[PATCH] powerpc: Add udbg-immortal kernel option

[Benjamin Herrenschmidt <benh@au1.ibm.com>]

When debugging early kernel crashes that happen after console_init() and
before a proper console driver takes over, we often have to go hack into
udbg.c to prevent it from unregistering so we can "see" what is
happening. This patch adds a kernel command line option "udbg-immortal"
instead to avoid having to modify the kernel.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

---
Paul: this is not 2.6.17 material

Index: linux-work/arch/powerpc/kernel/udbg.c
===================================================================
--- linux-work.orig/arch/powerpc/kernel/udbg.c	2006-05-31 14:13:59.000000000 +1000
+++ linux-work/arch/powerpc/kernel/udbg.c	2006-05-31 14:48:07.000000000 +1000
@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <linux/console.h>
+#include <linux/init.h>
 #include <asm/processor.h>
 #include <asm/udbg.h>
 
@@ -141,12 +142,14 @@ static int early_console_initialized;
 
 void __init disable_early_printk(void)
 {
-#if 1
 	if (!early_console_initialized)
 		return;
+	if (strstr(saved_command_line, "udbg-immortal")) {
+		printk(KERN_INFO "early console immortal !\n");
+		return;
+	}
 	unregister_console(&udbg_console);
 	early_console_initialized = 0;
-#endif
 }
 
 /* called by setup_system */