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kmsg_dump: add kmsg_dump() calls to the reboot, halt, poweroff and emergency_restart paths

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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@hds.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Marco Stornelli <marco.stornelli@gmail.com>
Reviewed-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Seiji Aguchi 2011-01-12 16:59:30 -08:00 committed by Linus Torvalds
parent fc2d557c74
commit 04c6862c05
3 changed files with 14 additions and 0 deletions
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4
include/linux/kmsg_dump.h
View file

@ -18,6 +18,10 @@ enum kmsg_dump_reason {
KMSG_DUMP_OOPS, KMSG_DUMP_OOPS,
KMSG_DUMP_PANIC, KMSG_DUMP_PANIC,
KMSG_DUMP_KEXEC, KMSG_DUMP_KEXEC,
KMSG_DUMP_RESTART,
KMSG_DUMP_HALT,
KMSG_DUMP_POWEROFF,
KMSG_DUMP_EMERG,
}; };
/** /**

4
kernel/printk.c
View file

@ -1539,6 +1539,10 @@ static const char * const kmsg_reasons[] = {
[KMSG_DUMP_OOPS] = "oops", [KMSG_DUMP_OOPS] = "oops",
[KMSG_DUMP_PANIC] = "panic", [KMSG_DUMP_PANIC] = "panic",
[KMSG_DUMP_KEXEC] = "kexec", [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) static const char *kmsg_to_str(enum kmsg_dump_reason reason)

6
kernel/sys.c
View file

@ -43,6 +43,8 @@
#include <linux/kprobes.h> #include <linux/kprobes.h>
#include <linux/user_namespace.h> #include <linux/user_namespace.h>
#include <linux/kmsg_dump.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/unistd.h> #include <asm/unistd.h>
@ -285,6 +287,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
*/ */
void emergency_restart(void) void emergency_restart(void)
{ {
kmsg_dump(KMSG_DUMP_EMERG);
machine_emergency_restart(); machine_emergency_restart();
} }
EXPORT_SYMBOL_GPL(emergency_restart); EXPORT_SYMBOL_GPL(emergency_restart);
@ -312,6 +315,7 @@ void kernel_restart(char *cmd)
printk(KERN_EMERG "Restarting system.\n"); printk(KERN_EMERG "Restarting system.\n");
else else
printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
kmsg_dump(KMSG_DUMP_RESTART);
machine_restart(cmd); machine_restart(cmd);
} }
EXPORT_SYMBOL_GPL(kernel_restart); EXPORT_SYMBOL_GPL(kernel_restart);
@ -333,6 +337,7 @@ void kernel_halt(void)
kernel_shutdown_prepare(SYSTEM_HALT); kernel_shutdown_prepare(SYSTEM_HALT);
sysdev_shutdown(); sysdev_shutdown();
printk(KERN_EMERG "System halted.\n"); printk(KERN_EMERG "System halted.\n");
kmsg_dump(KMSG_DUMP_HALT);
machine_halt(); machine_halt();
} }
@ -351,6 +356,7 @@ void kernel_power_off(void)
disable_nonboot_cpus(); disable_nonboot_cpus();
sysdev_shutdown(); sysdev_shutdown();
printk(KERN_EMERG "Power down.\n"); printk(KERN_EMERG "Power down.\n");
kmsg_dump(KMSG_DUMP_POWEROFF);
machine_power_off(); machine_power_off();
} }
EXPORT_SYMBOL_GPL(kernel_power_off); EXPORT_SYMBOL_GPL(kernel_power_off);