linux-kernel - [PATCH] net: batman-adv: Use built-in RCU list checking

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Date:   Sun, 16 Feb 2020 20:17:18 +0530
From:   madhuparnabhowmik10@...il.com
To:     mareklindner@...mailbox.ch, sw@...onwunderlich.de, a@...table.cc,
        sven@...fation.org, davem@...emloft.net
Cc:     b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, joel@...lfernandes.org,
        frextrite@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Subject: [PATCH] net: batman-adv: Use built-in RCU list checking

From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>

hlist_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to hlist_for_each_entry_rcu() to silence
false lockdep warnings when CONFIG_PROVE_RCU_LIST is enabled
by default.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
---
 net/batman-adv/translation-table.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 8a482c5ec67b..0e3c31cbe0e8 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -862,7 +862,8 @@ batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 	u8 *tt_change_ptr;
 
 	spin_lock_bh(&orig_node->vlan_list_lock);
-	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list,
+				lockdep_is_held(&orig_node->vlan_list_lock)) {
 		num_vlan++;
 		num_entries += atomic_read(&vlan->tt.num_entries);
 	}
@@ -888,7 +889,8 @@ batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 	(*tt_data)->num_vlan = htons(num_vlan);
 
 	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
-	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+	hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list,
+				lockdep_is_held(&orig_node->vlan_list_lock)) {
 		tt_vlan->vid = htons(vlan->vid);
 		tt_vlan->crc = htonl(vlan->tt.crc);
 
@@ -937,7 +939,8 @@ batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 	int change_offset;
 
 	spin_lock_bh(&bat_priv->softif_vlan_list_lock);
-	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list,
+				lockdep_is_held(&bat_priv->softif_vlan_list_lock)) {
 		vlan_entries = atomic_read(&vlan->tt.num_entries);
 		if (vlan_entries < 1)
 			continue;
@@ -967,7 +970,8 @@ batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 	(*tt_data)->num_vlan = htons(num_vlan);
 
 	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
-	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list,
+				lockdep_is_held(&bat_priv->softif_vlan_list_lock)) {
 		vlan_entries = atomic_read(&vlan->tt.num_entries);
 		if (vlan_entries < 1)
 			continue;
-- 
2.17.1