undefined reference to `dhd_smmu_fault_handler'

Compiles to the end and gives this error:
```
drivers/iommu/exynos-pcie-iommu.o: In function `exynos_sysmmu_irq':
/home/user/Android/s10/samsung-exynos9820-cruel-HVJ5-v5.3/drivers/iommu/exynos-pcie-iommu.c:458: undefined reference to `dhd_smmu_fault_handler'
make: *** [Makefile:1238: vmlinux] Error 1
```
cruel-HVJ5-v5.3
Any ideas?