diff --git a/[refs] b/[refs]
index 8486f1f44105..737757bd7f26 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 609e5b71d0eca163df017ecfcf917b149875e744
+refs/heads/master: 52e15f0eae193a8e4ca31c1520179b8d65c79811
diff --git a/trunk/drivers/serial/bfin_5xx.c b/trunk/drivers/serial/bfin_5xx.c
index 569f0e2476c6..d63fad7363b7 100644
--- a/trunk/drivers/serial/bfin_5xx.c
+++ b/trunk/drivers/serial/bfin_5xx.c
@@ -22,7 +22,8 @@
 #include <linux/tty_flip.h>
 #include <linux/serial_core.h>
 
-#ifdef CONFIG_KGDB_UART
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
 #include <linux/kgdb.h>
 #include <asm/irq_regs.h>
 #endif
@@ -45,6 +46,16 @@
 static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
 static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);
 
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+
+# ifndef CONFIG_SERIAL_BFIN_PIO
+#  error KGDB only support UART in PIO mode.
+# endif
+
+static int kgdboc_port_line;
+static int kgdboc_break_enabled;
+#endif
 /*
  * Setup for console. Argument comes from the menuconfig
  */
@@ -110,9 +121,7 @@ static void bfin_serial_start_tx(struct uart_port *port)
 static void bfin_serial_stop_rx(struct uart_port *port)
 {
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-#ifdef CONFIG_KGDB_UART
-	if (uart->port.line != CONFIG_KGDB_UART_PORT)
-#endif
+
 	UART_CLEAR_IER(uart, ERBFI);
 }
 
@@ -123,49 +132,6 @@ static void bfin_serial_enable_ms(struct uart_port *port)
 {
 }
 
-#ifdef CONFIG_KGDB_UART
-static int kgdb_entry_state;
-
-void kgdb_put_debug_char(int chr)
-{
-	struct bfin_serial_port *uart;
-
-	if (CONFIG_KGDB_UART_PORT < 0
-		|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
-		uart = &bfin_serial_ports[0];
-	else
-		uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
-
-	while (!(UART_GET_LSR(uart) & THRE)) {
-		SSYNC();
-	}
-
-	UART_CLEAR_DLAB(uart);
-	UART_PUT_CHAR(uart, (unsigned char)chr);
-	SSYNC();
-}
-
-int kgdb_get_debug_char(void)
-{
-	struct bfin_serial_port *uart;
-	unsigned char chr;
-
-	if (CONFIG_KGDB_UART_PORT < 0
-		|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
-		uart = &bfin_serial_ports[0];
-	else
-		uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
-
-	while(!(UART_GET_LSR(uart) & DR)) {
-		SSYNC();
-	}
-	UART_CLEAR_DLAB(uart);
-	chr = UART_GET_CHAR(uart);
-	SSYNC();
-
-	return chr;
-}
-#endif
 
 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
@@ -178,7 +144,7 @@ int kgdb_get_debug_char(void)
 #ifdef CONFIG_SERIAL_BFIN_PIO
 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 {
-	struct tty_struct *tty = uart->port.info->port.tty;
+	struct tty_struct *tty = NULL;
 	unsigned int status, ch, flg;
 	static struct timeval anomaly_start = { .tv_sec = 0 };
 
@@ -188,27 +154,18 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
  	ch = UART_GET_CHAR(uart);
  	uart->port.icount.rx++;
 
-#ifdef CONFIG_KGDB_UART
-	if (uart->port.line == CONFIG_KGDB_UART_PORT) {
-		struct pt_regs *regs = get_irq_regs();
-		if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
-			kgdb_breakkey_pressed(regs);
-			return;
-		} else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
-			kgdb_entry_state = 1;
-		} else if (kgdb_entry_state == 1 && ch == 'q') {
-			kgdb_entry_state = 0;
-			kgdb_breakkey_pressed(regs);
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+	if (kgdb_connected && kgdboc_port_line == uart->port.line)
+		if (ch == 0x3) {/* Ctrl + C */
+			kgdb_breakpoint();
 			return;
-		} else if (ch == 0x3) {/* Ctrl + C */
-			kgdb_entry_state = 0;
-			kgdb_breakkey_pressed(regs);
-			return;
-		} else {
-			kgdb_entry_state = 0;
 		}
-	}
+
+	if (!uart->port.info || !uart->port.info->tty)
+		return;
 #endif
+	tty = uart->port.info->tty;
 
