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authorBenjamin Herrenschmidt <benh@au1.ibm.com>2006-06-07 12:06:20 +1000
committerPaul Mackerras <paulus@samba.org>2006-06-09 21:24:10 +1000
commit3b5e905ee3bd23e9311951890aba57a0dbc81ca4 (patch)
tree700e3dd7e21b09006216647fb0dec284b682f2ab /arch/powerpc
parente78dbc800c37f035d476c4fdebdf43cdecfcb731 (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.c7
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 */