[Wlug] mkinitrd

I'm using mkinitrd on a multi-processor system. I have both the single and multi-processor kernels loaded, but I rarely run the single-processor kernel. It's there mostly as a safety net. Question: Do I need to boot to the single-processor kernel in order to make a valid initrd image for a single-processor boot? I would hope that I can, but the man page is not specific about it. (I want to avoid the extra boot cycles.) TIA, Bill