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authorEric Dumazet <dada1@cosmosbay.com>2005-12-22 12:49:22 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-03 13:11:15 -0800
commit90ddc4f0470427df306f308ad03db6b6b21644b8 (patch)
treef97c1d57b25585394ebbd4b42b8d42a339f98644 /net/ax25
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
downloadop-kernel-dev-90ddc4f0470427df306f308ad03db6b6b21644b8.zip
op-kernel-dev-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.gz
[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>
Diffstat (limited to 'net/ax25')
-rw-r--r--net/ax25/af_ax25.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 1b683f3..8b5d10a 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -54,7 +54,7 @@
HLIST_HEAD(ax25_list);
DEFINE_SPINLOCK(ax25_list_lock);
-static struct proto_ops ax25_proto_ops;
+static const struct proto_ops ax25_proto_ops;
static void ax25_free_sock(struct sock *sk)
{
@@ -1944,7 +1944,7 @@ static struct net_proto_family ax25_family_ops = {
.owner = THIS_MODULE,
};
-static struct proto_ops ax25_proto_ops = {
+static const struct proto_ops ax25_proto_ops = {
.family = PF_AX25,
.owner = THIS_MODULE,
.release = ax25_release,
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