The patch titled
kmsg_dump: add kmsg_dump() calls to the reboot, halt, poweroff and emergency_restart paths
has been added to the -mm tree. Its filename is
kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths.patch
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------------------------------------------------------
Subject: kmsg_dump: add kmsg_dump() calls to the reboot, halt, poweroff and emergency_restart paths
From: Seiji Aguchi <seiji.aguchi@xxxxxxx>
We need to know the reason why system rebooted in support service.
However, we can't inform our customers of the reason because final
messages are lost on current Linux kernel.
This patch improves the situation above because the final messages are
saved by adding kmsg_dump() to reboot, halt, poweroff and
emergency_restart path.
Signed-off-by: Seiji Aguchi <seiji.aguchi@xxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Marco Stornelli <marco.stornelli@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kmsg_dump.h | 4 ++++
kernel/printk.c | 4 ++++
kernel/sys.c | 6 ++++++
3 files changed, 14 insertions(+)
diff -puN include/linux/kmsg_dump.h~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths include/linux/kmsg_dump.h
--- a/include/linux/kmsg_dump.h~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths
+++ a/include/linux/kmsg_dump.h
@@ -18,6 +18,10 @@ enum kmsg_dump_reason {
KMSG_DUMP_OOPS,
KMSG_DUMP_PANIC,
KMSG_DUMP_KEXEC,
+ KMSG_DUMP_RESTART,
+ KMSG_DUMP_HALT,
+ KMSG_DUMP_POWEROFF,
+ KMSG_DUMP_EMERG,
};
/**
diff -puN kernel/printk.c~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths kernel/printk.c
--- a/kernel/printk.c~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths
+++ a/kernel/printk.c
@@ -1529,6 +1529,10 @@ static const char * const kmsg_reasons[]
[KMSG_DUMP_OOPS] = "oops",
[KMSG_DUMP_PANIC] = "panic",
[KMSG_DUMP_KEXEC] = "kexec",
+ [KMSG_DUMP_RESTART] = "restart",
+ [KMSG_DUMP_HALT] = "halt",
+ [KMSG_DUMP_POWEROFF] = "poweroff",
+ [KMSG_DUMP_EMERG] = "emergency_restart",
};
static const char *kmsg_to_str(enum kmsg_dump_reason reason)
diff -puN kernel/sys.c~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths kernel/sys.c
--- a/kernel/sys.c~kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths
+++ a/kernel/sys.c
@@ -43,6 +43,8 @@
#include <linux/kprobes.h>
#include <linux/user_namespace.h>
+#include <linux/kmsg_dump.h>
+
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/unistd.h>
@@ -285,6 +287,7 @@ out_unlock:
*/
void emergency_restart(void)
{
+ kmsg_dump(KMSG_DUMP_EMERG);
machine_emergency_restart();
}
EXPORT_SYMBOL_GPL(emergency_restart);
@@ -312,6 +315,7 @@ void kernel_restart(char *cmd)
printk(KERN_EMERG "Restarting system.\n");
else
printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+ kmsg_dump(KMSG_DUMP_RESTART);
machine_restart(cmd);
}
EXPORT_SYMBOL_GPL(kernel_restart);
@@ -333,6 +337,7 @@ void kernel_halt(void)
kernel_shutdown_prepare(SYSTEM_HALT);
sysdev_shutdown();
printk(KERN_EMERG "System halted.\n");
+ kmsg_dump(KMSG_DUMP_HALT);
machine_halt();
}
@@ -351,6 +356,7 @@ void kernel_power_off(void)
disable_nonboot_cpus();
sysdev_shutdown();
printk(KERN_EMERG "Power down.\n");
+ kmsg_dump(KMSG_DUMP_POWEROFF);
machine_power_off();
}
EXPORT_SYMBOL_GPL(kernel_power_off);
_
Patches currently in -mm which might be from seiji.aguchi@xxxxxxx are
kmsg_dump-constrain-mtdoops-and-ramoops-to-perform-their-actions-only-for-kmsg_dump_panic.patch
kmsg_dump-add-kmsg_dump-calls-to-the-reboot-halt-poweroff-and-emergency_restart-paths.patch
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