netdev - [PATCH net/tipc] Replace rcu_swap_protected() with rcu_replace

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Message-ID: <20191210033146.GA32522@paulmck-ThinkPad-P72>
Date:   Mon, 9 Dec 2019 19:31:46 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     jon.maloy@...csson.com, ying.xue@...driver.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net,
        torvalds@...ux-foundation.org, mingo@...nel.org, kernel-team@...com
Subject: [PATCH net/tipc] 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 <torvalds@...ux-foundation.org>
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Ying Xue <ying.xue@...driver.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: <netdev@...r.kernel.org>
Cc: <tipc-discussion@...ts.sourceforge.net>

diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c
index 990a872..64cf831 100644
--- a/net/tipc/crypto.c
+++ b/net/tipc/crypto.c
@@ -258,7 +258,7 @@ static char *tipc_key_change_dump(struct tipc_key old, struct tipc_key new,
 	rcu_dereference_protected((rcu_ptr), lockdep_is_held(lock))
 
 #define tipc_aead_rcu_swap(rcu_ptr, ptr, lock)				\
-	rcu_swap_protected((rcu_ptr), (ptr), lockdep_is_held(lock))
+	rcu_replace_pointer((rcu_ptr), (ptr), lockdep_is_held(lock))
 
 #define tipc_aead_rcu_replace(rcu_ptr, ptr, lock)			\
 do {									\
@@ -1189,7 +1189,7 @@ static bool tipc_crypto_key_try_align(struct tipc_crypto *rx, u8 new_pending)
 
 	/* Move passive key if any */
 	if (key.passive) {
-		tipc_aead_rcu_swap(rx->aead[key.passive], tmp2, &rx->lock);
+		tmp2 = rcu_replace_pointer(rx->aead[key.passive], tmp2, &rx->lock);
 		x = (key.passive - key.pending + new_pending) % KEY_MAX;
 		new_passive = (x <= 0) ? x + KEY_MAX : x;
 	}