Re: [PATCH] [v2] accel: fix CONFIG_DRM dependencies

[Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>]

On 31.01.2023 09:53, Oded Gabbay wrote:
> On Sat, Jan 28, 2023 at 12:15 AM Arnd Bergmann <arnd@kernel.org> wrote:
>>
>> From: Arnd Bergmann <arnd@arndb.de>
>>
>> At the moment, accel drivers can be built-in even with CONFIG_DRM=m,
>> but this causes a link failure:
>>
>> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_dev_init':
>> ivpu_drv.c:(.text+0x1535): undefined reference to `drmm_kmalloc'
>> x86_64-linux-ld: ivpu_drv.c:(.text+0x1562): undefined reference to `drmm_kmalloc'
>> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_remove':
>> ivpu_drv.c:(.text+0x1faa): undefined reference to `drm_dev_unregister'
>> x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_probe':
>> ivpu_drv.c:(.text+0x1fef): undefined reference to `__devm_drm_dev_alloc'
>>
>> The problem is that DRM_ACCEL is a 'bool' symbol symbol, so driver that
>> only depend on DRM_ACCEL but not also on DRM do not see the restriction
>> to =m configs.
>>
>> To ensure that each accel driver has an implied dependency on CONFIG_DRM,
>> enclose the entire Kconfig file in an if/endif check.
>>
>> Fixes: 8bf4889762a8 ("drivers/accel: define kconfig and register a new major")
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>> ---
>> v2: rearrage the DRM dependency rather than requiring DRM to be built-in
>> ---
>>  drivers/accel/Kconfig | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
>> index 834863902e16..c437206aa3f1 100644
>> --- a/drivers/accel/Kconfig
>> +++ b/drivers/accel/Kconfig
>> @@ -6,9 +6,10 @@
>>  # as, but not limited to, Machine-Learning and Deep-Learning acceleration
>>  # devices
>>  #
>> +if DRM
>> +
>>  menuconfig DRM_ACCEL
>>         bool "Compute Acceleration Framework"
>> -       depends on DRM
>>         help
>>           Framework for device drivers of compute acceleration devices, such
>>           as, but not limited to, Machine-Learning and Deep-Learning
>> @@ -25,3 +26,5 @@ menuconfig DRM_ACCEL
>>
>>  source "drivers/accel/habanalabs/Kconfig"
>>  source "drivers/accel/ivpu/Kconfig"
>> +
>> +endif
>> --
>> 2.39.0
>>
> This patch is:
> Reviewed-by: Oded Gabbay <ogabbay@kernel.org>

Applied to drm-misc-next.
Thanks.