2.4.0-pre able to mount SHM twice

This is probably due to the source being 'none', but the shm mount point can be mounted twice at the same mount point.

Shouldn't mount(2) return -EBUSY in this case?

# cat /etc/mtab
/dev/hda4 / ext2 rw,errors=remount-ro,errors=remount-ro 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /boot ext2 rw 0 0
/dev/hda3 /mnt/win vfat rw 0 0
none /proc/bus/usb usbdevfs rw 0 0

# mount /dev/shm
# cat /etc/mtab
/dev/hda4 / ext2 rw,errors=remount-ro,errors=remount-ro 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /boot ext2 rw 0 0
/dev/hda3 /mnt/win vfat rw 0 0
none /proc/bus/usb usbdevfs rw 0 0
none /dev/shm shm rw 0 0

# mount /dev/shm
# cat /etc/mtab
/dev/hda4 / ext2 rw,errors=remount-ro,errors=remount-ro 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /boot ext2 rw 0 0
/dev/hda3 /mnt/win vfat rw 0 0
none /proc/bus/usb usbdevfs rw 0 0
none /dev/shm shm rw 0 0
none /dev/shm shm rw 0 0

# umount /dev/shm
# cat /etc/mtab
/dev/hda4 / ext2 rw,errors=remount-ro,errors=remount-ro 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /boot ext2 rw 0 0
/dev/hda3 /mnt/win vfat rw 0 0
none /proc/bus/usb usbdevfs rw 0 0

Jordan
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