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    Subject[PATCH] ftrace: sysrq-z to dump the buffers
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    Allows one to force an ftrace dump from sysrq

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
    index ce0d9da..e20d6db 100644
    --- a/drivers/char/sysrq.c
    +++ b/drivers/char/sysrq.c
    @@ -274,6 +274,22 @@ static struct sysrq_key_op sysrq_showstate_blocked_op = {
    .enable_mask = SYSRQ_ENABLE_DUMP,
    };

    +#ifdef CONFIG_FTRACE
    +#include <linux/ftrace.h>
    +
    +static void sysrq_ftrace_dump(int key, struct tty_struct *tty)
    +{
    + ftrace_dump();
    +}
    +static struct sysrq_key_op sysrq_ftrace_dump_op = {
    + .handler = sysrq_ftrace_dump,
    + .help_msg = "dumpZ-ftrace-buffer",
    + .action_msg = "Dump ftrace buffer",
    + .enable_mask = SYSRQ_ENABLE_DUMP,
    +};
    +#else
    +#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)
    +#endif

    static void sysrq_handle_showmem(int key, struct tty_struct *tty)
    {
    @@ -406,7 +422,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
    NULL, /* x */
    /* y: May be registered on sparc64 for global register dump */
    NULL, /* y */
    - NULL /* z */
    + &sysrq_ftrace_dump_op, /* z */
    };

    /* key2index calculation, -1 on invalid index */



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