tracepoints: dont update zero-sized tracepoint sections

Zero-sized tracepoint sections can occur if tracing is enabled but
no tracepoint is defined. Do not emit a warning in that case.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
LKML-Reference: <1237394936.3132.1.camel@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index adf2873..1ef5d3a 100644 (file)
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -278,10 +278,8 @@ tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
        struct tracepoint *iter;
        struct tracepoint_entry *mark_entry;
 
-       if (!begin) {
-               WARN_ON_ONCE(1);
+       if (!begin)
                return;
-       }
 
        mutex_lock(&tracepoints_mutex);
        for (iter = begin; iter < end; iter++) {