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Subject: Re: [PATCH] drm/amd/display: fix undefined struct member reference
To:     "Liu, Zhan" <Zhan.Liu@amd.com>, Arnd Bergmann <arnd@arndb.de>,
        "Wentland, Harry" <Harry.Wentland@amd.com>,
        "Li, Sun peng (Leo)" <Sunpeng.Li@amd.com>,
        "Deucher, Alexander" <Alexander.Deucher@amd.com>,
        "Koenig, Christian" <Christian.Koenig@amd.com>,
        "Zhou, David(ChunMing)" <David1.Zhou@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>
Cc:     "Liu, Charlene" <Charlene.Liu@amd.com>,
        "Yang, Eric" <Eric.Yang2@amd.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
        "Cornij, Nikola" <Nikola.Cornij@amd.com>,
        "Laktyushkin, Dmytro" <Dmytro.Laktyushkin@amd.com>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "Lei, Jun" <Jun.Lei@amd.com>,
        "Lakha, Bhawanpreet" <Bhawanpreet.Lakha@amd.com>
References: <20191210203101.2663341-1-arnd@arndb.de>
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From:   "Kazlauskas, Nicholas" <nicholas.kazlauskas@amd.com>
Message-ID: <b552de20-dca5-b5d1-e5e8-4c09bc3fdcb5@amd.com>
Date:   Tue, 10 Dec 2019 15:55:56 -0500
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On 2019-12-10 3:54 p.m., Liu, Zhan wrote:
> 
> 
>> -----Original Message-----
>> From: Arnd Bergmann <arnd@arndb.de>
>> Sent: 2019/December/10, Tuesday 3:31 PM
>> To: Wentland, Harry <Harry.Wentland@amd.com>; Li, Sun peng (Leo)
>> <Sunpeng.Li@amd.com>; Deucher, Alexander
>> <Alexander.Deucher@amd.com>; Koenig, Christian
>> <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
>> <David1.Zhou@amd.com>; David Airlie <airlied@linux.ie>; Daniel Vetter
>> <daniel@ffwll.ch>; Liu, Zhan <Zhan.Liu@amd.com>
>> Cc: Arnd Bergmann <arnd@arndb.de>; Laktyushkin, Dmytro
>> <Dmytro.Laktyushkin@amd.com>; Lakha, Bhawanpreet
>> <Bhawanpreet.Lakha@amd.com>; Lei, Jun <Jun.Lei@amd.com>; Liu,
>> Charlene <Charlene.Liu@amd.com>; Yang, Eric <Eric.Yang2@amd.com>;
>> Cornij, Nikola <Nikola.Cornij@amd.com>; amd-gfx@lists.freedesktop.org;
>> dri-devel@lists.freedesktop.org; linux-kernel@vger.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@arndb.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@amd.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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