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Date:   Fri, 19 Mar 2021 12:54:17 -0000
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Subject: [tip: locking/core] locking/locktorture: Pass thread id to
 lock/unlock functions
Cc:     Waiman Long <longman@redhat.com>, Ingo Molnar <mingo@kernel.org>,
        x86@kernel.org, linux-kernel@vger.kernel.org
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The following commit has been merged into the locking/core branch of tip:

Commit-ID:     aa3a5f31877e5dc131cc286ce707413d441c8375
Gitweb:        https://git.kernel.org/tip/aa3a5f31877e5dc131cc286ce707413d441c8375
Author:        Waiman Long <longman@redhat.com>
AuthorDate:    Thu, 18 Mar 2021 13:28:13 -04:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Fri, 19 Mar 2021 12:13:10 +01:00

locking/locktorture: Pass thread id to lock/unlock functions

To allow the lock and unlock functions in locktorture to access
per-thread information, we need to pass some hint on how to locate
those information. One way to do this is to pass in a unique thread
id which can then be used to access a global array for thread specific
information.

Change the lock and unlock method to add a thread id parameter which
can be determined by the offset of the lwsp/lrsp pointer from the global
lwsa/lrsa array.

There is no other functional change in this patch.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210318172814.4400-5-longman@redhat.com
---
 kernel/locking/locktorture.c | 94 +++++++++++++++++++++--------------
 1 file changed, 58 insertions(+), 36 deletions(-)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 3c27f43..90a975a 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -76,13 +76,13 @@ static void lock_torture_cleanup(void);
 struct lock_torture_ops {
 	void (*init)(void);
 	void (*exit)(void);
-	int (*writelock)(void);
+	int (*writelock)(int tid);
 	void (*write_delay)(struct torture_random_state *trsp);
 	void (*task_boost)(struct torture_random_state *trsp);
-	void (*writeunlock)(void);
-	int (*readlock)(void);
+	void (*writeunlock)(int tid);
+	int (*readlock)(int tid);
 	void (*read_delay)(struct torture_random_state *trsp);
-	void (*readunlock)(void);
+	void (*readunlock)(int tid);
 
 	unsigned long flags; /* for irq spinlocks */
 	const char *name;
@@ -105,7 +105,7 @@ static struct lock_torture_cxt cxt = { 0, 0, false, false,
  * Definitions for lock torture testing.
  */
 
-static int torture_lock_busted_write_lock(void)
+static int torture_lock_busted_write_lock(int tid __maybe_unused)
 {
 	return 0;  /* BUGGY, do not use in real life!!! */
 }
@@ -122,7 +122,7 @@ static void torture_lock_busted_write_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_lock_busted_write_unlock(void)
+static void torture_lock_busted_write_unlock(int tid __maybe_unused)
 {
 	  /* BUGGY, do not use in real life!!! */
 }
@@ -145,7 +145,8 @@ static struct lock_torture_ops lock_busted_ops = {
 
 static DEFINE_SPINLOCK(torture_spinlock);
 
-static int torture_spin_lock_write_lock(void) __acquires(torture_spinlock)
+static int torture_spin_lock_write_lock(int tid __maybe_unused)
+__acquires(torture_spinlock)
 {
 	spin_lock(&torture_spinlock);
 	return 0;
@@ -169,7 +170,8 @@ static void torture_spin_lock_write_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_spin_lock_write_unlock(void) __releases(torture_spinlock)
+static void torture_spin_lock_write_unlock(int tid __maybe_unused)
+__releases(torture_spinlock)
 {
 	spin_unlock(&torture_spinlock);
 }
@@ -185,7 +187,7 @@ static struct lock_torture_ops spin_lock_ops = {
 	.name		= "spin_lock"
 };
 
-static int torture_spin_lock_write_lock_irq(void)
+static int torture_spin_lock_write_lock_irq(int tid __maybe_unused)
 __acquires(torture_spinlock)
 {
 	unsigned long flags;
@@ -195,7 +197,7 @@ __acquires(torture_spinlock)
 	return 0;
 }
 
-static void torture_lock_spin_write_unlock_irq(void)
+static void torture_lock_spin_write_unlock_irq(int tid __maybe_unused)
 __releases(torture_spinlock)
 {
 	spin_unlock_irqrestore(&torture_spinlock, cxt.cur_ops->flags);
@@ -214,7 +216,8 @@ static struct lock_torture_ops spin_lock_irq_ops = {
 
 static DEFINE_RWLOCK(torture_rwlock);
 
-static int torture_rwlock_write_lock(void) __acquires(torture_rwlock)
+static int torture_rwlock_write_lock(int tid __maybe_unused)
+__acquires(torture_rwlock)
 {
 	write_lock(&torture_rwlock);
 	return 0;
@@ -235,12 +238,14 @@ static void torture_rwlock_write_delay(struct torture_random_state *trsp)
 		udelay(shortdelay_us);
 }
 
