serial_core: Move sysrq functions from header file

It's not worth to have them in every serial driver and I'm about to add
another helper function.
Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20200109215444.95995-2-dima@arista.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/serial_core.c

@@ -3082,6 +3082,89 @@ void uart_insert_char(struct uart_port *port, unsigned int status,
 }
 EXPORT_SYMBOL_GPL(uart_insert_char);
 
+int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
+{
+	if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
+		return 0;
+
+	if (!port->has_sysrq || !port->sysrq)
+		return 0;
+
+	if (ch && time_before(jiffies, port->sysrq)) {
+		handle_sysrq(ch);
+		port->sysrq = 0;
+		return 1;
+	}
+	port->sysrq = 0;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uart_handle_sysrq_char);
+
+int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
+{
+	if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
+		return 0;
+
+	if (!port->has_sysrq || !port->sysrq)
+		return 0;
+
+	if (ch && time_before(jiffies, port->sysrq)) {
+		port->sysrq_ch = ch;
+		port->sysrq = 0;
+		return 1;
+	}
+	port->sysrq = 0;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char);
+
+void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
+{
+	int sysrq_ch;
+
+	if (!port->has_sysrq) {
+		spin_unlock_irqrestore(&port->lock, irqflags);
+		return;
+	}
+
+	sysrq_ch = port->sysrq_ch;
+	port->sysrq_ch = 0;
+
+	spin_unlock_irqrestore(&port->lock, irqflags);
+
+	if (sysrq_ch)
+		handle_sysrq(sysrq_ch);
+}
+EXPORT_SYMBOL_GPL(uart_unlock_and_check_sysrq);
+
+/*
+ * We do the SysRQ and SAK checking like this...
+ */
+int uart_handle_break(struct uart_port *port)
+{
+	struct uart_state *state = port->state;
+
+	if (port->handle_break)
+		port->handle_break(port);
+
+	if (port->has_sysrq) {
+		if (port->cons && port->cons->index == port->line) {
+			if (!port->sysrq) {
+				port->sysrq = jiffies + HZ*5;
+				return 1;
+			}
+			port->sysrq = 0;
+		}
+	}
+
+	if (port->flags & UPF_SAK)
+		do_SAK(state->port.tty);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uart_handle_break);
+
 EXPORT_SYMBOL(uart_write_wakeup);
 EXPORT_SYMBOL(uart_register_driver);
 EXPORT_SYMBOL(uart_unregister_driver);

include/linux/serial_core.h

@@ -460,85 +460,11 @@ extern void uart_handle_cts_change(struct uart_port *uport,
 extern void uart_insert_char(struct uart_port *port, unsigned int status,
 		 unsigned int overrun, unsigned int ch, unsigned int flag);
 
-static inline int
-uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
-{
-	if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
-		return 0;
-
-	if (!port->has_sysrq || !port->sysrq)
-		return 0;
-
-	if (ch && time_before(jiffies, port->sysrq)) {
-		handle_sysrq(ch);
-		port->sysrq = 0;
-		return 1;
-	}
-	port->sysrq = 0;
-
-	return 0;
-}
-static inline int
-uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
-{
-	if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL))
-		return 0;
-
-	if (!port->has_sysrq || !port->sysrq)
-		return 0;
-
-	if (ch && time_before(jiffies, port->sysrq)) {
-		port->sysrq_ch = ch;
-		port->sysrq = 0;
-		return 1;
-	}
-	port->sysrq = 0;
-
-	return 0;
-}
-static inline void
-uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
-{
-	int sysrq_ch;
-
-	if (!port->has_sysrq) {
-		spin_unlock_irqrestore(&port->lock, irqflags);
-		return;
-	}
-
-	sysrq_ch = port->sysrq_ch;
-	port->sysrq_ch = 0;
-
-	spin_unlock_irqrestore(&port->lock, irqflags);
-
-	if (sysrq_ch)
-		handle_sysrq(sysrq_ch);
-}
-
-/*
- * We do the SysRQ and SAK checking like this...
- */
-static inline int uart_handle_break(struct uart_port *port)
-{
-	struct uart_state *state = port->state;
-
-	if (port->handle_break)
-		port->handle_break(port);
-
-	if (port->has_sysrq) {
-		if (port->cons && port->cons->index == port->line) {
-			if (!port->sysrq) {
-				port->sysrq = jiffies + HZ*5;
-				return 1;
-			}
-			port->sysrq = 0;
-		}
-	}
-
-	if (port->flags & UPF_SAK)
-		do_SAK(state->port.tty);
-	return 0;
-}
+extern int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch);
+extern int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch);
+extern void uart_unlock_and_check_sysrq(struct uart_port *port,
+					unsigned long irqflags);
+extern int uart_handle_break(struct uart_port *port);
 
 /*
  *	UART_ENABLE_MS - determine if port should enable modem status irqs