Steps in upgrading Linux kernel 2.6.7 to 64 bit kernel

[linas]

On Mon, Nov 14, 2005 at 03:25:56PM +0530, Vijayakumar Ramalingam was heard to remark:
> Hi all,
>  I want to build a 64 bit ppc kernel from 32 bit ppc-linux kernel 2.6.7
>   I want to know how it can be done & what else to be taken care?

Wouldn't it make more sense to build a 64-bit kernel from the 64-bit
sources from a recent kernel? for example, 2.6.14 ??

--linas