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-rw-r--r--Documentation/locking/locktorture.txt2
-rw-r--r--kernel/locking/locktorture.c41
2 files changed, 41 insertions, 2 deletions
diff --git a/Documentation/locking/locktorture.txt b/Documentation/locking/locktorture.txt
index 3eb9b81454d0..f2a905b27862 100644
--- a/Documentation/locking/locktorture.txt
+++ b/Documentation/locking/locktorture.txt
@@ -40,6 +40,8 @@ torture_type Type of lock to torture. By default, only spinlocks will
o "spin_lock_irq": spin_lock_irq() and spin_unlock_irq()
pairs.
+ o "mutex_lock": mutex_lock() and mutex_unlock() pairs.
+
torture_runnable Start locktorture at boot time in the case where the
module is built into the kernel, otherwise wait for
torture_runnable to be set via sysfs before starting.
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 8c770b2c6e2a..414ba45d580f 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -27,6 +27,7 @@
#include <linux/kthread.h>
#include <linux/err.h>
#include <linux/spinlock.h>
+#include <linux/mutex.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
@@ -66,7 +67,7 @@ torture_param(bool, verbose, true,
static char *torture_type = "spin_lock";
module_param(torture_type, charp, 0444);
MODULE_PARM_DESC(torture_type,
- "Type of lock to torture (spin_lock, spin_lock_irq, ...)");
+ "Type of lock to torture (spin_lock, spin_lock_irq, mutex_lock, ...)");
static atomic_t n_lock_torture_errors;
@@ -206,6 +207,42 @@ static struct lock_torture_ops spin_lock_irq_ops = {
.name = "spin_lock_irq"
};
+static DEFINE_MUTEX(torture_mutex);
+
+static int torture_mutex_lock(void) __acquires(torture_mutex)
+{
+ mutex_lock(&torture_mutex);
+ return 0;
+}
+
+static void torture_mutex_delay(struct torture_random_state *trsp)
+{
+ const unsigned long longdelay_ms = 100;
+
+ /* We want a long delay occasionally to force massive contention. */
+ if (!(torture_random(trsp) %
+ (nrealwriters_stress * 2000 * longdelay_ms)))
+ mdelay(longdelay_ms * 5);
+ else
+ mdelay(longdelay_ms / 5);
+#ifdef CONFIG_PREEMPT
+ if (!(torture_random(trsp) % (nrealwriters_stress * 20000)))
+ preempt_schedule(); /* Allow test to be preempted. */
+#endif
+}
+
+static void torture_mutex_unlock(void) __releases(torture_mutex)
+{
+ mutex_unlock(&torture_mutex);
+}
+
+static struct lock_torture_ops mutex_lock_ops = {
+ .writelock = torture_mutex_lock,
+ .write_delay = torture_mutex_delay,
+ .writeunlock = torture_mutex_unlock,
+ .name = "mutex_lock"
+};
+
/*
* Lock torture writer kthread. Repeatedly acquires and releases
* the lock, checking for duplicate acquisitions.
@@ -352,7 +389,7 @@ static int __init lock_torture_init(void)
int i;
int firsterr = 0;
static struct lock_torture_ops *torture_ops[] = {
- &lock_busted_ops, &spin_lock_ops, &spin_lock_irq_ops,
+ &lock_busted_ops, &spin_lock_ops, &spin_lock_irq_ops, &mutex_lock_ops,
};
if (!torture_init_begin(torture_type, verbose, &torture_runnable))