linux-kernel - Re: [PATCH] drm/dp_mst: Fix drm_dp_mst_topology.c selftest compilation warning

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Date:   Mon, 13 Apr 2020 10:08:38 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Shengju Zhang <zhangshengju@...s.chinamobile.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/dp_mst: Fix drm_dp_mst_topology.c selftest
 compilation warning

On Mon, Apr 13, 2020 at 5:29 AM Tang Bin <tangbin@...s.chinamobile.com> wrote:
>
> The struct drm_dp_desc contains struct drm_dp_dpcd_ident, and the struct
> drm_dp_dpcd_ident contains the array, so zero-initialization requires a
> more couple of braces. In the ARM compiler environment, the compile
> warning pointing it out:
>     drivers/gpu/drm/drm_dp_mst_topology.c: In function 'drm_dp_mst_dsc_aux_for_port':
>     drivers/gpu/drm/drm_dp_mst_topology.c:5494:9: warning: missing braces around initializer [-Wmissing-braces]
>       struct drm_dp_desc desc = { 0 };
>

This seems to vary based on compilers.  Maybe a memset would be better.

Alex

> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> Signed-off-by: Shengju Zhang <zhangshengju@...s.chinamobile.com>
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 70c4b7a..4d8d1fd 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -5494,7 +5494,7 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
>  {
>         struct drm_dp_mst_port *immediate_upstream_port;
>         struct drm_dp_mst_port *fec_port;
> -       struct drm_dp_desc desc = { 0 };
> +       struct drm_dp_desc desc = { { { 0 } } };
>         u8 endpoint_fec;
>         u8 endpoint_dsc;
>
> --
> 2.7.4
>
>
>
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> dri-devel@...ts.freedesktop.org
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