Re: [PATCH] drm/test: drm_exec: use kzalloc() to allocate GEM objects

[Alice Ryhl <aliceryhl@google.com>]

On Fri, Aug 29, 2025 at 09:55:39AM +0200, Danilo Krummrich wrote:
> Since commit e7fa80e2932c ("drm_gem: add mutex to drm_gem_object.gpuva")
> it is possible for test_prepare_array() to exceed a stack frame size of
> 2048 bytes depending on the exact configuration of the kernel.
> 
>   drivers/gpu/drm/tests/drm_exec_test.c: In function ‘test_prepare_array’:
>   drivers/gpu/drm/tests/drm_exec_test.c:171:1: error: the frame size of 2128 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>     171 | }
>         | ^
>   cc1: all warnings being treated as errors
>   make[6]: *** [scripts/Makefile.build:287: drivers/gpu/drm/tests/drm_exec_test.o] Error 1
>   make[6]: *** Waiting for unfinished jobs....
> 
> In order to fix this, allocate the GEM objects in test_prepare_array()
> with kzalloc(), rather than placing them on the stack.
> 
> Cc: Alice Ryhl <aliceryhl@google.com>
> Cc: Christian König <christian.koenig@amd.com>
> Fixes: e7fa80e2932c ("drm_gem: add mutex to drm_gem_object.gpuva")
> Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Reviewed-by: Alice Ryhl <aliceryhl@google.com>