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Subject[PATCH 1/1] kernel: panic: display reason at end + pr_emerg
Currently, booting without initrd specified on 80x25 screen
gives a call trace followed by atkbd : Spurious ACK.
Original message ("VFS: Unable to mount root fs") is not available.
Of course this could happen in other situations...

-This patch displays panic reason after call trace which could help
lot of people even if it's not the very last line on screen.

-Converting all panic.c printk(KERN_EMERG to pr_emerg(

Signed-off-by: Fabian Frederick <fabf@skynet.be>
---
kernel/panic.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index 6d63003..b71d520 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -100,7 +100,7 @@ void panic(const char *fmt, ...)
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
- printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
+ pr_emerg("Kernel panic - not syncing: %s\n", buf);
#ifdef CONFIG_DEBUG_BUGVERBOSE
/*
* Avoid nested stack-dumping if a panic occurs during oops processing
@@ -141,7 +141,7 @@ void panic(const char *fmt, ...)
* Delay timeout seconds before rebooting the machine.
* We can't use the "normal" timers since we just panicked.
*/
- printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
+ pr_emerg("Rebooting in %d seconds..", panic_timeout);

for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
touch_nmi_watchdog();
@@ -165,7 +165,7 @@ void panic(const char *fmt, ...)
extern int stop_a_enabled;
/* Make sure the user can actually press Stop-A (L1-A) */
stop_a_enabled = 1;
- printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
+ pr_emerg("Press Stop-A (L1-A) to return to the boot prom\n");
}
#endif
#if defined(CONFIG_S390)
@@ -176,6 +176,7 @@ void panic(const char *fmt, ...)
disabled_wait(caller);
}
#endif
+ pr_emerg("---[ end Kernel panic - not syncing: %s\n", buf);
local_irq_enable();
for (i = 0; ; i += PANIC_TIMER_STEP) {
touch_softlockup_watchdog();
--
1.8.1.4


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