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Swapping a ttm object which has no backend pages makes no sense. Suggested-by: Christian König <christian.koenig@amd.com> Signed-off-by: xinhui pan <xinhui.pan@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210521083112.33176-1-xinhui.pan@amd.com CC: stable@kernel.org Signed-off-by: Christian König <christian.koenig@amd.com>