/* SPDX-License-Identifier: GPL-2.0 */ struct io_ring_ctx;int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg,			unsigned int eventfd_async);int io_eventfd_unregister(struct io_ring_ctx *ctx); void io_eventfd_signal(struct io_ring_ctx *ctx, bool cqe_event, bool defer);