tracing: Only have rmmod clear buffers that its events were active in

Currently, when a module event is enabled, when that module is removed, it
clears all ring buffers. This is to prevent another module from being loaded
and having one of its trace event IDs from reusing a trace event ID of the
removed module. This could cause undesirable effects as the trace event of
the new module would be using its own processing algorithms to process raw
data of another event. To prevent this, when a module is loaded, if any of
its events have been used (signified by the WAS_ENABLED event call flag,
which is never cleared), all ring buffers are cleared, just in case any one
of them contains event data of the removed event.

The problem is, there's no reason to clear all ring buffers if only one (or
less than all of them) uses one of the events. Instead, only clear the ring
buffers that recorded the events of a module that is being removed.

To do this, instead of keeping the WAS_ENABLED flag with the trace event
call, move it to the per instance (per ring buffer) event file descriptor.
The event file descriptor maps each event to a separate ring buffer
instance. Then when the module is removed, only the ring buffers that
activated one of the module's events get cleared. The rest are not touched.

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

1 files changed, 7 insertions, 8 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 36132f9280e6..c93540c5df21 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -466,7 +466,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
 			set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags);
 
 			/* WAS_ENABLED gets set but never cleared. */
-			call->flags |= TRACE_EVENT_FL_WAS_ENABLED;
+			set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags);
 		}
 		break;
 	}
@@ -2058,6 +2058,10 @@ static void event_remove(struct trace_event_call *call)
 	do_for_each_event_file(tr, file) {
 		if (file->event_call != call)
 			continue;
+
+		if (file->flags & EVENT_FILE_FL_WAS_ENABLED)
+			tr->clear_trace = true;
+
 		ftrace_event_enable_disable(file, 0);
 		/*
 		 * The do_for_each_event_file() is
@@ -2396,15 +2400,11 @@ static void trace_module_add_events(struct module *mod)
 static void trace_module_remove_events(struct module *mod)
 {
 	struct trace_event_call *call, *p;
-	bool clear_trace = false;
 
 	down_write(&trace_event_sem);
 	list_for_each_entry_safe(call, p, &ftrace_events, list) {
-		if (call->mod == mod) {
-			if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
-				clear_trace = true;
+		if (call->mod == mod)
 			__trace_remove_event_call(call);
-		}
 	}
 	up_write(&trace_event_sem);
 
@@ -2416,8 +2416,7 @@ static void trace_module_remove_events(struct module *mod)
 	 * over from this module may be passed to the new module events and
 	 * unexpected results may occur.
 	 */
-	if (clear_trace)
-		tracing_reset_all_online_cpus();
+	tracing_reset_all_online_cpus();
 }
 
 static int trace_module_notify(struct notifier_block *self,