linux-kernel - [PATCH 5/6] net/ipv4: Update ip_tunnel_metadata

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Message-Id: <20180326210929.5244-6-dave@stgolabs.net>
Date:   Mon, 26 Mar 2018 14:09:28 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     peterz@...radead.org, mingo@...nel.org, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 5/6] net/ipv4: Update ip_tunnel_metadata_cnt static key to modern api

No changes in refcount semantics -- key init is false; replace

static_key_slow_inc|dec   with   static_branch_inc|dec
static_key_false          with   static_branch_unlikely

Added a '_key' suffix to i2c_trace_msg, for better self
documentation.

Cc: David S. Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 include/net/ip_tunnels.h  | 4 ++--
 net/ipv4/ip_tunnel_core.c | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 540a4b4417bf..fc494b48a64a 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -466,12 +466,12 @@ static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstat
 	return (struct ip_tunnel_info *)lwtstate->data;
 }
 
-extern struct static_key ip_tunnel_metadata_cnt;
+DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
 
 /* Returns > 0 if metadata should be collected */
 static inline int ip_tunnel_collect_metadata(void)
 {
-	return static_key_false(&ip_tunnel_metadata_cnt);
+	return static_branch_unlikely(&ip_tunnel_metadata_cnt);
 }
 
 void __init ip_tunnel_core_init(void);
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 2f39479be92f..dde671e97829 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -423,17 +423,17 @@ void __init ip_tunnel_core_init(void)
 	lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
 }
 
-struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
+DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
 
 void ip_tunnel_need_metadata(void)
 {
-	static_key_slow_inc(&ip_tunnel_metadata_cnt);
+	static_branch_inc(&ip_tunnel_metadata_cnt);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
 
 void ip_tunnel_unneed_metadata(void)
 {
-	static_key_slow_dec(&ip_tunnel_metadata_cnt);
+	static_branch_dec(&ip_tunnel_metadata_cnt);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
-- 
2.13.6