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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/atm/pvc.c
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
downloadlinux-stericsson-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/atm/pvc.c')
-rw-r--r--net/atm/pvc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/atm/pvc.c b/net/atm/pvc.c
index 2684a92da22b..f2c541774dcd 100644
--- a/net/atm/pvc.c
+++ b/net/atm/pvc.c
@@ -102,7 +102,7 @@ static int pvc_getname(struct socket *sock,struct sockaddr *sockaddr,
}
-static struct proto_ops pvc_proto_ops = {
+static const struct proto_ops pvc_proto_ops = {
.family = PF_ATMPVC,
.owner = THIS_MODULE,