2 files changed, 17 insertions, 0 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 294b8a271a04..fc4da2d97f9b 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2397,6 +2397,13 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
         write &= RB_WRITE_MASK;
         tail = write - length;
 
+        /*
+         * If this is the first commit on the page, then it has the same
+         * timestamp as the page itself.
+         */
+        if (!tail)
+                delta = 0;
+
         /* See if we shot pass the end of this buffer page */
         if (unlikely(write > BUF_PAGE_SIZE))
                 return rb_move_tail(cpu_buffer, length, tail,
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index e71ffd4eccb5..f3989ceb5cd5 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1777,6 +1777,16 @@ static void trace_module_add_events(struct module *mod)
 {
         struct ftrace_event_call **call, **start, **end;
 
+        if (!mod->num_trace_events)
+                return;
+
+        /* Don't add infrastructure for mods without tracepoints */
+        if (trace_module_has_bad_taint(mod)) {
+                pr_err("%s: module has bad taint, not creating trace events\n",
+                       mod->name);
+                return;
+        }
+
         start = mod->trace_events;
         end = mod->trace_events + mod->num_trace_events;