On Sun, Jan 31, 2021 at 09:24:32AM -0800, Andy Lutomirski wrote: > While we're at it, disable the workaround on all CPUs except AMD Family > 0xF. By my reading of the Revision Guide for AMD Athlon™ 64 and AMD > Opteron™ Processors, only family 0xF is affected. I think it would be better to have one no risk refression fix that just probes both user and kernel addresses and a separate one to restrict the workaround. > + if (likely(boot_cpu_data.x86_vendor != X86_VENDOR_AMD > + || boot_cpu_data.x86 != 0xf)) Normally kernel style would be to have the || on the first line.
