AMDGPU_PTE_READABLE
flags |= AMDGPU_PTE_READABLE;
AMDGPU_PTE_READABLE | AMDGPU_PTE_WRITEABLE |
if (!(mapping->flags & AMDGPU_PTE_READABLE))
flags &= ~AMDGPU_PTE_READABLE;
| AMDGPU_PTE_READABLE \
pte_flag |= AMDGPU_PTE_READABLE;
pte_flag |= AMDGPU_PTE_READABLE;
pte_flag |= AMDGPU_PTE_READABLE;