Remove <linux/genhd.h> from user-visible headers.

It was all wrapped in '#ifdef CONFIG_BLOCK' anyway, so userspace was
getting nothing useful out of it. And the special #ifndef __KERNEL__
version of 'struct partition' makes me inclined to promote an attitude
of violence...

Stick some comments on some of the #endifs too, while we're at it.

Signed-off-by: David Woodhouse <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/Kbuild

···
 unifdef-y += fs.h
 unifdef-y += gameport.h
 unifdef-y += generic_serial.h
-unifdef-y += genhd.h
 unifdef-y += gfs2_ondisk.h
 unifdef-y += hayesesp.h
 unifdef-y += hdlcdrv.h

include/linux/genhd.h

···
 	UNIXWARE_PARTITION = 0x63,	/* Same as GNU_HURD and SCO Unix */
 };
 
-#ifndef __KERNEL__
-
-struct partition {
-	unsigned char boot_ind;		/* 0x80 - active */
-	unsigned char head;		/* starting head */
-	unsigned char sector;		/* starting sector */
-	unsigned char cyl;		/* starting cylinder */
-	unsigned char sys_ind;		/* What partition type */
-	unsigned char end_head;		/* end head */
-	unsigned char end_sector;	/* end sector */
-	unsigned char end_cyl;		/* end cylinder */
-	unsigned int start_sect;	/* starting sector counting from 0 */
-	unsigned int nr_sects;		/* nr of sectors in partition */
-} __attribute__((packed));
-
-#endif
-
-#ifdef __KERNEL__
 #include <linux/major.h>
 #include <linux/device.h>
 #include <linux/smp.h>
···
 		       sizeof(struct disk_stats));
 }
 				
-#else
+#else /* !CONFIG_SMP */
 #define __disk_stat_add(gendiskp, field, addnd) \
 				(gendiskp->dkstats.field += addnd)
 #define disk_stat_read(gendiskp, field)	(gendiskp->dkstats.field)
···
 	memset(&part->dkstats, value, sizeof(struct disk_stats));
 }
 
-#endif
+#endif /* CONFIG_SMP */
 
 #define disk_stat_add(gendiskp, field, addnd)			\
 	do {							\
···
 {
 	disk->capacity = size;
 }
-
-#endif  /*  __KERNEL__  */
 
 #ifdef CONFIG_SOLARIS_X86_PARTITION
 
···
 #   define MINIX_NR_SUBPARTITIONS  4
 #endif /* CONFIG_MINIX_SUBPARTITION */
 
-#ifdef __KERNEL__
-
 #define ADDPART_FLAG_NONE	0
 #define ADDPART_FLAG_RAID	1
 #define ADDPART_FLAG_WHOLEDISK	2
···
 	return bdget(MKDEV(disk->major, disk->first_minor) + index);
 }
 
-#endif
-
 #else /* CONFIG_BLOCK */
 
 static inline void printk_all_partitions(void) { }
···
 
 #endif /* CONFIG_BLOCK */
 
-#endif
+#endif /* _LINUX_GENHD_H */