[NET]: move struct proto_ops to const
I noticed that some of 'struct proto_ops' used in the kernel may share
a cache line used by locks or other heavily modified data. (default
linker alignement is 32 bytes, and L1_CACHE_LINE is 64 or 128 at
least)
This patch makes sure a 'struct proto_ops' can be declared as const,
so that all cpus can share all parts of it without false sharing.
This is not mandatory : a driver can still use a read/write structure
if it needs to (and eventually a __read_mostly)
I made a global stubstitute to change all existing occurences to make
them const.
This should reduce the possibility of false sharing on SMP, and
speedup some socket system calls.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 6c34261..757d2dd 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -58,7 +58,7 @@
#define BT_DBG(D...)
#endif
-static struct proto_ops rfcomm_sock_ops;
+static const struct proto_ops rfcomm_sock_ops;
static struct bt_sock_list rfcomm_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -907,7 +907,7 @@
static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
-static struct proto_ops rfcomm_sock_ops = {
+static const struct proto_ops rfcomm_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = rfcomm_sock_release,