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Each zone-device page holds a reference to the SVM BO that manages its backing storage. This is necessary to correctly hold on to the BO in case zone_device pages are shared with a child-process. Signed-off-by: Alex Sierra <alex.sierra@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>