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The lifecycle of the primary kfd process is tied to the user space program, all secondary kfd process would be destroyed when fd close. Thus only the primary kfd process should process USERPTR memory allocation. Signed-off-by: Zhu Lingshan <lingshan.zhu@amd.com> Reviewed-by: Felix Kuehling <felix.kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>