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Linux 6.18 Landing Patch For Old AMD Bulldozer CPUs With XOP Instruction Set
The Linux 6.18 kernel is bringing a new patch to benefit those using the decade-old AMD Bulldozer processors and wanting to make use of Linux's X86_NATIVE_CPU build option for enhancing performance in some areas by optimizing the kernel build for your particular processor/ISA capabilities.
Ultimately the errors came down to the XOP instruction set supported by AMD Bulldozer processors. Google engineer Masami Hiramatsu authored a patch to add support for decoding the AMD XOP prefix encoded instructions:"Support decoding AMD's XOP prefix encoded instructions. In turn with Linux 6.18 you will be able to happily build a X86_NATIVE_CPU kernel on AMD Bulldozer systems without issue.
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