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net: Add comment that early_demux can change via sysctl

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Twice patches trying to constify inet{6}_protocol have been reverted:
39294c3df2 ("Revert "ipv6: constify inet6_protocol structures"") to
revert 3a3a4e3054 and then 03157937fe ("Revert "ipv4: make
net_protocol const"") to revert aa8db499ea.

Add a comment that the structures can not be const because the
early_demux field can change based on a sysctl.

Signed-off-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Ahern 2017-08-28 15:14:20 -07:00 • committed by David S. Miller
commit a8e3bb347d
3 changed files with 12 additions and 0 deletions
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3
net/ipv6/tcp_ipv6.c
View file

@ -1949,6 +1949,9 @@ struct proto tcpv6_prot = {
.diag_destroy = tcp_abort,
};
/* thinking of making this const? Don't.
* early_demux can change based on sysctl.
*/
static struct inet6_protocol tcpv6_protocol = {
.early_demux = tcp_v6_early_demux,
.early_demux_handler = tcp_v6_early_demux,

3
net/ipv6/udp.c
View file

@ -1472,6 +1472,9 @@ int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
}
#endif
/* thinking of making this const? Don't.
* early_demux can change based on sysctl.
*/
static struct inet6_protocol udpv6_protocol = {
.early_demux = udp_v6_early_demux,
.early_demux_handler = udp_v6_early_demux,