Nowaday task->group_leader->mm != task->mm is only possible if a) task is not a group leader and b) task->group_leader->mm == NULL because task->group_leader has already exited using sys_exit().
I don't think that drm/amd tries to detect/nack this case. Signed-off-by: Oleg Nesterov <[email protected]> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 --- drivers/gpu/drm/amd/amdkfd/kfd_process.c | 10 ---------- 2 files changed, 13 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index a0f8ba382b9e..e44f158a11f0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -2551,9 +2551,6 @@ void amdgpu_vm_set_task_info(struct amdgpu_vm *vm) vm->task_info->task.pid = current->pid; get_task_comm(vm->task_info->task.comm, current); - if (current->group_leader->mm != current->mm) - return; - vm->task_info->tgid = current->tgid; get_task_comm(vm->task_info->process_name, current->group_leader); } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index a085faac9fe1..f8ef18a3aa71 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -833,12 +833,6 @@ struct kfd_process *kfd_create_process(struct task_struct *thread) if (!(thread->mm && mmget_not_zero(thread->mm))) return ERR_PTR(-EINVAL); - /* Only the pthreads threading model is supported. */ - if (thread->group_leader->mm != thread->mm) { - mmput(thread->mm); - return ERR_PTR(-EINVAL); - } - /* If the process just called exec(3), it is possible that the * cleanup of the kfd_process (following the release of the mm * of the old process image) is still in the cleanup work queue. @@ -918,10 +912,6 @@ struct kfd_process *kfd_get_process(const struct task_struct *thread) if (!thread->mm) return ERR_PTR(-EINVAL); - /* Only the pthreads threading model is supported. */ - if (thread->group_leader->mm != thread->mm) - return ERR_PTR(-EINVAL); - process = find_process(thread, false); if (!process) return ERR_PTR(-EINVAL); -- 2.52.0
