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/wanrouter/af_wanpipe.c
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@ -181,7 +181,7 @@ struct wanpipe_opt
#endif
static int sk_count;
extern struct proto_ops wanpipe_ops;
extern const struct proto_ops wanpipe_ops;
static unsigned long find_free_critical;
static void wanpipe_unlink_driver(struct sock *sk);
@ -2546,7 +2546,7 @@ static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr
return 0;
}
struct proto_ops wanpipe_ops = {
const struct proto_ops wanpipe_ops = {
.family = PF_WANPIPE,
.owner = THIS_MODULE,
.release = wanpipe_release,