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authorEric Dumazet <dada1@cosmosbay.com>2005-12-22 15:49:22 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-03 16:11:15 -0500
commit90ddc4f0470427df306f308ad03db6b6b21644b8 (patch)
treef97c1d57b25585394ebbd4b42b8d42a339f98644 /net/appletalk/ddp.c
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/appletalk/ddp.c')
-rw-r--r--net/appletalk/ddp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 7982656b9c83..296f186802ff 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -63,7 +63,7 @@
63#include <linux/atalk.h> 63#include <linux/atalk.h>
64 64
65struct datalink_proto *ddp_dl, *aarp_dl; 65struct datalink_proto *ddp_dl, *aarp_dl;
66static struct proto_ops atalk_dgram_ops; 66static const struct proto_ops atalk_dgram_ops;
67 67
68/**************************************************************************\ 68/**************************************************************************\
69* * 69* *
@@ -1841,7 +1841,7 @@ static struct net_proto_family atalk_family_ops = {
1841 .owner = THIS_MODULE, 1841 .owner = THIS_MODULE,
1842}; 1842};
1843 1843
1844static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { 1844static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
1845 .family = PF_APPLETALK, 1845 .family = PF_APPLETALK,
1846 .owner = THIS_MODULE, 1846 .owner = THIS_MODULE,
1847 .release = atalk_release, 1847 .release = atalk_release,