net: Update netstamp_needed 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 netstamp_needed, for better self
documentation.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index ad4288f..d6fd157 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1786,7 +1786,7 @@ void net_dec_egress_queue(void)
 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
 #endif
 
-static struct static_key netstamp_needed __read_mostly;
+static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key);
 #ifdef HAVE_JUMP_LABEL
 static atomic_t netstamp_needed_deferred;
 static atomic_t netstamp_wanted;
@@ -1797,9 +1797,9 @@ static void netstamp_clear(struct work_struct *work)
 
        wanted = atomic_add_return(deferred, &netstamp_wanted);
        if (wanted > 0)
-               static_key_enable(&netstamp_needed);
+               static_branch_enable(&netstamp_needed_key);
        else
-               static_key_disable(&netstamp_needed);
+               static_branch_disable(&netstamp_needed_key);
 }
 static DECLARE_WORK(netstamp_work, netstamp_clear);
 #endif
@@ -1819,7 +1819,7 @@ void net_enable_timestamp(void)
        atomic_inc(&netstamp_needed_deferred);
        schedule_work(&netstamp_work);
 #else
-       static_key_slow_inc(&netstamp_needed);
+       static_branch_inc(&netstamp_needed_key);
 #endif
 }
 EXPORT_SYMBOL(net_enable_timestamp);
@@ -1839,7 +1839,7 @@ void net_disable_timestamp(void)
        atomic_dec(&netstamp_needed_deferred);
        schedule_work(&netstamp_work);
 #else
-       static_key_slow_dec(&netstamp_needed);
+       static_branch_dec(&netstamp_needed_key);
 #endif
 }
 EXPORT_SYMBOL(net_disable_timestamp);
@@ -1847,15 +1847,15 @@ EXPORT_SYMBOL(net_disable_timestamp);
 static inline void net_timestamp_set(struct sk_buff *skb)
 {
        skb->tstamp = 0;
-       if (static_key_false(&netstamp_needed))
+       if (static_branch_unlikely(&netstamp_needed_key))
                __net_timestamp(skb);
 }
 
-#define net_timestamp_check(COND, SKB)                 \
-       if (static_key_false(&netstamp_needed)) {               \
-               if ((COND) && !(SKB)->tstamp)   \
-                       __net_timestamp(SKB);           \
-       }                                               \
+#define net_timestamp_check(COND, SKB)                         \
+       if (static_branch_unlikely(&netstamp_needed_key)) {     \
+               if ((COND) && !(SKB)->tstamp)                   \
+                       __net_timestamp(SKB);                   \
+       }                                                       \
 
 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
 {