linux-kernel - Re: [PATCH -next] drm/amd/display: Fix old-style declaration

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Date:   Tue, 12 Nov 2019 15:19:02 -0500
From:   Harry Wentland <hwentlan@....com>
To:     Yuehaibing <yuehaibing@...wei.com>, Joe Perches <joe@...ches.com>,
        harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        David1.Zhou@....com, airlied@...ux.ie, daniel@...ll.ch,
        Bhawanpreet.Lakha@....com, Jun.Lei@....com, David.Francis@....com,
        Dmytro.Laktyushkin@....com, nicholas.kazlauskas@....com,
        martin.leung@....com, Chris.Park@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] drm/amd/display: Fix old-style declaration

On 2019-11-12 2:51 a.m., Yuehaibing wrote:
> On 2019/11/12 10:39, Joe Perches wrote:
>> On Mon, 2019-11-11 at 20:28 +0800, YueHaibing wrote:
>>> Fix a build warning:
>>>
>>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:75:1:
>>>  warning: 'static' is not at beginning of declaration [-Wold-style-declaration]
>> []
>>> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
>> []
>>> @@ -69,7 +69,7 @@
>>>  #define DC_LOGGER \
>>>  	dc->ctx->logger
>>>  
>>> -const static char DC_BUILD_ID[] = "production-build";
>>> +static const char DC_BUILD_ID[] = "production-build";
>>
>> DC_BUILD_ID is used exactly once.
>> Maybe just use it directly and remove DC_BUILD_ID instead?
> 
> commit be61df574256ae8c0dbd45ac148ca7260a0483c0
> Author: Jun Lei <Jun.Lei@....com>
> Date:   Thu Sep 13 09:32:26 2018 -0400
> 
>     drm/amd/display: Add DC build_id to determine build type
> 
>     [why]
>     Sometimes there are indications that the incorrect driver is being
>     loaded in automated tests. This change adds the ability for builds to
>     be tagged with a string, and picked up by the test infrastructure.
> 
>     [how]
>     dc.c will allocate const for build id, which is init-ed with default
>     value, indicating production build. For test builds, build server will
>     find/replace this value. The test machine will then verify this value.
> 
> It seems DC_BUILD_ID is used by the build server, so maybe we should keep it.

Thanks, Haibing. Yes, we'll want to keep it for build purposes.

Harry

> 
>>
>> ---
>>  drivers/gpu/drm/amd/display/dc/core/dc.c | 4 +---
>>  1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
>> index 1fdba13..803dc14 100644
>> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
>> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
>> @@ -69,8 +69,6 @@
>>  #define DC_LOGGER \
>>  	dc->ctx->logger
>>  
>> -const static char DC_BUILD_ID[] = "production-build";
>> -
>>  /**
>>   * DOC: Overview
>>   *
>> @@ -815,7 +813,7 @@ struct dc *dc_create(const struct dc_init_data *init_params)
>>  	if (dc->res_pool->dmcu != NULL)
>>  		dc->versions.dmcu_version = dc->res_pool->dmcu->dmcu_version;
>>  
>> -	dc->build_id = DC_BUILD_ID;
>> +	dc->build_id = "production-build";
>>  
>>  	DC_LOG_DC("Display Core initialized\n");
>>  
>>
>>
>>
>> .
>>
>