https://www.phoronix.com/news/Linux-6.6-x86-microcode
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Linux 6.6 Unconditionally Enables x86 CPU Microcode Loading Support
Among the many changes to land during this first week of the Linux 6.6 cycle were the x86 CPU microcode loader updates that now unconditionally makes that support part of the x86/x86_64 kernel builds.