After trials with earlier versions, the Pi and Pi2 updated to Kernel 3.19.3 without too much effort..
Source from here: https://github.com/raspberrypi/linux/tree/rpi-3.19.y
Pidora release 2014 (Raspberry Pi Fedora Remix) Kernel 3.19.3 on an armv6l (ttyAMA0) ........ ]# uname -a Linux rgpi 3.19.3 #1 PREEMPT Fri Mar 27 23:55:44 PDT 2015 armv6l armv6l armv6l GNU/Linux
Fedora release 21 (Twenty One) Kernel 3.19.3-v7 on an armv7l (ttyAMA0) ............. ]# uname -a Linux rgpi2 3.19.3-v7 #1 SMP PREEMPT Sat Mar 28 00:50:19 PDT 2015 armv7l armv7l armv7l GNU/Linux
I also discovered the source of the ‘sluggish’ performance of the Pi2 – I had accidentally put an older version of the boot binaries etc. in the /boot directory, which resulted in only 256MB of total memory!
Robert Gadsdon. March 28, 2015.