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rcutorture: Abstract torture_shutdown_notify()

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Because handling the race between rmmod and system shutdown is not
specific to RCU, this commit abstracts torture_shutdown_notify(),
placing this code into kernel/torture.c.  This change also allows
fullstop_mutex to be private to kernel/torture.c.

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 2014-01-30 15:37:19 -08:00
parent 3c626237eb
commit 4622b487ec
3 changed files with 24 additions and 30 deletions
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2
include/linux/torture.h
View File

@ -46,8 +46,6 @@
#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */
#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */
extern int fullstop;
/* Protect fullstop transitions and spawning of kthreads. */
extern struct mutex fullstop_mutex;
#define TORTURE_FLAG "-torture:"
#define TOROUT_STRING(s) \

23
kernel/rcu/rcutorture.c
View File

@ -189,23 +189,6 @@ static DECLARE_WAIT_QUEUE_HEAD(barrier_wq);
/* Forward reference. */
static void rcu_torture_cleanup(void);
/*
* Detect and respond to a system shutdown.
*/
static int
rcutorture_shutdown_notify(struct notifier_block *unused1,
unsigned long unused2, void *unused3)
{
mutex_lock(&fullstop_mutex);
if (fullstop == FULLSTOP_DONTSTOP)
fullstop = FULLSTOP_SHUTDOWN;
else
pr_warn(/* but going down anyway, so... */
"Concurrent 'rmmod rcutorture' and shutdown illegal!\n");
mutex_unlock(&fullstop_mutex);
return NOTIFY_DONE;
}
/*
* Allocate an element from the rcu_tortures pool.
*/
@ -1098,10 +1081,6 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
onoff_interval, onoff_holdoff);
}
static struct notifier_block rcutorture_shutdown_nb = {
.notifier_call = rcutorture_shutdown_notify,
};
static void rcutorture_booster_cleanup(int cpu)
{
struct task_struct *t;
@ -1428,7 +1407,6 @@ rcu_torture_cleanup(void)
cur_ops->cb_barrier();
return;
}
unregister_reboot_notifier(&rcutorture_shutdown_nb);
rcu_torture_barrier_cleanup();
rcu_torture_stall_cleanup();
@ -1774,7 +1752,6 @@ rcu_torture_init(void)
firsterr = i;
goto unwind;
}
register_reboot_notifier(&rcutorture_shutdown_nb);
i = rcu_torture_stall_init();
if (i != 0) {
firsterr = i;

29
kernel/torture.c
View File

@ -54,8 +54,7 @@ static bool verbose;
int fullstop = FULLSTOP_RMMOD;
EXPORT_SYMBOL_GPL(fullstop);
DEFINE_MUTEX(fullstop_mutex);
EXPORT_SYMBOL_GPL(fullstop_mutex);
static DEFINE_MUTEX(fullstop_mutex);
#ifdef CONFIG_HOTPLUG_CPU
@ -422,14 +421,32 @@ EXPORT_SYMBOL_GPL(torture_shuffle_cleanup);
void torture_shutdown_absorb(const char *title)
{
while (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
pr_notice(
"torture thread %s parking due to system shutdown\n",
title);
pr_notice("torture thread %s parking due to system shutdown\n",
title);
schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
}
}
EXPORT_SYMBOL_GPL(torture_shutdown_absorb);
/*
* Detect and respond to a system shutdown.
*/
static int torture_shutdown_notify(struct notifier_block *unused1,
unsigned long unused2, void *unused3)
{
mutex_lock(&fullstop_mutex);
if (fullstop == FULLSTOP_DONTSTOP)
fullstop = FULLSTOP_SHUTDOWN;
else
pr_warn("Concurrent rmmod and shutdown illegal!\n");
mutex_unlock(&fullstop_mutex);
return NOTIFY_DONE;
}
static struct notifier_block torture_shutdown_nb = {
.notifier_call = torture_shutdown_notify,
};
/*
* Initialize torture module. Please note that this is -not- invoked via
* the usual module_init() mechanism, but rather by an explicit call from
@ -451,6 +468,7 @@ EXPORT_SYMBOL_GPL(torture_init_begin);
void __init torture_init_end(void)
{
mutex_unlock(&fullstop_mutex);
register_reboot_notifier(&torture_shutdown_nb);
}
EXPORT_SYMBOL_GPL(torture_init_end);
@ -474,6 +492,7 @@ bool torture_cleanup(void)
}
fullstop = FULLSTOP_RMMOD;
mutex_unlock(&fullstop_mutex);
unregister_reboot_notifier(&torture_shutdown_nb);
torture_shuffle_cleanup();
torture_onoff_cleanup();
return false;