Description of Problem:

"man swapon" says:
-a All devices marked as ``sw'' swap devices in /etc/fstab are made 
available. Devices that are already running as swap are silently skipped.

However, they are _not_ silently skipped:

# /sbin/swapon -a
swapon: /dev/hde6: Device or resource busy

Since /etc/rc.d/rc.sysinit runs swapon twice, the second time it causes 
unpleasant error messages during startup.

How Reproducible:

Every time.

Steps to Reproduce:
1. Install RedHat 7.1 with a swap partition and without swap files.
2. Boot it.

Actual Results:

An error message appears after "Enabling swap space", followed by [Ok]

Expected Results:

No error message. Actually, "Enabling swap space" is useless too, but 
it's another story.

Additional Information:

Update to mount-2.11b-3 doesn't fix the problem.