TTY: 8250, deprecated 8250_core.* options

They were introduced by mistake in 3.7. Let's deprecate them now. For
the reasons, see the text in Kconfig below.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_core.c

@@ -3418,6 +3418,7 @@ MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
 #endif
 MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
 
+#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
 #ifndef MODULE
 /* This module was renamed to 8250_core in 3.7.  Keep the old "8250" name
  * working as well for the module options so we don't break people.  We
@@ -3446,3 +3447,4 @@ static void __used s8250_options(void)
 #else
 MODULE_ALIAS("8250_core");
 #endif
+#endif

drivers/tty/serial/8250/Kconfig

@@ -33,6 +33,23 @@ config SERIAL_8250
 	  Most people will say Y or M here, so that they can use serial mice,
 	  modems and similar devices connecting to the standard serial ports.
 
+config SERIAL_8250_DEPRECATED_OPTIONS
+	bool "Support 8250_core.* kernel options (DEPRECATED)"
+	depends on SERIAL_8250
+	default y
+	---help---
+	  In 3.7 we renamed 8250 to 8250_core by mistake, so now we have to
+	  accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
+	  8250.nr_uarts=4. We now renamed the module back to 8250, but if
+	  anybody noticed in 3.7 and changed their userspace we still have to
+	  keep the 8350_core.* options around until they revert the changes
+	  they already did.
+
+	  If 8250 is built as a module, this adds 8250_core alias instead. 
+
+	  If you did not notice yet and/or you have userspace from pre-3.7, it
+	  is safe (and recommended) to say N here.
+
 config SERIAL_8250_PNP
 	bool "8250/16550 PNP device support" if EXPERT
 	depends on SERIAL_8250 && PNP