Re: [PATCH 14/19] gpu: drm: selftests: test-drm_dp_mst_helper: Place 'struct drm_dp_sideband_msg_req_body' onto the heap

[Ville Syrjälä]

On Thu, Nov 05, 2020 at 02:45:12PM +0000, Lee Jones wrote:
> The stack is too full.
> 
> Fixes the following W=1 kernel build warning(s):
> 
>  drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c: In function ‘sideband_msg_req_encode_decode’:
>  drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c:161:1: warning: the frame size of 1176 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: David Francis <David.Francis@xxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
>  .../drm/selftests/test-drm_dp_mst_helper.c    | 29 ++++++++++++-------
>  1 file changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> index 1d696ec001cff..0a539456f6864 100644
> --- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> @@ -120,44 +120,51 @@ sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in,
>  static bool
>  sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
>  {
> -	struct drm_dp_sideband_msg_req_body out = {0};
> +	struct drm_dp_sideband_msg_req_body *out;

How big is it? And why is it that big?

-- 
Ville Syrjälä
Intel