- In AcpiOsGetThreadId(), allow for curproc to be NULL on 4-stable systems.   In that case use proc0's pid to return the thread ID. - For 4-stable, use the generic swi taskqueue for ACPI events rather than   implementing our own.
- In AcpiOsGetThreadId(), allow for curproc to be NULL on 4-stable systems.
  In that case use proc0's pid to return the thread ID.
- For 4-stable, use the generic swi taskqueue for ACPI events rather than
  implementing our own.

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