linux-kernel - [tip:locking/core] locking/ww_mutex: Add kselftests for ww

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Date:   Sat, 14 Jan 2017 04:54:00 -0800
From:   tip-bot for Chris Wilson <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     paulmck@...ux.vnet.ibm.com, nhaehnle@...il.com,
        peterz@...radead.org, dev@...ankhorst.nl,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        torvalds@...ux-foundation.org, hpa@...or.com, mingo@...nel.org,
        akpm@...ux-foundation.org, chris@...is-wilson.co.uk
Subject: [tip:locking/core] locking/ww_mutex: Add kselftests for ww_mutex AA
 deadlock detection

Commit-ID:  c22fb3807fd0a3bdd98c13c4d2190ab064e6c09d
Gitweb:     http://git.kernel.org/tip/c22fb3807fd0a3bdd98c13c4d2190ab064e6c09d
Author:     Chris Wilson <chris@...is-wilson.co.uk>
AuthorDate: Thu, 1 Dec 2016 11:47:07 +0000
Committer:  Ingo Molnar <mingo@...nel.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@...is-wilson.co.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Maarten Lankhorst <dev@...ankhorst.nl>
Cc: Nicolai Hähnle <nhaehnle@...il.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20161201114711.28697-5-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.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;
 }