netdev - [PATCH 4/4] batman-adv: replace call_rcu by kfree_rcu for simple kmem_cache

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Message-Id: <20241015073946.46613-5-sw@simonwunderlich.de>
Date: Tue, 15 Oct 2024 09:39:46 +0200
From: Simon Wunderlich <sw@...onwunderlich.de>
To: kuba@...nel.org,
	davem@...emloft.net
Cc: netdev@...r.kernel.org,
	b.a.t.m.a.n@...ts.open-mesh.org,
	Julia Lawall <Julia.Lawall@...ia.fr>,
	Sven Eckelmann <sven@...fation.org>,
	Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 4/4] batman-adv: replace call_rcu by kfree_rcu for simple kmem_cache_free callback

From: Julia Lawall <Julia.Lawall@...ia.fr>

Since SLOB was removed and since
commit 6c6c47b063b5 ("mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy()"),
it is not necessary to use call_rcu when the callback only performs
kmem_cache_free. Use kfree_rcu() directly.

The changes were made using Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
---
 net/batman-adv/translation-table.c | 47 ++----------------------------
 1 file changed, 3 insertions(+), 44 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 6815d1262feb..b44c382226a1 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -209,20 +209,6 @@ batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
 	return tt_global_entry;
 }
 
-/**
- * batadv_tt_local_entry_free_rcu() - free the tt_local_entry
- * @rcu: rcu pointer of the tt_local_entry
- */
-static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
-{
-	struct batadv_tt_local_entry *tt_local_entry;
-
-	tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
-				      common.rcu);
-
-	kmem_cache_free(batadv_tl_cache, tt_local_entry);
-}
-
 /**
  * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue
  *  for free after rcu grace period
@@ -237,7 +223,7 @@ static void batadv_tt_local_entry_release(struct kref *ref)
 
 	batadv_softif_vlan_put(tt_local_entry->vlan);
 
-	call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
+	kfree_rcu(tt_local_entry, common.rcu);
 }
 
 /**
@@ -255,20 +241,6 @@ batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
 		 batadv_tt_local_entry_release);
 }
 
-/**
- * batadv_tt_global_entry_free_rcu() - free the tt_global_entry
- * @rcu: rcu pointer of the tt_global_entry
- */
-static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
-{
-	struct batadv_tt_global_entry *tt_global_entry;
-
-	tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
-				       common.rcu);
-
-	kmem_cache_free(batadv_tg_cache, tt_global_entry);
-}
-
 /**
  * batadv_tt_global_entry_release() - release tt_global_entry from lists and
  *  queue for free after rcu grace period
@@ -283,7 +255,7 @@ void batadv_tt_global_entry_release(struct kref *ref)
 
 	batadv_tt_global_del_orig_list(tt_global_entry);
 
-	call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
+	kfree_rcu(tt_global_entry, common.rcu);
 }
 
 /**
@@ -408,19 +380,6 @@ static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 	batadv_tt_global_size_mod(orig_node, vid, -1);
 }
 
-/**
- * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry
- * @rcu: rcu pointer of the orig_entry
- */
-static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
-{
-	struct batadv_tt_orig_list_entry *orig_entry;
-
-	orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
-
-	kmem_cache_free(batadv_tt_orig_cache, orig_entry);
-}
-
 /**
  * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and
  *  queue for free after rcu grace period
@@ -434,7 +393,7 @@ static void batadv_tt_orig_list_entry_release(struct kref *ref)
 				  refcount);
 
 	batadv_orig_node_put(orig_entry->orig_node);
-	call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
+	kfree_rcu(orig_entry, rcu);
 }
 
 /**
-- 
2.39.5