return NOTIFY_DONE;
}
@ -624,7 +622,7 @@ rcu_torture_writer(void *arg)
rcu_stutter_wait();
} while (!kthread_should_stop() && !fullstop);
VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping");
while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
schedule_timeout_uninterruptible(1);
return 0;
}
@ -649,7 +647,7 @@ rcu_torture_fakewriter(void *arg)
} while (!kthread_should_stop() && !fullstop);
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping");
while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
schedule_timeout_uninterruptible(1);
return 0;
}
@ -759,7 +757,7 @@ rcu_torture_reader(void *arg)
VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping");
if (irqreader && cur_ops->irqcapable)
del_timer_sync(&t);
while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
schedule_timeout_uninterruptible(1);
return 0;
}