-static void torture_rwlock_write_unlock(void) __releases(torture_rwlock)
+static void torture_rwlock_write_unlock(int tid __maybe_unused)
+__releases(torture_rwlock)
 {
 	write_unlock(&torture_rwlock);
 }
 
-static int torture_rwlock_read_lock(void) __acquires(torture_rwlock)
+static int torture_rwlock_read_lock(int tid __maybe_unused)
+__acquires(torture_rwlock)
 {
 	read_lock(&torture_rwlock);
 	return 0;
@@ -261,7 +266,8 @@ static void torture_rwlock_read_delay(struct torture_random_state *trsp)
 		udelay(shortdelay_us);
 }
 
-static void torture_rwlock_read_unlock(void) __releases(torture_rwlock)
+static void torture_rwlock_read_unlock(int tid __maybe_unused)
+__releases(torture_rwlock)
 {
 	read_unlock(&torture_rwlock);
 }
@@ -277,7 +283,8 @@ static struct lock_torture_ops rw_lock_ops = {
 	.name		= "rw_lock"
 };
 
-static int torture_rwlock_write_lock_irq(void) __acquires(torture_rwlock)
+static int torture_rwlock_write_lock_irq(int tid __maybe_unused)
+__acquires(torture_rwlock)
 {
 	unsigned long flags;
 
@@ -286,13 +293,14 @@ static int torture_rwlock_write_lock_irq(void) __acquires(torture_rwlock)
 	return 0;
 }
 
-static void torture_rwlock_write_unlock_irq(void)
+static void torture_rwlock_write_unlock_irq(int tid __maybe_unused)
 __releases(torture_rwlock)
 {
 	write_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);
 }
 
-static int torture_rwlock_read_lock_irq(void) __acquires(torture_rwlock)
+static int torture_rwlock_read_lock_irq(int tid __maybe_unused)
+__acquires(torture_rwlock)
 {
 	unsigned long flags;
 
@@ -301,7 +309,7 @@ static int torture_rwlock_read_lock_irq(void) __acquires(torture_rwlock)
 	return 0;
 }
 
-static void torture_rwlock_read_unlock_irq(void)
+static void torture_rwlock_read_unlock_irq(int tid __maybe_unused)
 __releases(torture_rwlock)
 {
 	read_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);
@@ -320,7 +328,8 @@ static struct lock_torture_ops rw_lock_irq_ops = {
 
 static DEFINE_MUTEX(torture_mutex);
 
-static int torture_mutex_lock(void) __acquires(torture_mutex)
+static int torture_mutex_lock(int tid __maybe_unused)
+__acquires(torture_mutex)
 {
 	mutex_lock(&torture_mutex);
 	return 0;
@@ -340,7 +349,8 @@ static void torture_mutex_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_mutex_unlock(void) __releases(torture_mutex)
+static void torture_mutex_unlock(int tid __maybe_unused)
+__releases(torture_mutex)
 {
 	mutex_unlock(&torture_mutex);
 }
@@ -372,7 +382,7 @@ static void torture_ww_mutex_init(void)
 	ww_mutex_init(&torture_ww_mutex_2, &torture_ww_class);
 }
 
-static int torture_ww_mutex_lock(void)
+static int torture_ww_mutex_lock(int tid __maybe_unused)
 __acquires(torture_ww_mutex_0)
 __acquires(torture_ww_mutex_1)
 __acquires(torture_ww_mutex_2)
@@ -417,7 +427,7 @@ __acquires(torture_ww_mutex_2)
 	return 0;
 }
 
-static void torture_ww_mutex_unlock(void)
+static void torture_ww_mutex_unlock(int tid __maybe_unused)
 __releases(torture_ww_mutex_0)
 __releases(torture_ww_mutex_1)
 __releases(torture_ww_mutex_2)
@@ -442,7 +452,8 @@ static struct lock_torture_ops ww_mutex_lock_ops = {
 #ifdef CONFIG_RT_MUTEXES
 static DEFINE_RT_MUTEX(torture_rtmutex);
 
-static int torture_rtmutex_lock(void) __acquires(torture_rtmutex)
+static int torture_rtmutex_lock(int tid __maybe_unused)
+__acquires(torture_rtmutex)
 {
 	rt_mutex_lock(&torture_rtmutex);
 	return 0;
@@ -498,7 +509,8 @@ static void torture_rtmutex_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_rtmutex_unlock(void) __releases(torture_rtmutex)
+static void torture_rtmutex_unlock(int tid __maybe_unused)
+__releases(torture_rtmutex)
 {
 	rt_mutex_unlock(&torture_rtmutex);
 }
@@ -516,7 +528,8 @@ static struct lock_torture_ops rtmutex_lock_ops = {
 #endif
 
 static DECLARE_RWSEM(torture_rwsem);
-static int torture_rwsem_down_write(void) __acquires(torture_rwsem)
+static int torture_rwsem_down_write(int tid __maybe_unused)
+__acquires(torture_rwsem)
 {
 	down_write(&torture_rwsem);
 	return 0;
@@ -536,12 +549,14 @@ static void torture_rwsem_write_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_rwsem_up_write(void) __releases(torture_rwsem)
+static void torture_rwsem_up_write(int tid __maybe_unused)
+__releases(torture_rwsem)
 {
 	up_write(&torture_rwsem);
 }
 
