Christophe Leroy [off-list ref] writes:

Le 27/08/2021 à 21:56, Christophe JAILLET a écrit :

quoted

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It has *not* been compile tested because I don't have the needed
configuration or cross-compiler. However, the modification is completely
mechanical and done by coccinelle.

All you need is at https://mirrors.edge.kernel.org/pub/tools/crosstool/

There's also some instructions here for using distro toolchains:

https://github.com/linuxppc/wiki/wiki/Building-powerpc-kernels

cheers