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    Subject[PATCH 2/4] panic: use the aural error reporting framework to report panics
    Date
    Use the new aural error reporting framework to signal kernel panic. The
    error sound is emitted between the stack dump and the kexec jump.

    Signed-off-by: Matteo Croce <mcroce@redhat.com>
    ---
    kernel/panic.c | 25 +++++++++++++++++++++++++
    lib/Kconfig.debug | 10 ++++++++++
    2 files changed, 35 insertions(+)

    diff --git a/kernel/panic.c b/kernel/panic.c
    index 0ae0d7332f12..360578e092e7 100644
    --- a/kernel/panic.c
    +++ b/kernel/panic.c
    @@ -29,6 +29,7 @@
    #include <linux/bug.h>
    #include <linux/ratelimit.h>
    #include <linux/debugfs.h>
    +#include <linux/play.h>
    #include <asm/sections.h>

    #define PANIC_TIMER_STEP 100
    @@ -57,6 +58,29 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);

    EXPORT_SYMBOL(panic_notifier_list);

    +#ifdef CONFIG_AUDIBLE_PANIC
    +static struct note panic_sound[] = {
    + { 784, 400 },
    + { 784, 400 },
    + { 784, 400 },
    + { 622, 300 },
    + { 932, 100 },
    + { 784, 400 },
    + { 622, 300 },
    + { 932, 100 },
    + { 784, 800 },
    + { 1174, 400 },
    + { 1174, 400 },
    + { 1174, 400 },
    + { 1244, 300 },
    + { 932, 100 },
    + { 740, 400 },
    + { 622, 300 },
    + { 932, 100 },
    + { 784, 800 },
    +};
    +#endif
    +
    static long no_blink(int state)
    {
    return 0;
    @@ -213,6 +237,7 @@ void panic(const char *fmt, ...)
    if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
    dump_stack();
    #endif
    + play(panic_sound, ARRAY_SIZE(panic_sound));

    /*
    * If we have crashed and we have a crash kernel loaded let it handle
    diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
    index 10d04b266aef..e5d187dfc74a 100644
    --- a/lib/Kconfig.debug
    +++ b/lib/Kconfig.debug
    @@ -997,6 +997,16 @@ config PLAY_LIB
    depends on HAVE_PCSPKR_PLATFORM
    default n

    +config AUDIBLE_PANIC
    + bool "Aural panic"
    + select PLAY_LIB
    + default n
    + help
    + If you say Y here, kernel panics will play a sound just
    + after the stacktrace and registers dump. The sound is played via
    + the system buzzer and not via any soundcard.
    + Not available on all platforms.
    +
    config SCHED_DEBUG
    bool "Collect scheduler debugging info"
    depends on DEBUG_KERNEL && PROC_FS
    --
    2.20.1
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