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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/econet
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
[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/econet')
-rw-r--r--net/econet/af_econet.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 34fdac51df96..ff58f49c8b4a 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -45,7 +45,7 @@
#include <asm/uaccess.h>
#include <asm/system.h>
-static struct proto_ops econet_ops;
+static const struct proto_ops econet_ops;
static struct hlist_head econet_sklist;
static DEFINE_RWLOCK(econet_lock);
@@ -698,7 +698,7 @@ static struct net_proto_family econet_family_ops = {
.owner = THIS_MODULE,
};
-static struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
+static const struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
.family = PF_ECONET,
.owner = THIS_MODULE,
.release = econet_release,

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