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mrmondo
Nice also to see:

  You can do
  cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
  and if you don't have a compiler that supports the retpoline mitigations, you'll get:
  Vulnerable: Minimal generic ASM retpoline
  because only the assembly code (not the C code) will have the retpoline mitigation. So keep that in mind.
Someone
I guess that is phrased incorrectly, and should read ”if this kernel wasn't compiled with a compiler that supports the retpoline mitigations”, as checking whether I have one, even if limited to the boot device, wouldn’t be fast, and quite convoluted to do from the kernel.