Question Regarding Kernal Flashing

Hi,

I am a noob in android stuff, so was going through all this forum for a while (around 1 month).

I had unlocked my bootloader for sony xperia neo V.

People say of flashing kernal before you put ROM into Device

is it neccessary ??

I Right i have got cm-9.1.0-haida and wish to use it on my Neo..

and my current build for phone is
2.6.32.9-perf kernal &&
4.1.B.0.587

should a kernal flash be required ??

shall i put cm9.1 through cWM recovery mode ?? via update