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[PATCH] powerpc: Add udbg-immortal kernel option

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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>
This commit is contained in:
Benjamin Herrenschmidt 2006-06-07 12:06:20 +10:00 committed by Paul Mackerras
parent e78dbc800c
commit 3b5e905ee3
1 changed files with 5 additions and 2 deletions
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7
arch/powerpc/kernel/udbg.c
View file

@ -14,6 +14,7 @@
#include <linux/types.h> #include <linux/types.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/console.h> #include <linux/console.h>
#include <linux/init.h>
#include <asm/processor.h> #include <asm/processor.h>
#include <asm/udbg.h> #include <asm/udbg.h>
@ -141,12 +142,14 @@ static int early_console_initialized;
void __init disable_early_printk(void) void __init disable_early_printk(void)
{ {
#if 1
if (!early_console_initialized) if (!early_console_initialized)
return; return;
if (strstr(saved_command_line, "udbg-immortal")) {
printk(KERN_INFO "early console immortal !\n");
return;
}
unregister_console(&udbg_console); unregister_console(&udbg_console);
early_console_initialized = 0; early_console_initialized = 0;
#endif
} }
/* called by setup_system */ /* called by setup_system */