From: tip-bot for Chris Wilson <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: paulmck@linux.vnet.ibm.com, nhaehnle@gmail.com,
peterz@infradead.org, dev@mblankhorst.nl,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
torvalds@linux-foundation.org, hpa@zytor.com, mingo@kernel.org,
akpm@linux-foundation.org, chris@chris-wilson.co.uk
Subject: [tip:locking/core] locking/ww_mutex: Add kselftests for ww_mutex AA deadlock detection
Date: Sat, 14 Jan 2017 04:54:00 -0800 [thread overview]
Message-ID: <tip-c22fb3807fd0a3bdd98c13c4d2190ab064e6c09d@git.kernel.org> (raw)
In-Reply-To: <20161201114711.28697-5-chris@chris-wilson.co.uk>
Commit-ID: c22fb3807fd0a3bdd98c13c4d2190ab064e6c09d
Gitweb: http://git.kernel.org/tip/c22fb3807fd0a3bdd98c13c4d2190ab064e6c09d
Author: Chris Wilson <chris@chris-wilson.co.uk>
AuthorDate: Thu, 1 Dec 2016 11:47:07 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 14 Jan 2017 11:37:15 +0100
locking/ww_mutex: Add kselftests for ww_mutex AA deadlock detection
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maarten Lankhorst <dev@mblankhorst.nl>
Cc: Nicolai Hähnle <nhaehnle@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161201114711.28697-5-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/test-ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 472d5b1..835fa7a 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -118,6 +118,41 @@ static int test_mutex(void)
return 0;
}
+static int test_aa(void)
+{
+ struct ww_mutex mutex;
+ struct ww_acquire_ctx ctx;
+ int ret;
+
+ ww_mutex_init(&mutex, &ww_class);
+ ww_acquire_init(&ctx, &ww_class);
+
+ ww_mutex_lock(&mutex, &ctx);
+
+ if (ww_mutex_trylock(&mutex)) {
+ pr_err("%s: trylocked itself!\n", __func__);
+ ww_mutex_unlock(&mutex);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = ww_mutex_lock(&mutex, &ctx);
+ if (ret != -EALREADY) {
+ pr_err("%s: missed deadlock for recursing, ret=%d\n",
+ __func__, ret);
+ if (!ret)
+ ww_mutex_unlock(&mutex);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = 0;
+out:
+ ww_mutex_unlock(&mutex);
+ ww_acquire_fini(&ctx);
+ return ret;
+}
+
static int __init test_ww_mutex_init(void)
{
int ret;
@@ -126,6 +161,10 @@ static int __init test_ww_mutex_init(void)
if (ret)
return ret;
+ ret = test_aa();
+ if (ret)
+ return ret;
+
return 0;
}
next prev parent reply other threads:[~2017-01-14 12:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-01 11:47 locking: Add kselftests for ww_mutex Chris Wilson
2016-12-01 11:47 ` [PATCH v2 1/8] locking: Fix compilation of __WW_MUTEX_INITIALIZER Chris Wilson
2016-12-16 14:50 ` Peter Zijlstra
2016-12-16 17:26 ` Chris Wilson
2017-01-14 12:52 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2016-12-01 11:47 ` [PATCH v2 2/8] locking: Add ww_mutex to locktorture test Chris Wilson
2017-01-14 12:52 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2016-12-01 11:47 ` [PATCH v2 3/8] locking: Begin kselftests for ww_mutex Chris Wilson
2017-01-14 12:53 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2016-12-01 11:47 ` [PATCH v2 4/8] locking: Add kselftests for ww_mutex AA deadlock detection Chris Wilson
2017-01-14 12:54 ` tip-bot for Chris Wilson [this message]
2016-12-01 11:47 ` [PATCH v2 5/8] locking: Add kselftests for ww_mutex ABBA " Chris Wilson
2017-01-14 12:54 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2016-12-01 11:47 ` [PATCH v2 6/8] locking: Add kselftests for resolving ww_mutex cyclic deadlocks Chris Wilson
2017-01-14 12:55 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2016-12-01 11:47 ` [PATCH v2 7/8] locking: Add kselftests for ww_mutex stress Chris Wilson
2017-01-14 12:55 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2017-01-19 20:13 ` Peter Zijlstra
2016-12-01 11:47 ` [PATCH v2 8/8] locking: Add ww_mutex to tools/testing/selftests Chris Wilson
2017-01-14 12:56 ` [tip:locking/core] locking/ww_mutex: " tip-bot for Chris Wilson
2017-02-22 14:29 ` locking: Add kselftests for ww_mutex Geert Uytterhoeven
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