[PATCH 07/37] netfilter: Replace call_rcu_bh(), rcu_barrier_bh(), and synchronize_rcu_bh()

[Pablo Neira Ayuso]

From: "Paul E. McKenney" <paul...@linux.ibm.com>

Now that call_rcu()'s callback is not invoked until after bh-disable
regions of code have completed (in addition to explicitly marked
RCU read-side critical sections), call_rcu() can be used in place
of call_rcu_bh().  Similarly, rcu_barrier() can be used in place of
rcu_barrier_bh() and synchronize_rcu() in place of synchronize_rcu_bh().
This commit therefore makes these changes.

Signed-off-by: Paul E. McKenney <paul...@linux.ibm.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/ipv4/netfilter/ipt_CLUSTERIP.c    | 6 +++---
 net/netfilter/ipset/ip_set_hash_gen.h | 4 ++--
 net/netfilter/nfnetlink_log.c         | 2 +-
 net/netfilter/xt_hashlimit.c          | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c 
b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 2c8d313ae216..5b0c1ee6ae26 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -94,7 +94,7 @@ static inline void
 clusterip_config_put(struct clusterip_config *c)
 {
        if (refcount_dec_and_test(&c->refcount))
-               call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
+               call_rcu(&c->rcu, clusterip_config_rcu_free);
 }
 
 /* decrease the count of entries using/referencing this config.  If last
@@ -876,8 +876,8 @@ static void __exit clusterip_tg_exit(void)
        xt_unregister_target(&clusterip_tg_reg);
        unregister_pernet_subsys(&clusterip_net_ops);
 
-       /* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */
-       rcu_barrier_bh();
+       /* Wait for completion of call_rcu()'s (clusterip_config_rcu_free) */
+       rcu_barrier();
 }
 
 module_init(clusterip_tg_init);
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h 
b/net/netfilter/ipset/ip_set_hash_gen.h
index e287da68d5fa..2c9609929c71 100644
--- a/net/netfilter/ipset/ip_set_hash_gen.h
+++ b/net/netfilter/ipset/ip_set_hash_gen.h
@@ -67,7 +67,7 @@ tune_ahash_max(u8 curr, u32 multi)
 
 /* A hash bucket */
 struct hbucket {
-       struct rcu_head rcu;    /* for call_rcu_bh */
+       struct rcu_head rcu;    /* for call_rcu */
        /* Which positions are used in the array */
        DECLARE_BITMAP(used, AHASH_MAX_TUNED);
        u8 size;                /* size of the array */
@@ -664,7 +664,7 @@ mtype_resize(struct ip_set *set, bool retried)
        spin_unlock_bh(&set->lock);
 
        /* Give time to other readers of the set */
-       synchronize_rcu_bh();
+       synchronize_rcu();
 
        pr_debug("set %s resized from %u (%p) to %u (%p)\n", set->name,
                 orig->htable_bits, orig, t->htable_bits, t);
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 332c69d27b47..b1f9c5303f02 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -148,7 +148,7 @@ static void
 instance_put(struct nfulnl_instance *inst)
 {
        if (inst && refcount_dec_and_test(&inst->use))
-               call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
+               call_rcu(&inst->rcu, nfulnl_instance_free_rcu);
 }
 
 static void nfulnl_timer(struct timer_list *t);
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 3e7d259e5d8d..8138b68a9a44 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -260,7 +260,7 @@ static inline void
 dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent)
 {
        hlist_del_rcu(&ent->node);
-       call_rcu_bh(&ent->rcu, dsthash_free_rcu);
+       call_rcu(&ent->rcu, dsthash_free_rcu);
        ht->count--;
 }
 static void htable_gc(struct work_struct *work);
@@ -1329,7 +1329,7 @@ static void __exit hashlimit_mt_exit(void)
        xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg));
        unregister_pernet_subsys(&hashlimit_net_ops);
 
-       rcu_barrier_bh();
+       rcu_barrier();
        kmem_cache_destroy(hashlimit_cachep);
 }
 
-- 
2.11.0