add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rpmsg/rpmsg_internal.h
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@@ -50,6 +50,7 @@
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  * @poll:		see @rpmsg_poll(), optional
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  * @get_signals:	see @rpmsg_get_signals(), optional
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  * @set_signals:	see @rpmsg_set_signals(), optional
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+ * @get_mtu:		see @rpmsg_get_mtu(), optional
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  *
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  * Indirection table for the operations that a rpmsg backend should implement.
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  * In addition to @destroy_ept, the backend must at least implement @send and
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@@ -71,6 +72,9 @@
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 			     poll_table *wait);
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 	int (*get_signals)(struct rpmsg_endpoint *ept);
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 	int (*set_signals)(struct rpmsg_endpoint *ept, u32 set, u32 clear);
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+#ifdef CONFIG_NO_GKI
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+	ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
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+#endif
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 };
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 int rpmsg_register_device(struct rpmsg_device *rpdev);