The Silent Kernel Platform War?

iJosh asks: "Recently I decided to be hip and cool and update to the latest Linux Kernel (v2.4.1). Since this decision I've downloaded and tried to compile the offical source from Linus and crew on my PowerMac 7300 only to run into errors for the PowerMac PCI controller. I took this up with Paul Mackerras maintainer of the PPC kernel and his response was quite interesting to say the least and it got me thinking. He basically says that Linus is ignoring the patches from the people working on the PPC side of the kernel, and that they are keeping their own tree so people are not stranded out in the dust with kernels that will not work. My question really comes down to this: Is the linux kernel forking away from PowerPPC? Is this happening because of issues regarding OS X and the possibility of many users jumping ship, away from LinuxPPC upon release? Or is this some kind of quiet platform war from the major kernel developers?"