DRM_MSM and VIDEO_QCOM_IRIS select QCOM_UBWC_CONFIG, whose
ubwc_config.c calls QCOM_SMEM APIs unconditionally. On configs without
QCOM_SMEM this fails to link, e.g. on SOC_IMX5:

  arm-linux-gnueabihf-ld: ubwc_config.c:(.text+0x2c): undefined
      reference to 'qcom_smem_is_available'

Fix it by making the QCOM_SMEM requirement explicit in Kconfig.

Changes since v5:
 * added patch 4/4 to this series, which was initially sent as a
 standalone patch (addresses review from Nathan)
 * no other change to the series.
 * picked up all R-b and Acked-by tags.

Link to v5: https://lore.kernel.org/imx/20260814141724.1006382-1-daniel.baluta@nxp.com/T/#t

Daniel Baluta (4):
  drm/msm: Guard the QCOM_UBWC_CONFIG select with QCOM_SMEM
  media: iris: Guard the QCOM_UBWC_CONFIG select with QCOM_SMEM
  soc: qcom: ubwc: Fix link error when QCOM_SMEM=n
  soc: qcom: ubwc: Fix missing include

 drivers/gpu/drm/msm/Kconfig              | 3 ++-
 drivers/media/platform/qcom/iris/Kconfig | 3 ++-
 drivers/soc/qcom/Kconfig                 | 1 +
 include/linux/soc/qcom/ubwc.h            | 1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

-- 
2.45.2

On Mon, Aug 17, 2026, at 14:35, Daniel Baluta wrote:
> DRM_MSM and VIDEO_QCOM_IRIS select QCOM_UBWC_CONFIG, whose
> ubwc_config.c calls QCOM_SMEM APIs unconditionally. On configs without
> QCOM_SMEM this fails to link, e.g. on SOC_IMX5:
>
>   arm-linux-gnueabihf-ld: ubwc_config.c:(.text+0x2c): undefined
>       reference to 'qcom_smem_is_available'
>
> Fix it by making the QCOM_SMEM requirement explicit in Kconfig.
>
> Changes since v5:
>  * added patch 4/4 to this series, which was initially sent as a
>  standalone patch (addresses review from Nathan)
>  * no other change to the series.
>  * picked up all R-b and Acked-by tags.
>
> Link to v5: 
> https://lore.kernel.org/imx/20260814141724.1006382-1-daniel.baluta@nxp.com/T/#t

Krzysztof pointed me to this series when I ran into the same problem
during my last minute regression test for the coming merge window.

I've included the four patches as fixups in the soc/drivers branch
now and plan to send this to Linus later today when the regression tests
finish.

Let me know if anyone feels that the patches should go a different way.

    Arnd

Hi Daniel,

On Mon, Aug 17, 2026 at 03:35:37PM +0300, Daniel Baluta wrote:
> DRM_MSM and VIDEO_QCOM_IRIS select QCOM_UBWC_CONFIG, whose
> ubwc_config.c calls QCOM_SMEM APIs unconditionally. On configs without
> QCOM_SMEM this fails to link, e.g. on SOC_IMX5:
> 
>   arm-linux-gnueabihf-ld: ubwc_config.c:(.text+0x2c): undefined
>       reference to 'qcom_smem_is_available'
> 
> Fix it by making the QCOM_SMEM requirement explicit in Kconfig.
> 
> Changes since v5:
>  * added patch 4/4 to this series, which was initially sent as a
>  standalone patch (addresses review from Nathan)
>  * no other change to the series.
>  * picked up all R-b and Acked-by tags.
> 
> Link to v5: https://lore.kernel.org/imx/20260814141724.1006382-1-daniel.baluta@nxp.com/T/#t
> 
> Daniel Baluta (4):
>   drm/msm: Guard the QCOM_UBWC_CONFIG select with QCOM_SMEM
>   media: iris: Guard the QCOM_UBWC_CONFIG select with QCOM_SMEM
>   soc: qcom: ubwc: Fix link error when QCOM_SMEM=n
>   soc: qcom: ubwc: Fix missing include
> 
>  drivers/gpu/drm/msm/Kconfig              | 3 ++-
>  drivers/media/platform/qcom/iris/Kconfig | 3 ++-
>  drivers/soc/qcom/Kconfig                 | 1 +
>  include/linux/soc/qcom/ubwc.h            | 1 +
>  4 files changed, 6 insertions(+), 2 deletions(-)

Thanks, this resolves the build errors that I noticed.

Tested-by: Nathan Chancellor <nathan@kernel.org> # build

-- 
Cheers,
Nathan