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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/bluetooth
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
downloadblackbird-op-linux-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.gz
blackbird-op-linux-90ddc4f0470427df306f308ad03db6b6b21644b8.zip
[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')
-rw-r--r--net/bluetooth/bnep/sock.c2
-rw-r--r--net/bluetooth/cmtp/sock.c2
-rw-r--r--net/bluetooth/hci_sock.c2
-rw-r--r--net/bluetooth/hidp/sock.c2
-rw-r--r--net/bluetooth/l2cap.c4
-rw-r--r--net/bluetooth/rfcomm/sock.c4
-rw-r--r--net/bluetooth/sco.c4
7 files changed, 10 insertions, 10 deletions
diff --git a/net/bluetooth/bnep/sock.c b/net/bluetooth/bnep/sock.c
index 9778c6acd53b..ccbaf69afc5b 100644
--- a/net/bluetooth/bnep/sock.c
+++ b/net/bluetooth/bnep/sock.c
@@ -146,7 +146,7 @@ static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return 0;
}
-static struct proto_ops bnep_sock_ops = {
+static const struct proto_ops bnep_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = bnep_sock_release,
diff --git a/net/bluetooth/cmtp/sock.c b/net/bluetooth/cmtp/sock.c
index beb045bf5714..5e22343b6090 100644
--- a/net/bluetooth/cmtp/sock.c
+++ b/net/bluetooth/cmtp/sock.c
@@ -137,7 +137,7 @@ static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return -EINVAL;
}
-static struct proto_ops cmtp_sock_ops = {
+static const struct proto_ops cmtp_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = cmtp_sock_release,
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 1d6d0a15c099..84e6c93a044a 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -575,7 +575,7 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char
return 0;
}
-static struct proto_ops hci_sock_ops = {
+static const struct proto_ops hci_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = hci_sock_release,
diff --git a/net/bluetooth/hidp/sock.c b/net/bluetooth/hidp/sock.c
index f8986f881431..8f8dd931b294 100644
--- a/net/bluetooth/hidp/sock.c
+++ b/net/bluetooth/hidp/sock.c
@@ -143,7 +143,7 @@ static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return -EINVAL;
}
-static struct proto_ops hidp_sock_ops = {
+static const struct proto_ops hidp_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = hidp_sock_release,
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 @@
#define VERSION "2.8"
-static struct proto_ops l2cap_sock_ops;
+static const struct proto_ops l2cap_sock_ops;
static struct bt_sock_list l2cap_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -2161,7 +2161,7 @@ static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
-static struct proto_ops l2cap_sock_ops = {
+static const struct proto_ops l2cap_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = l2cap_sock_release,
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 6c34261b232e..757d2dd3b02f 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -58,7 +58,7 @@
#define BT_DBG(D...)
#endif
-static struct proto_ops rfcomm_sock_ops;
+static const struct proto_ops rfcomm_sock_ops;
static struct bt_sock_list rfcomm_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -907,7 +907,7 @@ static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
-static struct proto_ops rfcomm_sock_ops = {
+static const struct proto_ops rfcomm_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = rfcomm_sock_release,
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 648181430699..6b61323ce23c 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -56,7 +56,7 @@
#define VERSION "0.5"
-static struct proto_ops sco_sock_ops;
+static const struct proto_ops sco_sock_ops;
static struct bt_sock_list sco_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -914,7 +914,7 @@ static ssize_t sco_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
-static struct proto_ops sco_sock_ops = {
+static const struct proto_ops sco_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = sco_sock_release,
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