[tip:core/mutexes] mutex: Add more tests to lib/locking-selftest.c

[tip-bot for Maarten Lankhorst]

Commit-ID:  2fe3d4b149ccebbb384062fbbe6634439f2bf120
Gitweb:     http://git.kernel.org/tip/2fe3d4b149ccebbb384062fbbe6634439f2bf120
Author:     Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
AuthorDate: Thu, 20 Jun 2013 13:31:30 +0200
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 26 Jun 2013 12:10:57 +0200

mutex: Add more tests to lib/locking-selftest.c

None of the ww_mutex codepaths should be taken in the 'normal'
mutex calls. The easiest way to verify this is by using the
normal mutex calls, and making sure o.ctx is unmodified.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: robclark@xxxxxxxxx
Cc: rostedt@xxxxxxxxxxx
Cc: daniel@xxxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20130620113130.4001.45423.stgit@patser
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 lib/locking-selftest.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 9962262..37faefd 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -1162,6 +1162,67 @@ static void ww_test_fail_acquire(void)
 #endif
 }
 
+static void ww_test_normal(void)
+{
+	int ret;
+
+	WWAI(&t);
+
+	/*
+	 * None of the ww_mutex codepaths should be taken in the 'normal'
+	 * mutex calls. The easiest way to verify this is by using the
+	 * normal mutex calls, and making sure o.ctx is unmodified.
+	 */
+
+	/* mutex_lock (and indirectly, mutex_lock_nested) */
+	o.ctx = (void *)~0UL;
+	mutex_lock(&o.base);
+	mutex_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* mutex_lock_interruptible (and *_nested) */
+	o.ctx = (void *)~0UL;
+	ret = mutex_lock_interruptible(&o.base);
+	if (!ret)
+		mutex_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* mutex_lock_killable (and *_nested) */
+	o.ctx = (void *)~0UL;
+	ret = mutex_lock_killable(&o.base);
+	if (!ret)
+		mutex_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* trylock, succeeding */
+	o.ctx = (void *)~0UL;
+	ret = mutex_trylock(&o.base);
+	WARN_ON(!ret);
+	if (ret)
+		mutex_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* trylock, failing */
+	o.ctx = (void *)~0UL;
+	mutex_lock(&o.base);
+	ret = mutex_trylock(&o.base);
+	WARN_ON(ret);
+	mutex_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* nest_lock */
+	o.ctx = (void *)~0UL;
+	mutex_lock_nest_lock(&o.base, &t);
+	mutex_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+}
+
 static void ww_test_two_contexts(void)
 {
 	WWAI(&t);
@@ -1415,6 +1476,7 @@ static void ww_tests(void)
 
 	print_testname("ww api failures");
 	dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
 	dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
 	printk("\n");
 
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