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OPAL_UNREGISTER_DUMP_REGION
===========================
While OPAL_REGISTER_DUMP_REGION registers a region, OPAL_UNREGISTER_DUMP_REGION
will unregister a region by region ID.
OPAL_UNREGISTER_DUMP_REGION takes one argument: the region ID.
A host OS should check OPAL_UNREGISTER_DUMP_REGION is supported through a call to
OPAL_CHECK_TOKEN.
If OPAL_UNREGISTER_DUMP_REGION is called on a system where the call is present but
unsupported, it will return OPAL_UNSUPPORTED.
BUGS
----
Some skiboot versions incorrectly returned OPAL_SUCCESS in the case of
OPAL_UNREGISTER_DUMP_REGION being supported on a platform (so the call was present)
but the call being unsupported for some reason (e.g. on an IBM POWER7 machine).
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