drm/amdgpu: fix potential VM faults

When we allocate new page tables under memory
pressure we should not evict old ones.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed