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由 Paolo Bonzini 提交于
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: NAnthony Liguori <anthony@codemonkey.ws> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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