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Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code. Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com> Link: https://lore.kernel.org/r/20220923102554.2443452-1-chenxiaosong2@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>