aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/ipv6.h
diff options
context:
space:
mode:
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 /include/net/ipv6.h
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 'include/net/ipv6.h')
-rw-r--r--include/net/ipv6.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index e3d5d7bc8837..11a725662c36 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -538,8 +538,8 @@ extern int sysctl_ip6frag_low_thresh;
538extern int sysctl_ip6frag_time; 538extern int sysctl_ip6frag_time;
539extern int sysctl_ip6frag_secret_interval; 539extern int sysctl_ip6frag_secret_interval;
540 540
541extern struct proto_ops inet6_stream_ops; 541extern const struct proto_ops inet6_stream_ops;
542extern struct proto_ops inet6_dgram_ops; 542extern const struct proto_ops inet6_dgram_ops;
543 543
544extern int ip6_mc_source(int add, int omode, struct sock *sk, 544extern int ip6_mc_source(int add, int omode, struct sock *sk,
545 struct group_source_req *pgsr); 545 struct group_source_req *pgsr);