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I'm not even sure mainline Linux supports machines this old at this point. The cmpxchg16b instruction isn't that old, and I believe it's required now.


CMPXCHG8B is required as of a month or two ago, not 16B (i.e., the version from the 90's is now required)

See https://lkml.org/lkml/2025/4/25/409


32 bit Linux is still supported by the kernel and Debian, Arch, and Fedora still supports baseline x86_64.

RHEL 8 is still supported and Ubuntu is still baseline x86_64 I believe for commercial distros. Not sure about SuSE.


> 32 bit Linux is still supported by the kernel and Debian

Deprecated for Debian

https://www.debian.org/releases/stable/release-notes/issues....


>> 32 bit Linux is still supported by the kernel and Debian

> Deprecated for Debian

> https://www.debian.org/releases/stable/release-notes/issues....

32 bit Linux is still supported by the kernel... and... 'Debian, Arch, and Fedora still supports baseline x86_64'.

Please do not take things out of context.




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