The patch titled
panic: panic=-1 for immediate reboot
has been added to the -mm tree. Its filename is
panic-panic=-1-for-immediate-reboot.patch
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------------------------------------------------------
Subject: panic: panic=-1 for immediate reboot
From: Hugh Dickins <hughd@xxxxxxxxxxxx>
When kernel BUG or oops occurs, ChromeOS intends to panic and immediately
reboot, with stacktrace and other messages preserved in RAM across reboot.
But the longer we delay, the more likely the user is to poweroff and lose
the info.
panic_timeout (seconds before rebooting) is set by panic= boot option or
sysctl or /proc/sys/kernel/panic; but 0 means wait forever, so at present
we have to delay at least 1 second.
Let a negative number mean reboot immediately (with the small cosmetic
benefit of suppressing that newline-less "Rebooting in %d seconds.."
message).
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxxxx>
Signed-off-by: Mandeep Singh Baines <msb@xxxxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Olaf Hering <olaf@xxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 4 +++-
kernel/panic.c | 2 ++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN Documentation/kernel-parameters.txt~panic-panic=-1-for-immediate-reboot Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~panic-panic=-1-for-immediate-reboot
+++ a/Documentation/kernel-parameters.txt
@@ -1851,7 +1851,9 @@ bytes respectively. Such letter suffixes
See Documentation/sound/oss/oss-parameters.txt
panic= [KNL] Kernel behaviour on panic: delay <timeout>
- seconds before rebooting
+ timeout > 0: seconds before rebooting
+ timeout = 0: wait forever
+ timeout < 0: reboot immediately
Format: <timeout>
parkbd.port= [HW] Parallel port number the keyboard adapter is
diff -puN kernel/panic.c~panic-panic=-1-for-immediate-reboot kernel/panic.c
--- a/kernel/panic.c~panic-panic=-1-for-immediate-reboot
+++ a/kernel/panic.c
@@ -119,6 +119,8 @@ NORET_TYPE void panic(const char * fmt,
}
mdelay(PANIC_TIMER_STEP);
}
+ }
+ if (panic_timeout != 0) {
/*
* This will not be a clean reboot, with everything
* shutting down. But if there is a chance of
_
Patches currently in -mm which might be from hughd@xxxxxxxxxxxx are
panic-panic=-1-for-immediate-reboot.patch
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