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From: glittao@gmail.com
To: brendanhiggins@google.com, cl@linux.com, penberg@kernel.org,
	rientjes@google.com, iamjoonsoo.kim@lge.com,
	akpm@linux-foundation.org, vbabka@suse.cz
Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	kunit-dev@googlegroups.com, linux-mm@kvack.org, elver@google.com,
	dlatypov@google.com, Oliver Glitta <glittao@gmail.com>
Subject: [PATCH v5 1/3] kunit: make test->lock irq safe
Date: Tue, 11 May 2021 17:07:32 +0200	[thread overview]
Message-ID: <20210511150734.3492-1-glittao@gmail.com> (raw)

From: Vlastimil Babka <vbabka@suse.cz>

The upcoming SLUB kunit test will be calling kunit_find_named_resource() from
a context with disabled interrupts. That means kunit's test->lock needs to be
IRQ safe to avoid potential deadlocks and lockdep splats.

This patch therefore changes the test->lock usage to spin_lock_irqsave()
and spin_unlock_irqrestore().

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Oliver Glitta <glittao@gmail.com>
---
Changes since v4
Rebased whole series on 5.13-rc1

 include/kunit/test.h |  5 +++--
 lib/kunit/test.c     | 18 +++++++++++-------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 49601c4b98b8..524d4789af22 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -515,8 +515,9 @@ kunit_find_resource(struct kunit *test,
 		    void *match_data)
 {
 	struct kunit_resource *res, *found = NULL;
+	unsigned long flags;

-	spin_lock(&test->lock);
+	spin_lock_irqsave(&test->lock, flags);

 	list_for_each_entry_reverse(res, &test->resources, node) {
 		if (match(test, res, (void *)match_data)) {
@@ -526,7 +527,7 @@ kunit_find_resource(struct kunit *test,
 		}
 	}

-	spin_unlock(&test->lock);
+	spin_unlock_irqrestore(&test->lock, flags);

 	return found;
 }
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 2f6cc0123232..45f068864d76 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -475,6 +475,7 @@ int kunit_add_resource(struct kunit *test,
 		       void *data)
 {
 	int ret = 0;
+	unsigned long flags;

 	res->free = free;
 	kref_init(&res->refcount);
@@ -487,10 +488,10 @@ int kunit_add_resource(struct kunit *test,
 		res->data = data;
 	}

-	spin_lock(&test->lock);
+	spin_lock_irqsave(&test->lock, flags);
 	list_add_tail(&res->node, &test->resources);
 	/* refcount for list is established by kref_init() */
-	spin_unlock(&test->lock);
+	spin_unlock_irqrestore(&test->lock, flags);

 	return ret;
 }
@@ -548,9 +549,11 @@ EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource);

 void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
 {
-	spin_lock(&test->lock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&test->lock, flags);
 	list_del(&res->node);
-	spin_unlock(&test->lock);
+	spin_unlock_irqrestore(&test->lock, flags);
 	kunit_put_resource(res);
 }
 EXPORT_SYMBOL_GPL(kunit_remove_resource);
@@ -630,6 +633,7 @@ EXPORT_SYMBOL_GPL(kunit_kfree);
 void kunit_cleanup(struct kunit *test)
 {
 	struct kunit_resource *res;
+	unsigned long flags;

 	/*
 	 * test->resources is a stack - each allocation must be freed in the
@@ -641,9 +645,9 @@ void kunit_cleanup(struct kunit *test)
 	 * protect against the current node being deleted, not the next.
 	 */
 	while (true) {
-		spin_lock(&test->lock);
+		spin_lock_irqsave(&test->lock, flags);
 		if (list_empty(&test->resources)) {
-			spin_unlock(&test->lock);
+			spin_unlock_irqrestore(&test->lock, flags);
 			break;
 		}
 		res = list_last_entry(&test->resources,
@@ -654,7 +658,7 @@ void kunit_cleanup(struct kunit *test)
 		 * resource, and this can't happen if the test->lock
 		 * is held.
 		 */
-		spin_unlock(&test->lock);
+		spin_unlock_irqrestore(&test->lock, flags);
 		kunit_remove_resource(test, res);
 	}
 	current->kunit_test = NULL;
--
2.31.1.272.g89b43f80a5


             reply	other threads:[~2021-05-11 15:07 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11 15:07 glittao [this message]
2021-05-11 15:07 ` [PATCH v5 2/3] mm/slub, kunit: add a KUnit test for SLUB debugging functionality glittao
2021-05-11 15:16   ` Marco Elver
2021-05-12 10:30     ` Vlastimil Babka
2021-05-12 14:06   ` [PATCH] mm/slub, kunit: add a KUnit test for SLUB debugging functionality-fix glittao
2021-05-13  4:44   ` [PATCH v5 2/3] mm/slub, kunit: add a KUnit test for SLUB debugging functionality Andrew Morton
2021-05-13  8:54     ` Marco Elver
2021-05-13  9:32     ` Oliver Glitta
2021-05-11 15:07 ` [PATCH v5 3/3] slub: remove resiliency_test() function glittao
2021-05-12 10:28 ` [PATCH v5 1/3] kunit: make test->lock irq safe Vlastimil Babka

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