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Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code. Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> Acked-by: Liviu Dudau <liviu.dudau@arm.com> Tested-by: Carsten Haitzler <carsten.haitzler@foss.arm.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200917123949.101925-1-miaoqinglang@huawei.com