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acpi(9): Fix memory ordering and completion bugs in notifiers.
1. Guarantee everything which happened before acpi_register_notify
has also happened before the notifier is actually called.
2. On acpi_deregister_notify, don't return until the notifier is
definitely not running any more on any CPU, using
AcpiOsWaitEventsComplete.
1. Guarantee everything which happened before acpi_register_notify
has also happened before the notifier is actually called.
2. On acpi_deregister_notify, don't return until the notifier is
definitely not running any more on any CPU, using
AcpiOsWaitEventsComplete.