Linux 7.4 Adding New Emulation Function While Some Old CPUs May Soon Be Phased Out

T2Covered by 1 source · first reported by Phoronix at 20 Oct, 10:32 UTC

Linux 7.4 is seeing a new emulation function added for cmpxchg() for compare and exchange. This is being done so that two-byte cmpxchg() can be used in common Linux kernel code that is already natively supported on newer CPU architectures. The pull request notes though that some old CPU…