[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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 40a4c6899051..e4e629ed9bf7 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -680,7 +680,7 @@ void dccp_shutdown(struct sock *sk, int how)
 
 EXPORT_SYMBOL_GPL(dccp_shutdown);
 
-static struct proto_ops inet_dccp_ops = {
+static const struct proto_ops inet_dccp_ops = {
         .family         = PF_INET,
         .owner          = THIS_MODULE,
         .release        = inet_release,