Re: [PATCH v2] drm/ttm/tests: Fix build failure on PREEMPT_RT

["Hogander, Jouni" <jouni.hogander@intel.com>]

On Wed, 2026-03-04 at 09:56 +0100, Maarten Lankhorst wrote:
> Fix a compile error in the kunit tests when CONFIG_PREEMPT_RT is
> enabled, and the normal mutex is converted into a rtmutex.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes:
> https://lore.kernel.org/oe-kbuild-all/202602261547.3bM6yVAS-lkp@intel.com/
> Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

> ---
> Changes since v1:
> - Use the correct locking primitive (Jouni)
> 
>  drivers/gpu/drm/ttm/tests/ttm_bo_test.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> index d468f83220720..f3103307b5df9 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> +++ b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> @@ -222,13 +222,13 @@ static void ttm_bo_reserve_interrupted(struct
> kunit *test)
>  		KUNIT_FAIL(test, "Couldn't create ttm bo reserve
> task\n");
>  
>  	/* Take a lock so the threaded reserve has to wait */
> -	mutex_lock(&bo->base.resv->lock.base);
> +	dma_resv_lock(bo->base.resv, NULL);
>  
>  	wake_up_process(task);
>  	msleep(20);
>  	err = kthread_stop(task);
>  
> -	mutex_unlock(&bo->base.resv->lock.base);
> +	dma_resv_unlock(bo->base.resv);
>  
>  	KUNIT_ASSERT_EQ(test, err, -ERESTARTSYS);
>  }