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In the context of the amdgpu uAPI, the PRT flag is referring only to unmapped pages of a partially resident texture (aka. sparse resource), but not the full resource. Virtual addresses marked with this flag behave as follows: - Reads return zero - Writes are discarded Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>