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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/rpmsg/rpmsg_core.c
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@@ -319,6 +319,29 @@
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 }
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 EXPORT_SYMBOL(rpmsg_set_signals);
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+#ifdef CONFIG_NO_GKI
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+/**
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+ * rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
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+ * @ept: the rpmsg endpoint
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+ *
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+ * This function returns maximum buffer size available for a single outgoing message.
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+ *
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+ * Return: the maximum transmission size on success and an appropriate error
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+ * value on failure.
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+ */
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+
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+ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
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+{
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+	if (WARN_ON(!ept))
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+		return -EINVAL;
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+	if (!ept->ops->get_mtu)
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+		return -ENOTSUPP;
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+
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+	return ept->ops->get_mtu(ept);
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+}
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+EXPORT_SYMBOL(rpmsg_get_mtu);
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+#endif
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+
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 /*
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  * match a rpmsg channel with a channel info struct.
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  * this is used to make sure we're not creating rpmsg devices for channels