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    Subject[PATCH 2/2] kmsg_dump: adding to reboot, halt, poweroff and emergency_restart path
     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>

    ---
    include/linux/kmsg_dump.h | 4 ++++
    kernel/printk.c | 4 ++++
    kernel/sys.c | 6 ++++++
    3 files changed, 14 insertions(+), 0 deletions(-)

    diff --git a/include/linux/kmsg_dump.h b/include/linux/kmsg_dump.h
    index 24b4414..2a0d7d6 100644
    --- a/include/linux/kmsg_dump.h
    +++ b/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 --git a/kernel/printk.c b/kernel/printk.c
    index b2ebaee..c5648b4 100644
    --- a/kernel/printk.c
    +++ b/kernel/printk.c
    @@ -1516,6 +1516,10 @@ 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 --git a/kernel/sys.c b/kernel/sys.c
    index 7f5a0cd..3eab886 100644
    --- a/kernel/sys.c
    +++ b/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);
    --
    1.7.2.2
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