Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / kernel / trace / trace_events.c

diff --git a/kernel/kernel/trace/trace_events.c b/kernel/kernel/trace/trace_events.c
index 0e508e9..5bd79b3 100644 (file)
--- a/kernel/kernel/trace/trace_events.c
+++ b/kernel/kernel/trace/trace_events.c
@@ -246,6 +246,14 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 
        local_save_flags(fbuffer->flags);
        fbuffer->pc = preempt_count();
+       /*
+        * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+        * preemption (adding one to the preempt_count). Since we are
+        * interested in the preempt_count at the time the tracepoint was
+        * hit, we need to subtract one to offset the increment.
+        */
+       if (IS_ENABLED(CONFIG_PREEMPT))
+               fbuffer->pc--;
        fbuffer->trace_file = trace_file;
 
        fbuffer->event =
@@ -2109,8 +2117,13 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file)
        trace_create_file("filter", 0644, file->dir, file,
                          &ftrace_event_filter_fops);
 
-       trace_create_file("trigger", 0644, file->dir, file,
-                         &event_trigger_fops);
+       /*
+        * Only event directories that can be enabled should have
+        * triggers.
+        */
+       if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
+               trace_create_file("trigger", 0644, file->dir, file,
+                                 &event_trigger_fops);
 
        trace_create_file("format", 0444, file->dir, call,
                          &ftrace_event_format_fops);