kernel/drivers/gpu/drm/msm/msm_iommu.c
.. .. @@ -154,7 +154,12 @@ 154 154 /* Get the pagetable configuration from the domain */ 155 155 if (adreno_smmu->cookie) 156 156 ttbr1_cfg = adreno_smmu->get_ttbr1_cfg(adreno_smmu->cookie); 157 - if (!ttbr1_cfg)157 +158 + /*159 + * If you hit this WARN_ONCE() you are probably missing an entry in160 + * qcom_smmu_impl_of_match[] in arm-smmu-qcom.c161 + */162 + if (WARN_ONCE(!ttbr1_cfg, "No per-process page tables"))158 163 return ERR_PTR(-ENODEV); 159 164 160 165 pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);