From: Tom Zanussi <tom.zanussi@linux.intel.com>
Date: Fri, 22 Sep 2017 14:58:18 -0500
Subject: [PATCH 04/42] tracing: Remove lookups from tracing_map hitcount
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patches-4.14.1-rt3.tar.xz

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
@@ -428,7 +428,8 @@ static inline struct tracing_map_elt *
 
 		if (test_key && test_key == key_hash && 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;
 		}