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    Subject[PATCH 1/4] tracing: introduce for_each_token macro
    Date
    Introduce for_each_token macro to parse the trace event list.

    Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
    ---
    kernel/trace/trace_events.c | 14 ++++++--------
    1 files changed, 6 insertions(+), 8 deletions(-)

    diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
    index 0725eea..fe15b7c 100644
    --- a/kernel/trace/trace_events.c
    +++ b/kernel/trace/trace_events.c
    @@ -1218,6 +1218,11 @@ void trace_remove_event_call(struct ftrace_event_call *call)
    mutex_unlock(&event_mutex);
    }

    +#define for_each_token(token, buf) \
    + for (token = strsep(&buf, ","); \
    + token && *token; \
    + token = strsep(&buf, ","))
    +
    #define for_each_event(event, start, end) \
    for (event = start; \
    (unsigned long)event < (unsigned long)end; \
    @@ -1430,14 +1435,7 @@ static __init int event_trace_init(void)
    &ftrace_event_format_fops);
    }

    - while (true) {
    - token = strsep(&buf, ",");
    -
    - if (!token)
    - break;
    - if (!*token)
    - continue;
    -
    + for_each_token(token, buf) {
    ret = ftrace_set_clr_event(token, 1);
    if (ret)
    pr_warning("Failed to enable trace event: %s\n", token);
    --
    1.7.2.3


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