cperciva
65e2f94603
MFC r277318:
...
When disabling C3+ CPU states due to the CPU_QUIRK_NO_C3 quirk, don't
accidentally enable non-existent states.
This bug was triggered if ACPI advertises the presence of a C2 state
which we fail to parse via acpi_PkgGas due to our lack of support for
FFixedHW resources, and causes an immediate panic when an attempt is
made to enter the (NULL) state.
One affected platform is the EC2 c4.8xlarge VM instance type; there
may be others.
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