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This takes the eventfd emulation code from the main loop. When the
EventNotifier is used for the main loop too, we need this compatibility
code.
Without CONFIG_EVENTFD, event_notifier_get_fd is only usable for the
"read" side of the notifier, for example to set a select() handler.
The return value of event_notifier_set changes to the cleaner 0/-errno.
No caller is actually checking the return value.
Reviewed-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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