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Subject[PATCH] earlycon: Fix uart_parse_earlycon() if !CONFIG_SERIAL_CORE_CONSOLE
Date
Arnd Bergmann wrote:
> A configuration that enables earlycon but not the core console
> code causes a link error:
>
> drivers/built-in.o: In function `setup_earlycon':
> drivers/tty/serial/earlycon.c:70: undefined reference to `uart_parse_earlycon'

CONFIG_SERIAL_EARLYCON should not require CONFIG_SERIAL_CORE_CONSOLE.
Move uart_parse_earlycon() and compile if either CONFIG_SERIAL_CORE_CONSOLE
or CONFIG_SERIAL_EARLYCON.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---

NB: The diff moves everything else around uart_parse_earlycon() :/

drivers/tty/serial/serial_core.c | 90 ++++++++++++++++++++--------------------
1 file changed, 46 insertions(+), 44 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index eec067d..4d42b13 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1762,50 +1762,7 @@ static const struct file_operations uart_proc_fops = {
};
#endif

-#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
-/**
- * uart_console_write - write a console message to a serial port
- * @port: the port to write the message
- * @s: array of characters
- * @count: number of characters in string to write
- * @putchar: function to write character to port
- */
-void uart_console_write(struct uart_port *port, const char *s,
- unsigned int count,
- void (*putchar)(struct uart_port *, int))
-{
- unsigned int i;
-
- for (i = 0; i < count; i++, s++) {
- if (*s == '\n')
- putchar(port, '\r');
- putchar(port, *s);
- }
-}
-EXPORT_SYMBOL_GPL(uart_console_write);
-
-/*
- * Check whether an invalid uart number has been specified, and
- * if so, search for the first available port that does have
- * console support.
- */
-struct uart_port * __init
-uart_get_console(struct uart_port *ports, int nr, struct console *co)
-{
- int idx = co->index;
-
- if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
- ports[idx].membase == NULL))
- for (idx = 0; idx < nr; idx++)
- if (ports[idx].iobase != 0 ||
- ports[idx].membase != NULL)
- break;
-
- co->index = idx;
-
- return ports + idx;
-}
-
+#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_SERIAL_EARLYCON)
/**
* uart_parse_earlycon - Parse earlycon options
* @p: ptr to 2nd field (ie., just beyond '<name>,')
@@ -1851,6 +1808,51 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
return 0;
}
EXPORT_SYMBOL_GPL(uart_parse_earlycon);
+#endif
+
+#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
+/**
+ * uart_console_write - write a console message to a serial port
+ * @port: the port to write the message
+ * @s: array of characters
+ * @count: number of characters in string to write
+ * @putchar: function to write character to port
+ */
+void uart_console_write(struct uart_port *port, const char *s,
+ unsigned int count,
+ void (*putchar)(struct uart_port *, int))
+{
+ unsigned int i;
+
+ for (i = 0; i < count; i++, s++) {
+ if (*s == '\n')
+ putchar(port, '\r');
+ putchar(port, *s);
+ }
+}
+EXPORT_SYMBOL_GPL(uart_console_write);
+
+/*
+ * Check whether an invalid uart number has been specified, and
+ * if so, search for the first available port that does have
+ * console support.
+ */
+struct uart_port * __init
+uart_get_console(struct uart_port *ports, int nr, struct console *co)
+{
+ int idx = co->index;
+
+ if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
+ ports[idx].membase == NULL))
+ for (idx = 0; idx < nr; idx++)
+ if (ports[idx].iobase != 0 ||
+ ports[idx].membase != NULL)
+ break;
+
+ co->index = idx;
+
+ return ports + idx;
+}

/**
* uart_parse_options - Parse serial port baud/parity/bits/flow control.
--
2.3.5


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