Which comments is unnessary?

[mfidelman@meetinghouse.net (Miles Fidelman)]

Seems to me that every comment there is useful to someone who might come 
along later and try to understand that piece of code, and what it's doing.

Navy wrote:
> Hi,
> Here is a code fragment, which comments is unnessary? I think the all the comments should be remove because the comments should show "What to do rather than "How to do?". Am I right?
>
>
> /************************************************************************
>   * Unit flag definitions for un_flags.
>   ************************************************************************/
> #define UN_ISOPEN	0x0001		/* Device is open		*/
> #define UN_CLOSING	0x0002		/* Line is being closed		*/
> #define UN_IMM		0x0004		/* Service immediately		*/
> #define UN_BUSY		0x0008		/* Some work this channel	*/
> #define UN_BREAKI	0x0010		/* Input break received		*/
> #define UN_PWAIT	0x0020		/* Printer waiting for terminal	*/
> #define UN_TIME		0x0040		/* Waiting on time		*/
> #define UN_EMPTY	0x0080		/* Waiting output queue empty	*/
> #define UN_LOW		0x0100		/* Waiting output low water mark*/
> #define UN_EXCL_OPEN	0x0200		/* Open for exclusive use	*/
> #define UN_WOPEN	0x0400		/* Device waiting for open	*/
> #define UN_WIOCTL	0x0800		/* Device waiting for open	*/
> #define UN_HANGUP	0x8000		/* Carrier lost			*/
>
> struct device;
>
> /************************************************************************
>   * Structure for terminal or printer unit.
>   ************************************************************************/
> struct un_t {
> 	int	magic;		/* Unit Magic Number.			*/
> 	struct	channel_t *un_ch;
> 	ulong	un_time;
> 	uint	un_type;
> 	uint	un_open_count;	/* Counter of opens to port		*/
> 	struct tty_struct *un_tty;/* Pointer to unit tty structure	*/
> 	uint	un_flags;	/* Unit flags				*/
> 	wait_queue_head_t un_flags_wait; /* Place to sleep to wait on unit */
> 	uint	un_dev;		/* Minor device number			*/
> 	struct device *un_sysfs;
> };
>
>
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In practice, there is.   .... Yogi Berra