net: remove bh disabling around percpu_counter accesses

Shaohua Li made percpu_counter irq safe in commit 098faf5805c8
("percpu_counter: make APIs irq safe")

We can safely remove BH disable/enable sections around various
percpu_counter manipulations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/dst_ops.h

@@ -46,19 +46,12 @@ static inline int dst_entries_get_fast(struct dst_ops *dst)
 
 static inline int dst_entries_get_slow(struct dst_ops *dst)
 {
-	int res;
-
-	local_bh_disable();
-	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
-	local_bh_enable();
-	return res;
+	return percpu_counter_sum_positive(&dst->pcpuc_entries);
 }
 
 static inline void dst_entries_add(struct dst_ops *dst, int val)
 {
-	local_bh_disable();
 	percpu_counter_add(&dst->pcpuc_entries, val);
-	local_bh_enable();
 }
 
 static inline int dst_entries_init(struct dst_ops *dst)

include/net/inet_frag.h

@@ -164,13 +164,7 @@ static inline void add_frag_mem_limit(struct netns_frags *nf, int i)
 
 static inline unsigned int sum_frag_mem_limit(struct netns_frags *nf)
 {
-	unsigned int res;
-
-	local_bh_disable();
-	res = percpu_counter_sum_positive(&nf->mem);
-	local_bh_enable();
-
-	return res;
+	return percpu_counter_sum_positive(&nf->mem);
 }
 
 /* RFC 3168 support :

net/ipv4/inet_connection_sock.c

@@ -836,9 +836,8 @@ void inet_csk_destroy_sock(struct sock *sk)
 
 	sk_refcnt_debug_release(sk);
 
-	local_bh_disable();
 	percpu_counter_dec(sk->sk_prot->orphan_count);
-	local_bh_enable();
+
 	sock_put(sk);
 }
 EXPORT_SYMBOL(inet_csk_destroy_sock);

net/ipv4/proc.c

@@ -57,10 +57,8 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
 	unsigned int frag_mem;
 	int orphans, sockets;
 
-	local_bh_disable();
 	orphans = percpu_counter_sum_positive(&tcp_orphan_count);
 	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
-	local_bh_enable();
 
 	socket_seq_show(seq);
 	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",

net/ipv4/tcp.c

@@ -420,9 +420,7 @@ void tcp_init_sock(struct sock *sk)
 	sk->sk_sndbuf = sysctl_tcp_wmem[1];
 	sk->sk_rcvbuf = sysctl_tcp_rmem[1];
 
-	local_bh_disable();
 	sk_sockets_allocated_inc(sk);
-	local_bh_enable();
 }
 EXPORT_SYMBOL(tcp_init_sock);
 

net/ipv4/tcp_ipv4.c

@@ -1887,9 +1887,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
 	tcp_free_fastopen_req(tp);
 	tcp_saved_syn_free(tp);
 
-	local_bh_disable();
 	sk_sockets_allocated_dec(sk);
-	local_bh_enable();
 }
 EXPORT_SYMBOL(tcp_v4_destroy_sock);