Re: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver

Re: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver

[kernel test robot]

Hi Ashish,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20251201]
[also build test ERROR on v6.18]
[cannot apply to robh/for-next linus/master v6.18 v6.18-rc7 v6.18-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ashish-Mhetre/iommu-arm-smmu-v3-Add-device-tree-support-for-CMDQV-driver/20251202-003517
base:   next-20251201
patch link:    https://lore.kernel.org/r/20251201163219.3237266-2-amhetre%40nvidia.com
patch subject: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251203/202512031601.IpliwbHW-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251203/202512031601.IpliwbHW-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512031601.IpliwbHW-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: duplicate symbol: init_module
   >>> defined at arm-smmu-v3.c
   >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:(init_module)
   >>> defined at tegra241-cmdqv.c
   >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:(.init.text+0x4)
--
>> ld.lld: error: duplicate symbol: cleanup_module
   >>> defined at arm-smmu-v3.c
   >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:(cleanup_module)
   >>> defined at tegra241-cmdqv.c
   >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:(.exit.text+0x4)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver

[Ashish Mhetre]

On 12/3/2025 2:05 PM, kernel test robot wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Ashish,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on next-20251201]
> [also build test ERROR on v6.18]
> [cannot apply to robh/for-next linus/master v6.18 v6.18-rc7 v6.18-rc6]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Ashish-Mhetre/iommu-arm-smmu-v3-Add-device-tree-support-for-CMDQV-driver/20251202-003517
> base:   next-20251201
> patch link:    https://lore.kernel.org/r/20251201163219.3237266-2-amhetre%40nvidia.com
> patch subject: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver
> config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251203/202512031601.IpliwbHW-lkp@intel.com/config)
> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251203/202512031601.IpliwbHW-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202512031601.IpliwbHW-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>>> ld.lld: error: duplicate symbol: init_module
>     >>> defined at arm-smmu-v3.c
>     >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:(init_module)
>     >>> defined at tegra241-cmdqv.c
>     >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:(.init.text+0x4)
> --
>>> ld.lld: error: duplicate symbol: cleanup_module
>     >>> defined at arm-smmu-v3.c
>     >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:(cleanup_module)
>     >>> defined at tegra241-cmdqv.c
>     >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:(.exit.text+0x4)

Hi Nic, Robin,

How do you suggest fixing this? Is it fine to compile tegra241-cmdqv as 
separate module
and export tegra241_cmdqv_probe() to fix this warning?
I am using GCC compiler and was not able to reproduce this with W=1 build.

Thanks,
Ashish Mhetre

> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

Re: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver

[Robin Murphy]

On 2025-12-03 11:04 am, Ashish Mhetre wrote:
> 
> On 12/3/2025 2:05 PM, kernel test robot wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> Hi Ashish,
>>
>> kernel test robot noticed the following build errors:
>>
>> [auto build test ERROR on next-20251201]
>> [also build test ERROR on v6.18]
>> [cannot apply to robh/for-next linus/master v6.18 v6.18-rc7 v6.18-rc6]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>
>> url:    https://github.com/intel-lab-lkp/linux/commits/Ashish-Mhetre/ 
>> iommu-arm-smmu-v3-Add-device-tree-support-for-CMDQV- 
>> driver/20251202-003517
>> base:   next-20251201
>> patch link:    https://lore.kernel.org/r/20251201163219.3237266-2- 
>> amhetre%40nvidia.com
>> patch subject: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree 
>> support for CMDQV driver
>> config: arm64-allmodconfig (https://download.01.org/0day-ci/ 
>> archive/20251203/202512031601.IpliwbHW-lkp@intel.com/config)
>> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project 
>> cd708029e0b2869e80abe31ddb175f7c35361f90)
>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/ 
>> archive/20251203/202512031601.IpliwbHW-lkp@intel.com/reproduce)
>>
>> If you fix the issue in a separate patch/commit (i.e. not just a new 
>> version of
>> the same patch/commit), kindly add following tags
>> | Reported-by: kernel test robot <lkp@intel.com>
>> | Closes: https://lore.kernel.org/oe-kbuild-all/202512031601.IpliwbHW- 
>> lkp@intel.com/
>>
>> All errors (new ones prefixed by >>):
>>
>>>> ld.lld: error: duplicate symbol: init_module
>>     >>> defined at arm-smmu-v3.c
>>     >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o: 
>> (init_module)
>>     >>> defined at tegra241-cmdqv.c
>>     >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o: 
>> (.init.text+0x4)
>> -- 
>>>> ld.lld: error: duplicate symbol: cleanup_module
>>     >>> defined at arm-smmu-v3.c
>>     >>>            drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o: 
>> (cleanup_module)
>>     >>> defined at tegra241-cmdqv.c
>>     >>>            drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o: 
>> (.exit.text+0x4)
> 
> Hi Nic, Robin,
> 
> How do you suggest fixing this? Is it fine to compile tegra241-cmdqv as 
> separate module
> and export tegra241_cmdqv_probe() to fix this warning?

