aboutsummaryrefslogtreecommitdiffstats
path: root/net/bluetooth/l2cap.c
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 /net/bluetooth/l2cap.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/bluetooth/l2cap.c')
-rw-r--r--net/bluetooth/l2cap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 95f33cc7a24e..7f0781e4326f 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -57,7 +57,7 @@
57 57
58#define VERSION "2.8" 58#define VERSION "2.8"
59 59
60static struct proto_ops l2cap_sock_ops; 60static const struct proto_ops l2cap_sock_ops;
61 61
62static struct bt_sock_list l2cap_sk_list = { 62static struct bt_sock_list l2cap_sk_list = {
63 .lock = RW_LOCK_UNLOCKED 63 .lock = RW_LOCK_UNLOCKED
@@ -2161,7 +2161,7 @@ static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
2161 2161
2162static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL); 2162static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
2163 2163
2164static struct proto_ops l2cap_sock_ops = { 2164static const struct proto_ops l2cap_sock_ops = {
2165 .family = PF_BLUETOOTH, 2165 .family = PF_BLUETOOTH,
2166 .owner = THIS_MODULE, 2166 .owner = THIS_MODULE,
2167 .release = l2cap_sock_release, 2167 .release = l2cap_sock_release,