From: Tom Zanussi <tom.zanussi@linux.intel.com>
Date: Tue, 5 Sep 2017 16:57:48 -0500
Subject: [PATCH 36/40] tracing: Remove lookups from tracing_map hitcount

Lookups inflate the hitcount, making it essentially useless.  Only
inserts and updates should really affect the hitcount anyway, so
explicitly filter lookups out.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/trace/tracing_map.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -535,7 +535,8 @@ static inline struct tracing_map_elt *
 		if (test_key && test_key == key_hash) {
 			if (entry->val &&
 			    keys_match(key, entry->val->key, map->key_size)) {
-				atomic64_inc(&map->hits);
+				if (!lookup_only)
+					atomic64_inc(&map->hits);
 				return entry->val;
 			} else if (unlikely(!entry->val)) {
 				/*