linux-kernel - Re: linux-next: Tree for Jun 15 (drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu

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Date:   Wed, 15 Jun 2022 13:27:37 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: linux-next: Tree for Jun 15
 (drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c)

Hi--

On 6/15/22 13:13, Alex Deucher wrote:
> On Wed, Jun 15, 2022 at 3:44 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>>
>>
>> On 6/15/22 12:28, Alex Deucher wrote:
>>> On Wed, Jun 15, 2022 at 3:01 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>>>
>>>>
>>>>
>>>> On 6/14/22 23:01, Stephen Rothwell wrote:
>>>>> Hi all,
>>>>>
>>>>> Changes since 20220614:
>>>>>
>>>>
>>>> on i386:
>>>> # CONFIG_DEBUG_FS is not set
>>>>
>>>>
>>>> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function ‘amdgpu_dm_crtc_late_register’:
>>>> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6599:2: error: implicit declaration of function ‘crtc_debugfs_init’; did you mean ‘amdgpu_debugfs_init’? [-Werror=implicit-function-declaration]
>>>>   crtc_debugfs_init(crtc);
>>>>   ^~~~~~~~~~~~~~~~~
>>>>   amdgpu_debugfs_init
>>>>
>>>>
>>>> Full randconfig file is attached.
>>>
>>> I tried building with your config and I can't repro this.  As Harry
>>> noted, that function and the whole secure display feature depend on
>>> debugfs.  It should never be built without CONFIG_DEBUG_FS.  See
>>> drivers/gpu/drm/amd/display/Kconfig:
>>
>> Did you try building with today's linux-next tree?
>> (whatever is in it)
>>
>> I have seen this build error multiple times so it shouldn't
>> be so difficult to repro it.
>>
>>
>>>> config DRM_AMD_SECURE_DISPLAY
>>>>         bool "Enable secure display support"
>>>>         default n
>>>>         depends on DEBUG_FS
>>>>         depends on DRM_AMD_DC_DCN
>>>>         help
>>>>             Choose this option if you want to
>>>>             support secure display
>>>>
>>>>             This option enables the calculation
>>>>             of crc of specific region via debugfs.
>>>>             Cooperate with specific DMCU FW.
>>>
>>> amdgpu_dm_crtc_late_register is guarded by
>>> CONIG_DRM_AMD_SECURE_DISPLAY.  It's not clear to me how we could hit
>>> this.
>

I was just about to ask what the paragraph above means.
It was confusing to say the least.
 
> I was able to repro it.  In linux-next the
> CONFIG_DRM_AMD_SECURE_DISPLAY ifdefs in
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c seem to be missing.
> I guess they were lost when the amdgpu branch was merged into
> linux-next.  The attached patch restores the
> CONFIG_DRM_AMD_SECURE_DISPLAY protections.

OK, that builds for me.

Thanks.

-- 
~Randy