-static int torture_rwsem_down_read(void) __acquires(torture_rwsem)
+static int torture_rwsem_down_read(int tid __maybe_unused)
+__acquires(torture_rwsem)
 {
 	down_read(&torture_rwsem);
 	return 0;
@@ -561,7 +576,8 @@ static void torture_rwsem_read_delay(struct torture_random_state *trsp)
 		torture_preempt_schedule();  /* Allow test to be preempted. */
 }
 
-static void torture_rwsem_up_read(void) __releases(torture_rwsem)
+static void torture_rwsem_up_read(int tid __maybe_unused)
+__releases(torture_rwsem)
 {
 	up_read(&torture_rwsem);
 }
@@ -590,24 +606,28 @@ static void torture_percpu_rwsem_exit(void)
 	percpu_free_rwsem(&pcpu_rwsem);
 }
 
-static int torture_percpu_rwsem_down_write(void) __acquires(pcpu_rwsem)
+static int torture_percpu_rwsem_down_write(int tid __maybe_unused)
+__acquires(pcpu_rwsem)
 {
 	percpu_down_write(&pcpu_rwsem);
 	return 0;
 }
 
-static void torture_percpu_rwsem_up_write(void) __releases(pcpu_rwsem)
+static void torture_percpu_rwsem_up_write(int tid __maybe_unused)
+__releases(pcpu_rwsem)
 {
 	percpu_up_write(&pcpu_rwsem);
 }
 
-static int torture_percpu_rwsem_down_read(void) __acquires(pcpu_rwsem)
+static int torture_percpu_rwsem_down_read(int tid __maybe_unused)
+__acquires(pcpu_rwsem)
 {
 	percpu_down_read(&pcpu_rwsem);
 	return 0;
 }
 
-static void torture_percpu_rwsem_up_read(void) __releases(pcpu_rwsem)
+static void torture_percpu_rwsem_up_read(int tid __maybe_unused)
+__releases(pcpu_rwsem)
 {
 	percpu_up_read(&pcpu_rwsem);
 }
@@ -632,6 +652,7 @@ static struct lock_torture_ops percpu_rwsem_lock_ops = {
 static int lock_torture_writer(void *arg)
 {
 	struct lock_stress_stats *lwsp = arg;
+	int tid = lwsp - cxt.lwsa;
 	DEFINE_TORTURE_RANDOM(rand);
 
 	VERBOSE_TOROUT_STRING("lock_torture_writer task started");
@@ -642,7 +663,7 @@ static int lock_torture_writer(void *arg)
 			schedule_timeout_uninterruptible(1);
 
 		cxt.cur_ops->task_boost(&rand);
-		cxt.cur_ops->writelock();
+		cxt.cur_ops->writelock(tid);
 		if (WARN_ON_ONCE(lock_is_write_held))
 			lwsp->n_lock_fail++;
 		lock_is_write_held = true;
@@ -653,7 +674,7 @@ static int lock_torture_writer(void *arg)
 		cxt.cur_ops->write_delay(&rand);
 		lock_is_write_held = false;
 		WRITE_ONCE(last_lock_release, jiffies);
-		cxt.cur_ops->writeunlock();
+		cxt.cur_ops->writeunlock(tid);
 
 		stutter_wait("lock_torture_writer");
 	} while (!torture_must_stop());
@@ -670,6 +691,7 @@ static int lock_torture_writer(void *arg)
 static int lock_torture_reader(void *arg)
 {
 	struct lock_stress_stats *lrsp = arg;
+	int tid = lrsp - cxt.lrsa;
 	DEFINE_TORTURE_RANDOM(rand);
 
 	VERBOSE_TOROUT_STRING("lock_torture_reader task started");
@@ -679,7 +701,7 @@ static int lock_torture_reader(void *arg)
 		if ((torture_random(&rand) & 0xfffff) == 0)
 			schedule_timeout_uninterruptible(1);
 
-		cxt.cur_ops->readlock();
+		cxt.cur_ops->readlock(tid);
 		lock_is_read_held = true;
 		if (WARN_ON_ONCE(lock_is_write_held))
 			lrsp->n_lock_fail++; /* rare, but... */
@@ -687,7 +709,7 @@ static int lock_torture_reader(void *arg)
 		lrsp->n_lock_acquired++;
 		cxt.cur_ops->read_delay(&rand);
 		lock_is_read_held = false;
-		cxt.cur_ops->readunlock();
+		cxt.cur_ops->readunlock(tid);
 
 		stutter_wait("lock_torture_reader");
 	} while (!torture_must_stop());