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Linux kernel is leaving 486 CPUs behind, only 18 years after the last one made

Ars Technica
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Leaders of the Linux kernel want to leave i486 support behind.

Ingo Molnar submitted a patch series to the 6.15 kernel that updates its minimum support features.

TSC (Time Stamp Counter) and CX8 (i.e., "fixed" CMPXCH8B, its own whole thing) are now required.