diff options
| author | Benjamin Herrenschmidt <benh@au1.ibm.com> | 2006-06-07 12:06:20 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-06-09 21:24:10 +1000 |
| commit | 3b5e905ee3bd23e9311951890aba57a0dbc81ca4 (patch) | |
| tree | 700e3dd7e21b09006216647fb0dec284b682f2ab /arch/powerpc | |
| parent | e78dbc800c37f035d476c4fdebdf43cdecfcb731 (diff) | |
[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>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/udbg.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index 3774e80094f..67d9fd9ae2b 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 */ |