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Add -h/--help option to display usage information and improve code style. Link: https://lkml.kernel.org/r/20251016054927.138510-1-ye.liu@linux.dev Signed-off-by: Ye Liu <liuye@kylinos.cn> Cc: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>