intel CPU vulnerability NO_SSB whitelist for AIRMONT

[Shanavas.K.S]

Hi All,
This is in reference to
https://github.com/torvalds/linux/blame/master/arch/x86/kernel/cpu/common.c#L1169.
The whitelist for INTEL_ATOM_AIRMONT has NO_SSB enabled  which means
cache speculation vulnerability(spectre 4,CVE-2018-3639) is not
applicable to  this processor. But NO_SSB is not set for
INTEL_ATOM_AIRMONT_NP and INTEL_ATOM_AIRMONT_MID. Are these settings
missing for AIRMONT_NP and AIRMONT_MID or is there a real difference
between cache speculation between these processors?

regards
Shanavas