[PATCH] drm/i915: Fix selecting CONFIG_DRM_KUNIT_TEST in debug builds

[Imre Deak]

Selecting an option which depends on other options only works if the
dependencies are guaranteed to be selected (as these dependencies will
not be automatically selected). CONFIG_DRM_KUNIT_TEST depends on DRM,
MMU and KUNIT the first two of which are guaranteed to be selected for
i915, but the last one is not. Hence, selecting CONFIG_DRM_KUNIT_TEST in
i915 debug builds may result in CONFIG_DRM_KUNIT_TEST being selected
without the CONFIG_KUNIT dependency being selected. This causes at least
the following compile error:

drivers/gpu/drm/tests/drm_bridge_test.c: In function ‘drm_test_bridge_alloc_init’:
drivers/gpu/drm/tests/drm_bridge_test.c:449:21: error: implicit declaration of function ‘kunit_device_register’; did you mean ‘root_device_register’? [-Werror=implicit-function-declaration]
  449 |         priv->dev = kunit_device_register(test, "drm-bridge-dev");

Fix the above by selecting CONFIG_DRM_KUNIT_TEST only if CONFIG_KUNIT is
also selected.

Fixes: 17133255a322 ("drm/i915: replace DRM_DEBUG_SELFTEST with DRM_KUNIT_TEST")
Cc: Ruben Wauters <rubenru09 at aol.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index b15b1cecb3aad..3562a02ef7adc 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -50,7 +50,7 @@ config DRM_I915_DEBUG
 	select DRM_VGEM # used by igt/prime_vgem (dmabuf interop checks)
 	select DRM_DEBUG_MM if DRM=y
 	select DRM_EXPORT_FOR_TESTS if m
-	select DRM_KUNIT_TEST
+	select DRM_KUNIT_TEST if KUNIT
 	select DMABUF_SELFTESTS
 	select SW_SYNC # signaling validation framework (igt/syncobj*)
 	select DRM_I915_WERROR
-- 
2.49.1