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>

1 files changed, 1 insertions, 3 deletions

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index adf28734fe2d..1ef5d3a601c7 100644
--- 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++) {