 	if (ANOMALY_05000363) {
 		/* The BF533 (and BF561) family of processors have a nice anomaly
@@ -630,16 +587,16 @@ static int bfin_serial_startup(struct uart_port *port)
 	uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 	add_timer(&(uart->rx_dma_timer));
 #else
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+	if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
+		kgdboc_break_enabled = 0;
+	else {
+# endif
 	if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 	     "BFIN_UART_RX", uart)) {
-# ifdef	CONFIG_KGDB_UART
-		if (uart->port.line != CONFIG_KGDB_UART_PORT) {
-# endif
 		printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 		return -EBUSY;
-# ifdef	CONFIG_KGDB_UART
-		}
-# endif
 	}
 
 	if (request_irq
@@ -685,6 +642,10 @@ static int bfin_serial_startup(struct uart_port *port)
 		}
 	}
 # endif
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+	}
+# endif
 #endif
 	UART_SET_IER(uart, ERBFI);
 	return 0;
@@ -715,9 +676,6 @@ static void bfin_serial_shutdown(struct uart_port *port)
 	default:
 		break;
 	};
-#endif
-#ifdef	CONFIG_KGDB_UART
-	if (uart->port.line != CONFIG_KGDB_UART_PORT)
 #endif
 	free_irq(uart->port.irq, uart);
 	free_irq(uart->port.irq+1, uart);
@@ -887,6 +845,51 @@ static void bfin_serial_set_ldisc(struct uart_port *port)
 	}
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
+{
+	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+	while (!(UART_GET_LSR(uart) & THRE))
+		cpu_relax();
+
+	UART_CLEAR_DLAB(uart);
+	UART_PUT_CHAR(uart, (unsigned char)chr);
+}
+
+static int bfin_serial_poll_get_char(struct uart_port *port)
+{
+	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+	unsigned char chr;
+
+	while (!(UART_GET_LSR(uart) & DR))
+		cpu_relax();
+
+	UART_CLEAR_DLAB(uart);
+	chr = UART_GET_CHAR(uart);
+
+	return chr;
+}
+#endif
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+static void bfin_kgdboc_port_shutdown(struct uart_port *port)
+{
+	if (kgdboc_break_enabled) {
+		kgdboc_break_enabled = 0;
+		bfin_serial_shutdown(port);
+	}
+}
+
+static int bfin_kgdboc_port_startup(struct uart_port *port)
+{
+	kgdboc_port_line = port->line;
+	kgdboc_break_enabled = !bfin_serial_startup(port);
+	return 0;
+}
+#endif
+
 static struct uart_ops bfin_serial_pops = {
 	.tx_empty	= bfin_serial_tx_empty,
 	.set_mctrl	= bfin_serial_set_mctrl,
@@ -905,6 +908,15 @@ static struct uart_ops bfin_serial_pops = {
 	.request_port	= bfin_serial_request_port,
 	.config_port	= bfin_serial_config_port,
 	.verify_port	= bfin_serial_verify_port,
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+	.kgdboc_port_startup	= bfin_kgdboc_port_startup,
+	.kgdboc_port_shutdown	= bfin_kgdboc_port_shutdown,
+#endif
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_put_char	= bfin_serial_poll_put_char,
+	.poll_get_char	= bfin_serial_poll_get_char,
+#endif
 };
 
 static void __init bfin_serial_init_ports(void)
@@ -1076,10 +1088,7 @@ static int __init bfin_serial_rs_console_init(void)
 {
 	bfin_serial_init_ports();
 	register_console(&bfin_serial_console);
-#ifdef CONFIG_KGDB_UART
-	kgdb_entry_state = 0;
-	init_kgdb_uart();
-#endif
+
 	return 0;
 }
 console_initcall(bfin_serial_rs_console_init);
@@ -1235,10 +1244,6 @@ static struct platform_driver bfin_serial_driver = {
 static int __init bfin_serial_init(void)
 {
 	int ret;
-#ifdef CONFIG_KGDB_UART
-	struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
-	struct ktermios t;
-#endif
 
 	pr_info("Serial: Blackfin serial driver\n");
 