As Jon just pointed out, the issue is using module_platform_driver(), 
which is unnecessary anyway since this is not a driver; nor is it even a 
module, it's just some extra code that can be included in the 
arm_smmu_v3 driver, and will be integral to the arm_smmu_v3.ko module if 
built as a such.

You could sanity-check the compatible of the phandle target in 
tegra_cmdqv_dt_probe() if you feel like you should do more than just 
blindly trust the DT, but either way trying to register a dummy platform 
driver that won't bind to anything is pointless.

> I am using GCC compiler and was not able to reproduce this with W=1 build.

This will be happening with CONFIG_ARM_SMMU_V3=m.

Thanks,
Robin.

> 
> Thanks,
> Ashish Mhetre
> 
>> -- 
>> 0-DAY CI Kernel Test Service
>> https://github.com/intel/lkp-tests/wiki

Re: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver

[Ashish Mhetre]

On 12/3/2025 9:19 PM, Robin Murphy wrote:
> External email: Use caution opening links or attachments
>
>
> On 2025-12-03 11:04 am, Ashish Mhetre wrote:
>>
>> On 12/3/2025 2:05 PM, kernel test robot wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> Hi Ashish,
>>>
>>> kernel test robot noticed the following build errors:
>>>
>>> [auto build test ERROR on next-20251201]
>>> [also build test ERROR on v6.18]
>>> [cannot apply to robh/for-next linus/master v6.18 v6.18-rc7 v6.18-rc6]
>>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>>> And when submitting patch, we suggest to use '--base' as documented in
>>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>>
>>> url: https://github.com/intel-lab-lkp/linux/commits/Ashish-Mhetre/
>>> iommu-arm-smmu-v3-Add-device-tree-support-for-CMDQV-
>>> driver/20251202-003517
>>> base:   next-20251201
>>> patch link: https://lore.kernel.org/r/20251201163219.3237266-2-
>>> amhetre%40nvidia.com
>>> patch subject: [PATCH V3 1/3] iommu/arm-smmu-v3: Add device-tree
>>> support for CMDQV driver
>>> config: arm64-allmodconfig (https://download.01.org/0day-ci/
>>> archive/20251203/202512031601.IpliwbHW-lkp@intel.com/config)
>>> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project
>>> cd708029e0b2869e80abe31ddb175f7c35361f90)
>>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/
>>> archive/20251203/202512031601.IpliwbHW-lkp@intel.com/reproduce)
>>>
>>> If you fix the issue in a separate patch/commit (i.e. not just a new
>>> version of
>>> the same patch/commit), kindly add following tags
>>> | Reported-by: kernel test robot <lkp@intel.com>
>>> | Closes: https://lore.kernel.org/oe-kbuild-all/202512031601.IpliwbHW-
>>> lkp@intel.com/
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>>> ld.lld: error: duplicate symbol: init_module
>>>     >>> defined at arm-smmu-v3.c
>>>     >>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:
>>> (init_module)
>>>     >>> defined at tegra241-cmdqv.c
>>>     >>> drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:
>>> (.init.text+0x4)
>>> -- 
>>>>> ld.lld: error: duplicate symbol: cleanup_module
>>>     >>> defined at arm-smmu-v3.c
>>>     >>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o:
>>> (cleanup_module)
>>>     >>> defined at tegra241-cmdqv.c
>>>     >>> drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.o:
>>> (.exit.text+0x4)
>>
>> Hi Nic, Robin,
>>
>> How do you suggest fixing this? Is it fine to compile tegra241-cmdqv as
>> separate module
>> and export tegra241_cmdqv_probe() to fix this warning?
>
> As Jon just pointed out, the issue is using module_platform_driver(),
> which is unnecessary anyway since this is not a driver; nor is it even a
> module, it's just some extra code that can be included in the
> arm_smmu_v3 driver, and will be integral to the arm_smmu_v3.ko module if
> built as a such.
>
> You could sanity-check the compatible of the phandle target in
> tegra_cmdqv_dt_probe() if you feel like you should do more than just
> blindly trust the DT, but either way trying to register a dummy platform
> driver that won't bind to anything is pointless.
>

Thanks for the pointers Jon, Robin. I agree that this part of code is
redundant and can be removed. I will make these changes in next version.

>> I am using GCC compiler and was not able to reproduce this with W=1 
>> build.
>
> This will be happening with CONFIG_ARM_SMMU_V3=m.
>
> Thanks,
> Robin.
>
>>
>> Thanks,
>> Ashish Mhetre
>>
>>> -- 
>>> 0-DAY CI Kernel Test Service
>>> https://github.com/intel/lkp-tests/wiki
>