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Date: Mon, 17 Feb 2014 14:12:43 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
oleg@...hat.com, sbw@....edu,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 39/55] rcutorture: Stop generic kthreads in torture_cleanup()
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
The specific torture modules (like rcutorture) need to call
torture_cleanup() in any case, so this commit makes torture_cleanup()
deal with torture_shutdown_cleanup() and torture_stutter_cleanup() so
that the specific modules don't have to deal with these details.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
include/linux/torture.h | 2 --
kernel/rcu/rcutorture.c | 2 --
kernel/torture.c | 37 +++++++++++++++++++------------------
3 files changed, 19 insertions(+), 22 deletions(-)
diff --git a/include/linux/torture.h b/include/linux/torture.h
index db88e7c6ff5d..5440f7f4f14b 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -75,12 +75,10 @@ int torture_shuffle_init(long shuffint);
/* Test auto-shutdown handling. */
void torture_shutdown_absorb(const char *title);
int torture_shutdown_init(int ssecs, void (*cleanup)(void));
-void torture_shutdown_cleanup(void);
/* Task stuttering, which forces load/no-load transitions. */
void stutter_wait(const char *title);
int torture_stutter_init(int s);
-void torture_stutter_cleanup(void);
/* Initialization and cleanup. */
void torture_init_begin(char *ttype, bool v, int *runnable);
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index fc88144fd9e5..390189ecda05 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1268,7 +1268,6 @@ rcu_torture_cleanup(void)
rcu_torture_barrier_cleanup();
torture_stop_kthread(rcu_torture_stall, stall_task);
- torture_stutter_cleanup();
torture_stop_kthread(rcu_torture_writer, writer_task);
if (reader_tasks) {
@@ -1296,7 +1295,6 @@ rcu_torture_cleanup(void)
for_each_possible_cpu(i)
rcutorture_booster_cleanup(i);
}
- torture_shutdown_cleanup();
/* Wait for all RCU callbacks to fire. */
diff --git a/kernel/torture.c b/kernel/torture.c
index c0df3b66d084..a93ee5722b50 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -478,20 +478,6 @@ int torture_shutdown_init(int ssecs, void (*cleanup)(void))
EXPORT_SYMBOL_GPL(torture_shutdown_init);
/*
- * Shut down the shutdown task. Say what??? Heh! This can happen if
- * the torture module gets an rmmod before the shutdown time arrives. ;-)
- */
-void torture_shutdown_cleanup(void)
-{
- if (shutdown_task != NULL) {
- VERBOSE_TOROUT_STRING("Stopping torture_shutdown task");
- kthread_stop(shutdown_task);
- }
- shutdown_task = NULL;
-}
-EXPORT_SYMBOL_GPL(torture_shutdown_cleanup);
-
-/*
* Detect and respond to a system shutdown.
*/
static int torture_shutdown_notify(struct notifier_block *unused1,
@@ -513,6 +499,20 @@ static struct notifier_block torture_shutdown_nb = {
};
/*
+ * Shut down the shutdown task. Say what??? Heh! This can happen if
+ * the torture module gets an rmmod before the shutdown time arrives. ;-)
+ */
+static void torture_shutdown_cleanup(void)
+{
+ unregister_reboot_notifier(&torture_shutdown_nb);
+ if (shutdown_task != NULL) {
+ VERBOSE_TOROUT_STRING("Stopping torture_shutdown task");
+ kthread_stop(shutdown_task);
+ }
+ shutdown_task = NULL;
+}
+
+/*
* Variables for stuttering, which means to periodically pause and
* restart testing in order to catch bugs that appear when load is
* suddenly applied to or removed from the system.
@@ -575,7 +575,7 @@ EXPORT_SYMBOL_GPL(torture_stutter_init);
/*
* Cleanup after the torture_stutter kthread.
*/
-void torture_stutter_cleanup(void)
+static void torture_stutter_cleanup(void)
{
if (!stutter_task)
return;
@@ -583,7 +583,6 @@ void torture_stutter_cleanup(void)
kthread_stop(stutter_task);
stutter_task = NULL;
}
-EXPORT_SYMBOL_GPL(torture_stutter_cleanup);
/*
* Initialize torture module. Please note that this is -not- invoked via
@@ -619,7 +618,8 @@ EXPORT_SYMBOL_GPL(torture_init_end);
* Clean up torture module. Please note that this is -not- invoked via
* the usual module_exit() mechanism, but rather by an explicit call from
* the client torture module. Returns true if a race with system shutdown
- * is detected.
+ * is detected, otherwise, all kthreads started by functions in this file
+ * will be shut down.
*
* This must be called before the caller starts shutting down its own
* kthreads.
@@ -635,8 +635,9 @@ bool torture_cleanup(void)
}
ACCESS_ONCE(fullstop) = FULLSTOP_RMMOD;
mutex_unlock(&fullstop_mutex);
- unregister_reboot_notifier(&torture_shutdown_nb);
+ torture_shutdown_cleanup();
torture_shuffle_cleanup();
+ torture_stutter_cleanup();
torture_onoff_cleanup();
return false;
}
--
1.8.1.5
--
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