From: Tom Zanussi <tom.zanussi@linux.intel.com>
Date: Mon, 26 Jun 2017 17:49:12 -0500
Subject: tracing: Add post-trigger flag to hist trigger command
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: c98152e269b2d5b8df360d64735950e56b63375d
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

Add EVENT_CMD_FL_POST_TRIGGER to the hist trigger cmd - it doesn't
affect the hist trigger results, and allows further events such as
synthetic events to be generated from a hist trigger.

Without this change, generating an event from a hist trigger will
cause the generated event to fail a ring buffer trace_recursive_lock()
check and return without actually logging the event.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 kernel/trace/trace_events_hist.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1676,7 +1676,7 @@ static int event_hist_trigger_func(struc
 static struct event_command trigger_hist_cmd = {
 	.name			= "hist",
 	.trigger_type		= ETT_EVENT_HIST,
-	.flags			= EVENT_CMD_FL_NEEDS_REC,
+	.flags			= EVENT_CMD_FL_NEEDS_REC | EVENT_CMD_FL_POST_TRIGGER,
 	.func			= event_hist_trigger_func,
 	.reg			= hist_register_trigger,
 	.unreg			= hist_unregister_trigger,