net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited

Use the more common dynamic_debug capable net_dbg_ratelimited
and remove the LIMIT_NETDEBUG macro.

All messages are still ratelimited.

Some KERN_<LEVEL> uses are changed to KERN_DEBUG.

This may have some negative impact on messages that were
emitted at KERN_INFO that are not not enabled at all unless
DEBUG is defined or dynamic_debug is enabled.  Even so,
these messages are now _not_ emitted by default.

This also eliminates the use of the net_msg_warn sysctl
"/proc/sys/net/core/warnings".  For backward compatibility,
the sysctl is not removed, but it has no function.  The extern
declaration of net_msg_warn is removed from sock.h and made
static in net/core/sysctl_net_core.c

Miscellanea:

o Update the sysctl documentation
o Remove the embedded uses of pr_fmt
o Coalesce format fragments
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 6d16eb0e0c7f..8ab1989198f6 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -272,10 +272,9 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
                                 ipv6_rearrange_destopt(iph, exthdr.opth);
                 case NEXTHDR_HOP:
                         if (!zero_out_mutable_opts(exthdr.opth)) {
-                                LIMIT_NETDEBUG(
-                                        KERN_WARNING "overrun %sopts\n",
-                                        nexthdr == NEXTHDR_HOP ?
-                                                "hop" : "dest");
+                                net_dbg_ratelimited("overrun %sopts\n",
+                                                    nexthdr == NEXTHDR_HOP ?
+                                                    "hop" : "dest");
                                 return -EINVAL;
                         }
                         break;