linux-kernel - [RFC PATCH v2 3/3] kunit: kmalloc_array: Use kunit_add

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Date:   Fri, 31 Mar 2023 16:04:11 +0800
From:   David Gow <davidgow@...gle.com>
To:     Matti Vaittinen <mazziesaccount@...il.com>,
        Maxime Ripard <maxime@...no.tech>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        Rae Moar <rmoar@...gle.com>,
        Benjamin Berg <benjamin@...solutions.net>
Cc:     David Gow <davidgow@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com
Subject: [RFC PATCH v2 3/3] kunit: kmalloc_array: Use kunit_add_action()

The kunit_add_action() function is much simpler and cleaner to use that
the full KUnit resource API for simple things like the
kunit_kmalloc_array() functionality.

Replacing it allows us to get rid of a number of helper functions, and
leaves us with no uses of kunit_alloc_resource(), which has some
usability problems and is going to have its behaviour modified in an
upcoming patch.

Note that we need to use kunit_defer_trigger_all() to implement
kunit_kfree().

Signed-off-by: David Gow <davidgow@...gle.com>
---
 lib/kunit/test.c | 48 ++++++++----------------------------------------
 1 file changed, 8 insertions(+), 40 deletions(-)

diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index e2910b261112..ec45c8863f04 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -712,58 +712,26 @@ static struct notifier_block kunit_mod_nb = {
 };
 #endif
 
-struct kunit_kmalloc_array_params {
-	size_t n;
-	size_t size;
-	gfp_t gfp;
-};
-
-static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context)
+void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
 {
-	struct kunit_kmalloc_array_params *params = context;
-
-	res->data = kmalloc_array(params->n, params->size, params->gfp);
-	if (!res->data)
-		return -ENOMEM;
-
-	return 0;
-}
+	void *data;
 
-static void kunit_kmalloc_array_free(struct kunit_resource *res)
-{
-	kfree(res->data);
-}
+	data = kmalloc_array(n, size, gfp);
 
-void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
-{
-	struct kunit_kmalloc_array_params params = {
-		.size = size,
-		.n = n,
-		.gfp = gfp
-	};
+	if (!data)
+		return NULL;
 
-	return kunit_alloc_resource(test,
-				    kunit_kmalloc_array_init,
-				    kunit_kmalloc_array_free,
-				    gfp,
-				    &params);
+	kunit_add_action(test, (kunit_defer_function_t)kfree, data, gfp);
+	return data;
 }
 EXPORT_SYMBOL_GPL(kunit_kmalloc_array);
 
-static inline bool kunit_kfree_match(struct kunit *test,
-				     struct kunit_resource *res, void *match_data)
-{
-	/* Only match resources allocated with kunit_kmalloc() and friends. */
-	return res->free == kunit_kmalloc_array_free && res->data == match_data;
-}
-
 void kunit_kfree(struct kunit *test, const void *ptr)
 {
 	if (!ptr)
 		return;
 
-	if (kunit_destroy_resource(test, kunit_kfree_match, (void *)ptr))
-		KUNIT_FAIL(test, "kunit_kfree: %px already freed or not allocated by kunit", ptr);
+	kunit_release_action(test, (kunit_defer_function_t)kfree, (void *)ptr);
 }
 EXPORT_SYMBOL_GPL(kunit_kfree);
 
-- 
2.40.0.348.gf938b09366-goog