linux-kernel - [PATCH 2/3] drm/tests: Use KUNIT_DEFINE_ACTION

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Date:   Sat, 11 Nov 2023 04:08:27 +0800
From:   David Gow <davidgow@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Rae Moar <rmoar@...gle.com>, dlatypov@...gle.com,
        Maxime Ripard <mripard@...nel.org>,
        Arthur Grillo <arthurgrillo@...eup.net>,
        Shuah Khan <skhan@...uxfoundation.org>
Cc:     David Gow <davidgow@...gle.com>,
        "Maíra Canal" <mairacanal@...eup.net>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        kunit-dev@...glegroups.com, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Benjamin Berg <benjamin.berg@...el.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        linux-kernel@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 2/3] drm/tests: Use KUNIT_DEFINE_ACTION_WRAPPER()

In order to pass functions to kunit_add_action(), they need to be of the
kunit_action_t type. While casting the function pointer can work, it
will break control-flow integrity.

drm_kunit_helpers already defines wrappers, but we now have a macro
which does this automatically. Using this greatly reduces the
boilerplate needed.

Signed-off-by: David Gow <davidgow@...gle.com>
---

This patch should be a no-op, just moving to use a standard macro to
implement these wrappers rather than hand-coding them.

Let me know if you'd prefer to take these in separately via the drm
trees, or if you're okay with having this whole series go via
kselftest/kunit.

Cheers,
-- David

---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 30 +++++++----------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index bccb33b900f3..c251e6b34de0 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -27,27 +27,15 @@ static struct platform_driver fake_platform_driver = {
 	},
 };
 
-static void kunit_action_platform_driver_unregister(void *ptr)
-{
-	struct platform_driver *drv = ptr;
-
-	platform_driver_unregister(drv);
-
-}
-
-static void kunit_action_platform_device_put(void *ptr)
-{
-	struct platform_device *pdev = ptr;
-
-	platform_device_put(pdev);
-}
-
-static void kunit_action_platform_device_del(void *ptr)
-{
-	struct platform_device *pdev = ptr;
-
-	platform_device_del(pdev);
-}
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_driver_unregister,
+			    platform_driver_unregister,
+			    struct platform_driver *);
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_put,
+			    platform_device_put,
+			    struct platform_device *);
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_del,
+			    platform_device_del,
+			    struct platform_device *);
 
 /**
  * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
-- 
2.42.0.869.gea05f2083d-goog