From: Benjamin Herrenschmidt <benh@au1.ibm.com>
Date: Wed, 7 Jun 2006 02:06:20 +0000 (+1000)
Subject: [PATCH] powerpc: Add udbg-immortal kernel option
X-Git-Tag: v2.6.18-rc1~1081^2~225^2~70
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b5e905ee3bd23e9311951890aba57a0dbc81ca4;p=linux-2.6

[PATCH] powerpc: Add udbg-immortal kernel option

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>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 3774e80094..67d9fd9ae2 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -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 */