Commit-ID: a1229491006a3d55cc0d7e6d496be39915ccefdd
Gitweb: http://git.kernel.org/tip/a1229491006a3d55cc0d7e6d496be39915ccefdd
Author: Davidlohr Bueso <dave@xxxxxxxxxxxx>
AuthorDate: Mon, 29 Sep 2014 06:14:25 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 30 Sep 2014 00:10:02 -0700
locktorture: Cannot hold read and write lock
... trigger an error if so.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/locking/locktorture.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 9e9cd11..b05dc46 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -453,14 +453,19 @@ static int lock_torture_writer(void *arg)
do {
if ((torture_random(&rand) & 0xfffff) == 0)
schedule_timeout_uninterruptible(1);
+
cxt.cur_ops->writelock();
if (WARN_ON_ONCE(lock_is_write_held))
lwsp->n_lock_fail++;
lock_is_write_held = 1;
+ if (WARN_ON_ONCE(lock_is_read_held))
+ lwsp->n_lock_fail++; /* rare, but... */
+
lwsp->n_lock_acquired++;
cxt.cur_ops->write_delay(&rand);
lock_is_write_held = 0;
cxt.cur_ops->writeunlock();
+
stutter_wait("lock_torture_writer");
} while (!torture_must_stop());
torture_kthread_stopping("lock_torture_writer");
@@ -482,12 +487,17 @@ static int lock_torture_reader(void *arg)
do {
if ((torture_random(&rand) & 0xfffff) == 0)
schedule_timeout_uninterruptible(1);
+
cxt.cur_ops->readlock();
lock_is_read_held = 1;
+ if (WARN_ON_ONCE(lock_is_write_held))
+ lrsp->n_lock_fail++; /* rare, but... */
+
lrsp->n_lock_acquired++;
cxt.cur_ops->read_delay(&rand);
lock_is_read_held = 0;
cxt.cur_ops->readunlock();
+
stutter_wait("lock_torture_reader");
} while (!torture_must_stop());
torture_kthread_stopping("lock_torture_reader");
--
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