@@ -1252,21 +1257,6 @@ static int __init bfin_serial_init(void)
 			uart_unregister_driver(&bfin_serial_reg);
 		}
 	}
-#ifdef CONFIG_KGDB_UART
-	if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
-		request_irq(uart->port.irq, bfin_serial_rx_int,
-			IRQF_DISABLED, "BFIN_UART_RX", uart);
-		pr_info("Request irq for kgdb uart port\n");
-		UART_SET_IER(uart, ERBFI);
-		SSYNC();
-		t.c_cflag = CS8|B57600;
-		t.c_iflag = 0;
-		t.c_oflag = 0;
-		t.c_lflag = ICANON;
-		t.c_line = CONFIG_KGDB_UART_PORT;
-		bfin_serial_set_termios(&uart->port, &t, &t);
-	}
-#endif
 	return ret;
 }
 
@@ -1276,6 +1266,7 @@ static void __exit bfin_serial_exit(void)
 	uart_unregister_driver(&bfin_serial_reg);
 }
 
+
 module_init(bfin_serial_init);
 module_exit(bfin_serial_exit);
 
diff --git a/trunk/include/linux/compiler-gcc.h b/trunk/include/linux/compiler-gcc.h
index af40f8eb86f0..5c8351b859f0 100644
--- a/trunk/include/linux/compiler-gcc.h
+++ b/trunk/include/linux/compiler-gcc.h
@@ -61,8 +61,3 @@
 #define  noinline			__attribute__((noinline))
 #define __attribute_const__		__attribute__((__const__))
 #define __maybe_unused			__attribute__((unused))
-
-#define __gcc_header(x) #x
-#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
-#define gcc_header(x) _gcc_header(x)
-#include gcc_header(__GNUC__)
diff --git a/trunk/include/linux/compiler-gcc3.h b/trunk/include/linux/compiler-gcc3.h
index 2befe6513ce4..e5eb795f78a1 100644
--- a/trunk/include/linux/compiler-gcc3.h
+++ b/trunk/include/linux/compiler-gcc3.h
@@ -2,6 +2,9 @@
 #error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
 #endif
 
+/* These definitions are for GCC v3.x.  */
+#include <linux/compiler-gcc.h>
+
 #if __GNUC_MINOR__ >= 3
 # define __used			__attribute__((__used__))
 #else
diff --git a/trunk/include/linux/compiler-gcc4.h b/trunk/include/linux/compiler-gcc4.h
index 09992718f9e8..974f5b7bb205 100644
--- a/trunk/include/linux/compiler-gcc4.h
+++ b/trunk/include/linux/compiler-gcc4.h
@@ -2,10 +2,8 @@
 #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
 #endif
 
-/* GCC 4.1.[01] miscompiles __weak */
-#if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
-# error Your version of gcc miscompiles the __weak directive
-#endif
+/* These definitions are for GCC v4.x.  */
+#include <linux/compiler-gcc.h>
 
 #define __used			__attribute__((__used__))
 #define __must_check 		__attribute__((warn_unused_result))
@@ -18,7 +16,7 @@
  */
 #define uninitialized_var(x) x = x
 
-#if __GNUC_MINOR__ >= 3
+#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 3)
 /* Mark functions as cold. gcc will assume any path leading to a call
    to them will be unlikely.  This means a lot of manual unlikely()s
    are unnecessary now for any paths leading to the usual suspects
diff --git a/trunk/include/linux/compiler.h b/trunk/include/linux/compiler.h
index d95da1020f1c..ea7c6be354b7 100644
--- a/trunk/include/linux/compiler.h
+++ b/trunk/include/linux/compiler.h
@@ -36,8 +36,12 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 
 #ifdef __KERNEL__
 
-#ifdef __GNUC__
-#include <linux/compiler-gcc.h>
+#if __GNUC__ >= 4
+# include <linux/compiler-gcc4.h>
+#elif __GNUC__ == 3 && __GNUC_MINOR__ >= 2
+# include <linux/compiler-gcc3.h>
+#else
+# error Sorry, your compiler is too old/not recognized.
 #endif
 
 #define notrace __attribute__((no_instrument_function))
diff --git a/trunk/init/main.c b/trunk/init/main.c
index ad8f9f53f8d1..f5e64f20d2b0 100644
--- a/trunk/init/main.c
+++ b/trunk/init/main.c
@@ -75,6 +75,15 @@
 #include <asm/smp.h>
 #endif
 
+/*
+ * This is one of the first .c files built. Error out early if we have compiler
+ * trouble.
+ */
+
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
+#warning gcc-4.1.0 is known to miscompile the kernel.  A different compiler version is recommended.
+#endif
+
 static int kernel_init(void *);
 
 extern void init_IRQ(void);