linux-kernel - Re: [PATCH 14/19] gpu: drm: selftests: test-drm_dp_mst_helper: Place 'struct drm_dp_sideband_msg_req

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Date:   Mon, 9 Nov 2020 17:19:37 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     David Airlie <airlied@...ux.ie>,
        David Francis <David.Francis@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 14/19] gpu: drm: selftests: test-drm_dp_mst_helper: Place
 'struct drm_dp_sideband_msg_req_body' onto the heap

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@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Lyude Paul <lyude@...hat.com>
> Cc: David Francis <David.Francis@....com>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  .../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