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    SubjectRe: [PATCH -tip -v11 11/11] tracing: Add kprobes event profiling interface
    > +Event Profiling
    > +---------------
    > + You can check the total number of probe hits and probe miss-hits via
    > +/sys/kernel/debug/tracing/kprobe_profile.
    > + The fist column is event name, the second is the number of probe hits,

    s/fist/first

    > +the third is the number of probe miss-hits.
    > +
    > +
    ...
    > +/* Probes profiling interfaces */
    > +static int profile_seq_show(struct seq_file *m, void *v)
    > +{
    > + struct trace_probe *tp = v;
    > +
    > + if (tp == NULL)
    > + return 0;
    > +

    tp will never be NULL, which is guaranteed by seq_file

    > + seq_printf(m, "%s", tp->call.name);
    > +
    > + seq_printf(m, "\t%8lu %8lu\n", tp->nhits,
    > + probe_is_return(tp) ? tp->rp.kp.nmissed : tp->kp.nmissed);
    > +
    > + return 0;
    > +}


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