this post was submitted on 26 Apr 2025
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[–] [email protected] 13 points 1 day ago* (last edited 1 day ago) (18 children)

The patch series today though would end support for original i486 processors as well as early i586 processors. The kernel patches would remove support for CPUs lacking TSC and CX8/CMPXCHG8B capabilities. Basically this would put the minimum upstream Linux kernel support for 32-bit processors at the original Pentium CPU with CMPXCHG8B and Time Stamp Counter (TSC) support.

There were 586 CPUs that were not Pentiums? Article implies the original Pentium would be the new baseline, but then what 586 CPUs would lose support?

[–] [email protected] 8 points 1 day ago (2 children)

There were 586 CPU that were not Pentiums?

There were a lot of Socket 7 CPUs. From VIA/AMD/IBM to a dozen of smaller alternatives I wouldn't be able to recall already.

[–] [email protected] 5 points 1 day ago (1 children)
[–] [email protected] 3 points 1 day ago

That's a name I haven't heard in forever

[–] [email protected] 3 points 1 day ago (1 children)

Ah I see. So all 486 CPUs and early 586 clones with original Pentiums still being supported.

[–] [email protected] 2 points 1 day ago

Well, it doesn't mean anything. They want to drop support for CPUs that lack some capabilities. So which CPUs will stay supported and which not depends on the presence of the needed command set in the CPU.

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