A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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[NET]: move struct proto_ops to const

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2005-12-22 12:49:22 -08:00 • committed by David S. Miller
commit 90ddc4f047
33 changed files with 66 additions and 66 deletions
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4
net/x25/af_x25.c
View file

@ -64,7 +64,7 @@ int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
HLIST_HEAD(x25_list);
DEFINE_RWLOCK(x25_list_lock);
static struct proto_ops x25_proto_ops;
static const struct proto_ops x25_proto_ops;
static struct x25_address null_x25_address = {" "};
@ -1391,7 +1391,7 @@ static struct net_proto_family x25_family_ops = {
.owner = THIS_MODULE,
};
static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
.family = AF_X25,
.owner = THIS_MODULE,
.release = x25_release,