From 543ede7e3eaac62c14a061296722839829b0cef8 Mon Sep 17 00:00:00 2001
From: Jarno Rajahalme <jrajahalme@nicira.com>
Date: Wed, 19 Mar 2014 08:51:52 -0700
Subject: [PATCH] lib/hmap: Remove the memory fence from hmap_is_empty().

The fence made classifier_lookup() slower.  Access to a size_t 'n' is
safe without synchonizing, and if racing with writers matters,
additional syncronization primitives are used anyway.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
---
 lib/hmap.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/hmap.h b/lib/hmap.h
index 445e74f0b..9fb83d5ab 100644
--- a/lib/hmap.h
+++ b/lib/hmap.h
@@ -196,7 +196,6 @@ hmap_capacity(const struct hmap *hmap)
 static inline bool
 hmap_is_empty(const struct hmap *hmap)
 {
-    atomic_thread_fence(memory_order_acquire);
     return hmap->n == 0;
 }
 
-- 
2.47.0