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From:   Jani Nikula <jani.nikula@linux.intel.com>
To:     Alex Deucher <alexdeucher@gmail.com>,
        Tang Bin <tangbin@cmss.chinamobile.com>
Cc:     Dave Airlie <airlied@linux.ie>,
        LKML <linux-kernel@vger.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        Shengju Zhang <zhangshengju@cmss.chinamobile.com>
Subject: Re: [PATCH] drm/dp_mst: Fix drm_dp_mst_topology.c selftest compilation warning
In-Reply-To: <CADnq5_MD6LkOEJC-hKKQSAmFAHY7LMZ2WU_ER-ttNrP20AxoQA@mail.gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
References: <20200411141740.14584-1-tangbin@cmss.chinamobile.com> <CADnq5_MD6LkOEJC-hKKQSAmFAHY7LMZ2WU_ER-ttNrP20AxoQA@mail.gmail.com>
Date:   Tue, 14 Apr 2020 14:08:48 +0300
Message-ID: <87imi2miin.fsf@intel.com>
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On Mon, 13 Apr 2020, Alex Deucher <alexdeucher@gmail.com> wrote:
> On Mon, Apr 13, 2020 at 5:29 AM Tang Bin <tangbin@cmss.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.

= {}; will do the trick.

BR,
Jani.


>
> Alex
>
>> Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
>> Signed-off-by: Shengju Zhang <zhangshengju@cmss.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@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> _______________________________________________
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> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Graphics Center