Re: [PATCH v4 0/3] soc: qcom: ubwc: Fix link error

[Daniel Baluta <daniel.baluta@oss.nxp.com>]

On 8/14/26 02:23, Nathan Chancellor wrote:
> [You don't often get email from nathan@kernel.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> Hi Daniel,
> 
> On Wed, Aug 12, 2026 at 06:19:31PM +0300, Daniel Baluta wrote:
>> Fix link error caused by the fact that drivers/soc/qcom/ubwc_config.c
>> enabled via QCOM_UBWC_CONFIG uses unconditionally symbols from
>> drivers/soc/qcom/smem.c enabled via CONFIG_QCOM_SMEM.
>>
>> Changes since v3:
>> - fix issues pointed by sashiko https://sashiko.dev/#/patchset/20260812130421.670527-1-daniel.baluta%40nxp.com
>>  - add new patches 2/3 in order to fix unmet dependcy for VIDEO_QCOM_IRIS
>>  - Use IS_REACHABLE instead of IS_ENABLED to avoid the situation we use
>>    some symbols in builtin kernel but their definitions sits in a
>> module.
>>
>> Remark for Dmitry, at this point I think v1 would have been a better
>> option.
>> Link to v1:
>> -     https://lore.kernel.org/imx/1521da8e-18df-4d7b-a255-5ca133bd5ccc@oss.nxp.com/T/#t
>>
>>
>>
>> Daniel Baluta (3):
>>   soc: qcom: ubwc: Fix link error when QCOM_SMEM=n
>>   media: iris: Fix unmet dependency when QCOM_SMEM=n
> 
> I think this patch should come first since you introduce the QCOM_SMEM
> dependency that requires this change in the first patch, which could
> mess with bisects. I would personally add the 'if' condition to the
> 'select QCOM_UBWC_CONFIG' statements in one patch then add the QCOM_SMEM
> dependency to QCOM_UBWC_CONFIG in a separate patch.
> 
>>   soc: qcom: ubwc: Use IS_REACHABLE() instead of IS_ENABLED()
> 
> Even with this series applied, I see
> 
>   $ cat allno.config
>   CONFIG_ARCH_MULTI_V7=y
>   CONFIG_ARCH_QCOM=y
>   CONFIG_DRM=y
>   CONFIG_DRM_MSM=y
>   CONFIG_DRM_MSM_DPU=y
>   CONFIG_IOMMU_SUPPORT=y
>   CONFIG_MAILBOX=y
>   CONFIG_MMU=y
>   CONFIG_PM=y
>   CONFIG_QCOM_AOSS_QMP=y
>   CONFIG_QCOM_LLCC=y
>   CONFIG_QCOM_OCMEM=y
> 
>   $ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- KCONFIG_ALLCONFIG=1 allnoconfig drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.o
>   In file included from drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c:7:
>   include/linux/soc/qcom/ubwc.h: In function 'qcom_ubwc_config_get_data':
>   include/linux/soc/qcom/ubwc.h:45:16: error: implicit declaration of function 'ERR_PTR' [-Wimplicit-function-declaration]
>      45 |         return ERR_PTR(-EOPNOTSUPP);
>         |                ^~~~~~~
>   include/linux/soc/qcom/ubwc.h:45:25: error: 'EOPNOTSUPP' undeclared (first use in this function)

Hi Nathan,

This issue is pre-existing and I've sent a separate fix for it:

https://lore.kernel.org/all/5fy7l6o5nfzclsmhsqys562xwoilbo4xv3af65kcqugtitgltd@3fw2w443pw2g/#r