net/core: Replace rcu_swap_protected() with rcu_replace_pointer()

This commit replaces the use of rcu_swap_protected() with the more
intuitively appealing rcu_replace_pointer() as a step towards removing
rcu_swap_protected().

Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@mail.gmail.com/
Reported-by: Linus Torvalds <[email protected]>
[ paulmck: From rcu_replace() to rcu_replace_pointer() per Ingo Molnar. ]
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Jiri Pirko <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Ido Schimmel <[email protected]>
Cc: Petr Machata <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: <[email protected]>

Author: paulmckrcu

net/core/dev.c

@@ -1288,8 +1288,8 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
 	}
 
 	mutex_lock(&ifalias_mutex);
-	rcu_swap_protected(dev->ifalias, new_alias,
-			   mutex_is_locked(&ifalias_mutex));
+	new_alias = rcu_replace_pointer(dev->ifalias, new_alias,
+					mutex_is_locked(&ifalias_mutex));
 	mutex_unlock(&ifalias_mutex);
 
 	if (new_alias)

net/core/sock_reuseport.c

@@ -356,8 +356,8 @@ int reuseport_detach_prog(struct sock *sk)
 	spin_lock_bh(&reuseport_lock);
 	reuse = rcu_dereference_protected(sk->sk_reuseport_cb,
 					  lockdep_is_held(&reuseport_lock));
-	rcu_swap_protected(reuse->prog, old_prog,
-			   lockdep_is_held(&reuseport_lock));
+	old_prog = rcu_replace_pointer(reuse->prog, old_prog,
+				       lockdep_is_held(&reuseport_lock));
 	spin_unlock_bh(&reuseport_lock);
 
 	if (!old_prog)