linux-kernel - Re: [PATCH] drm/amd/display: fix undefined struct member reference

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Date:   Tue, 10 Dec 2019 15:55:56 -0500
From:   "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>
To:     "Liu, Zhan" <Zhan.Liu@....com>, Arnd Bergmann <arnd@...db.de>,
        "Wentland, Harry" <Harry.Wentland@....com>,
        "Li, Sun peng (Leo)" <Sunpeng.Li@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     "Liu, Charlene" <Charlene.Liu@....com>,
        "Yang, Eric" <Eric.Yang2@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "Cornij, Nikola" <Nikola.Cornij@....com>,
        "Laktyushkin, Dmytro" <Dmytro.Laktyushkin@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "Lei, Jun" <Jun.Lei@....com>,
        "Lakha, Bhawanpreet" <Bhawanpreet.Lakha@....com>
Subject: Re: [PATCH] drm/amd/display: fix undefined struct member reference

On 2019-12-10 3:54 p.m., Liu, Zhan wrote:
> 
> 
>> -----Original Message-----
>> From: Arnd Bergmann <arnd@...db.de>
>> Sent: 2019/December/10, Tuesday 3:31 PM
>> To: Wentland, Harry <Harry.Wentland@....com>; Li, Sun peng (Leo)
>> <Sunpeng.Li@....com>; Deucher, Alexander
>> <Alexander.Deucher@....com>; Koenig, Christian
>> <Christian.Koenig@....com>; Zhou, David(ChunMing)
>> <David1.Zhou@....com>; David Airlie <airlied@...ux.ie>; Daniel Vetter
>> <daniel@...ll.ch>; Liu, Zhan <Zhan.Liu@....com>
>> Cc: Arnd Bergmann <arnd@...db.de>; Laktyushkin, Dmytro
>> <Dmytro.Laktyushkin@....com>; Lakha, Bhawanpreet
>> <Bhawanpreet.Lakha@....com>; Lei, Jun <Jun.Lei@....com>; Liu,
>> Charlene <Charlene.Liu@....com>; Yang, Eric <Eric.Yang2@....com>;
>> Cornij, Nikola <Nikola.Cornij@....com>; amd-gfx@...ts.freedesktop.org;
>> dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org
>> Subject: [PATCH] drm/amd/display: fix undefined struct member reference
>>
>> An initialization was added for two optional struct members.  One of these is
>> always present in the dcn20_resource file, but the other one depends on
>> CONFIG_DRM_AMD_DC_DSC_SUPPORT and causes a build failure if that is
>> missing:
>>
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_resource.c:926:1
>> 4: error: excess elements in struct initializer [-Werror]
>>     .num_dsc = 5,
>>
>> Add another #ifdef around the assignment.
>>
>> Fixes: c3d03c5a196f ("drm/amd/display: Include num_vmid and num_dsc
>> within NV14's resource caps")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Thank you for catching that 😊 On my side I kept that flag enabled all the time, so I didn't realize there was a warning hidden here.
> 
> Reviewed-by: Zhan Liu <zhan.liu@....com>

What tree is this reported on?

We dropped this flag whenever building DCN. Sounds like we're missing a 
patch if you're getting this.

So this is a NAK from me for going into amd-staging-drm-next at least.

Nicholas Kazlauskas

> 
>> ---
>>   drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
>> b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
>> index faab89d1e694..fdf93e6edf43 100644
>> --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
>> +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
>> @@ -923,7 +923,9 @@ static const struct resource_caps res_cap_nv14 = {
>>   		.num_dwb = 1,
>>   		.num_ddc = 5,
>>   		.num_vmid = 16,
>> +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
>>   		.num_dsc = 5,
>> +#endif
>>   };
>>
>>   static const struct dc_debug_options debug_defaults_drv = {
>> --
>> 2.20.0
> 
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> dri-devel@...ts.freedesktop.org
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