tracing/ftrace: Allow for the traceonoff probe be unique to instances

Have the traceon/off function probe triggers affect only the instance they
are set in. This required making the trace_on/off accessible for other files
in the tracing directory.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

3 files changed, 15 insertions, 12 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 57e9c546bebb..60c904fa5480 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -757,7 +757,7 @@ __trace_buffer_lock_reserve(struct ring_buffer *buffer,
         return event;
 }
 
-static void tracer_tracing_on(struct trace_array *tr)
+void tracer_tracing_on(struct trace_array *tr)
 {
         if (tr->trace_buffer.buffer)
                 ring_buffer_record_on(tr->trace_buffer.buffer);
@@ -1045,7 +1045,7 @@ void tracing_snapshot_alloc(void)
 EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
 #endif /* CONFIG_TRACER_SNAPSHOT */
 
-static void tracer_tracing_off(struct trace_array *tr)
+void tracer_tracing_off(struct trace_array *tr)
 {
         if (tr->trace_buffer.buffer)
                 ring_buffer_record_off(tr->trace_buffer.buffer);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8f6754fba778..bc011c1f3d71 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -582,6 +582,8 @@ void tracing_reset_all_online_cpus(void);
 int tracing_open_generic(struct inode *inode, struct file *filp);
 bool tracing_is_disabled(void);
 int tracer_tracing_is_on(struct trace_array *tr);
+void tracer_tracing_on(struct trace_array *tr);
+void tracer_tracing_off(struct trace_array *tr);
 struct dentry *trace_create_file(const char *name,
                                  umode_t mode,
                                  struct dentry *parent,
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 7775e1ca5bad..8c30ca733a5c 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -268,7 +268,8 @@ static struct tracer function_trace __tracer_data =
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 static void update_traceon_count(struct ftrace_probe_ops *ops,
-                                 unsigned long ip, bool on,
+                                 unsigned long ip,
+                                 struct trace_array *tr, bool on,
                                  void *data)
 {
         struct ftrace_func_mapper *mapper = data;
@@ -313,13 +314,13 @@ static void update_traceon_count(struct ftrace_probe_ops *ops,
         /* Make sure we see count before checking tracing state */
         smp_rmb();
 
-        if (on == !!tracing_is_on())
+        if (on == !!tracer_tracing_is_on(tr))
                 return;
 
         if (on)
-                tracing_on();
+                tracer_tracing_on(tr);
         else
-                tracing_off();
+                tracer_tracing_off(tr);
 
         /* Make sure tracing state is visible before updating count */
         smp_wmb();
@@ -332,7 +333,7 @@ ftrace_traceon_count(unsigned long ip, unsigned long parent_ip,
                      struct trace_array *tr, struct ftrace_probe_ops *ops,
                      void *data)
 {
-        update_traceon_count(ops, ip, 1, data);
+        update_traceon_count(ops, ip, tr, 1, data);
 }
 
 static void
@@ -340,7 +341,7 @@ ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip,
                       struct trace_array *tr, struct ftrace_probe_ops *ops,
                       void *data)
 {
-        update_traceon_count(ops, ip, 0, data);
+        update_traceon_count(ops, ip, tr, 0, data);
 }
 
 static void
@@ -348,10 +349,10 @@ ftrace_traceon(unsigned long ip, unsigned long parent_ip,
                struct trace_array *tr, struct ftrace_probe_ops *ops,
                void *data)
 {
-        if (tracing_is_on())
+        if (tracer_tracing_is_on(tr))
                 return;
 
-        tracing_on();
+        tracer_tracing_on(tr);
 }
 
 static void
@@ -359,10 +360,10 @@ ftrace_traceoff(unsigned long ip, unsigned long parent_ip,
                 struct trace_array *tr, struct ftrace_probe_ops *ops,
                 void *data)
 {
-        if (!tracing_is_on())
+        if (!tracer_tracing_is_on(tr))
                 return;
 
-        tracing_off();
+        tracer_tracing_off(tr);
 }
 
 /*