yes IBM provided asm for s390 hton ntoh, and "all we had to do" for mainframe Linux was patch x86 only packages to use hton ntoh when they persisted binary data

yes IBM provided asm for s390 hton ntoh, and "all we had to do" for mainframe Linux was patch x86 only packages to use hton ntoh when they persisted binary data. for the kernel IBM did it on their own, contributing mainline, for userland suse did it, grabbing some patches from japanese turbolinux, and then red hat grabbed the patches from turbo and suse, and together we got them mainline lol. and PPC then just piggybacked on top of that effort.