[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>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 3774e80094f5..67d9fd9ae2b5 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 */