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Fall back to drm_exec_lock_obj() if num_fences is zero for the drm_gpuvm_prepare_* function family. Otherwise dma_resv_reserve_fences() would actually allocate slots even though num_fences is zero. Cc: Christian König <christian.koenig@amd.com> Acked-by: Donald Robson <donald.robson@imgtec.com> Signed-off-by: Danilo Krummrich <dakr@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231129220835.297885-2-dakr@redhat.com