Commit 3b5e905e authored Jun 07, 2006 by Benjamin Herrenschmidt Committed by Paul Mackerras Jun 09, 2006

[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>

parent e78dbc80

arch/powerpc/kernel/udbg.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -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 */