diff options
author | Eric Dumazet <dada1@cosmosbay.com> | 2005-12-22 20:49:22 (GMT) |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2006-01-03 21:11:15 (GMT) |
commit | 90ddc4f0470427df306f308ad03db6b6b21644b8 (patch) | |
tree | f97c1d57b25585394ebbd4b42b8d42a339f98644 /net/bluetooth | |
parent | 77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff) | |
download | linux-fsl-qoriq-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.xz |
[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.c | 2 | ||||
-rw-r--r-- | net/bluetooth/cmtp/sock.c | 2 | ||||
-rw-r--r-- | net/bluetooth/hci_sock.c | 2 | ||||
-rw-r--r-- | net/bluetooth/hidp/sock.c | 2 | ||||
-rw-r--r-- | net/bluetooth/l2cap.c | 4 | ||||
-rw-r--r-- | net/bluetooth/rfcomm/sock.c | 4 | ||||
-rw-r--r-- | net/bluetooth/sco.c | 4 |
7 files changed, 10 insertions, 10 deletions
diff --git a/net/bluetooth/bnep/sock.c b/net/bluetooth/bnep/sock.c index 9778c6a..ccbaf69 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 beb045b..5e22343 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 1d6d0a1..84e6c93 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 f8986f8..8f8dd93 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 95f33cc..7f0781e 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 6c34261..757d2dd 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 6481814..6b61323 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, |