> +struct hdlc_header {
quoted text
> +	u8 address;
> +	u8 control;
> +	__be16 protocol;
> +} __attribute__ ((packed));
> +
> +struct cp_header {
> +	u8 code;
> +	u8 id;
> +	__be16 len;
> +} __attribute__ ((packed));
> +

If I remember correctly, the packed is unnecessary for structures like this
and causes GCC to generate worse code.
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