1 Feb
2021
1 Feb
'21
9:05 a.m.
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.