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authorDavidlohr Bueso <dave@stgolabs.net>2014-09-29 06:14:25 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-09-30 00:10:02 -0700
commita1229491006a3d55cc0d7e6d496be39915ccefdd (patch)
treefec585adeb011833630c936148f4cf722d62e96d /kernel/locking
parent219f800f99db6f4e43a582cb9e0d98931f13c012 (diff)
downloadlinux-a1229491006a3d55cc0d7e6d496be39915ccefdd.tar.bz2
locktorture: Cannot hold read and write lock
... trigger an error if so. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/locktorture.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 9e9cd111fb0f..b05dc46c4297 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");