[net-next,2/2] net: sctp: rework debugging framework to use pr_debug and friends

We should get rid of all own SCTP debug printk macros and use the ones
that the kernel offers anyway instead. This makes the code more readable
and conform to the kernel code, and offers all the features of dynamic
debbuging that pr_debug() et al has, such as only turning on/off portions
of debug messages at runtime through debugfs. The runtime cost of having
CONFIG_DYNAMIC_DEBUG enabled, but none of the debug statements printing,
is negligible [1]. If kernel debugging is completly turned off, then these
statements will also compile into "empty" functions.

While we're at it, we also need to change the Kconfig option as it /now/
only refers to the ifdef'ed code portions in outqueue.c that enable further
debugging/tracing of SCTP transaction fields. Also, since SCTP_ASSERT code
was enabled with this Kconfig option and has now been removed, we
transform those code parts into WARNs resp. where appropriate BUG_ONs so
that those bugs can be more easily detected as probably not many people
have SCTP debugging permanently turned on.

To turn on all SCTP debugging, the following steps are needed:

 # mount -t debugfs none /sys/kernel/debug
 # echo -n 'module sctp +p' > /sys/kernel/debug/dynamic_debug/control

This can be done more fine-grained on a per file, per line basis and others
as described in [2].

 [1] https://www.kernel.org/doc/ols/2009/ols2009-pages-39-46.pdf
 [2] Documentation/dynamic-debug-howto.txt

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
---
 Vlad, Neil, if you think some of those WARN() calls are unnecessary, I can
 remove them and submit a v2. Thanks !

 include/net/sctp/sctp.h  |  75 ---------------------
 net/sctp/Kconfig         |  12 ++--
 net/sctp/associola.c     |  69 +++++++++----------
 net/sctp/chunk.c         |   5 +-
 net/sctp/debug.c         |   4 --
 net/sctp/endpointola.c   |   5 +-
 net/sctp/input.c         |   6 +-
 net/sctp/inqueue.c       |   9 ++-
 net/sctp/ipv6.c          |  21 +++---
 net/sctp/output.c        |  40 +++++------
 net/sctp/outqueue.c      | 160 ++++++++++++++++++++------------------------
 net/sctp/protocol.c      |  48 +++++++-------
 net/sctp/sm_make_chunk.c |  25 +++----
 net/sctp/sm_sideeffect.c |  97 ++++++++++++---------------
 net/sctp/sm_statefuns.c  |  77 +++++++++++++---------
 net/sctp/socket.c        | 168 ++++++++++++++++++++++-------------------------
 net/sctp/transport.c     |  51 +++++++-------
 17 files changed, 389 insertions(+), 483 deletions(-)

On 06/26/2013 01:01 PM, Daniel Borkmann wrote:
> We should get rid of all own SCTP debug printk macros and use the ones
> that the kernel offers anyway instead. This makes the code more readable
> and conform to the kernel code, and offers all the features of dynamic
> debbuging that pr_debug() et al has, such as only turning on/off portions
> of debug messages at runtime through debugfs. The runtime cost of having
> CONFIG_DYNAMIC_DEBUG enabled, but none of the debug statements printing,
> is negligible [1]. If kernel debugging is completly turned off, then these
> statements will also compile into "empty" functions.
>
> While we're at it, we also need to change the Kconfig option as it /now/
> only refers to the ifdef'ed code portions in outqueue.c that enable further
> debugging/tracing of SCTP transaction fields. Also, since SCTP_ASSERT code
> was enabled with this Kconfig option and has now been removed, we
> transform those code parts into WARNs resp. where appropriate BUG_ONs so
> that those bugs can be more easily detected as probably not many people
> have SCTP debugging permanently turned on.
>
> To turn on all SCTP debugging, the following steps are needed:
>
>   # mount -t debugfs none /sys/kernel/debug
>   # echo -n 'module sctp +p' > /sys/kernel/debug/dynamic_debug/control
>
> This can be done more fine-grained on a per file, per line basis and others
> as described in [2].
>
>   [1] https://www.kernel.org/doc/ols/2009/ols2009-pages-39-46.pdf
>   [2] Documentation/dynamic-debug-howto.txt
>
> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
> ---
>   Vlad, Neil, if you think some of those WARN() calls are unnecessary, I can
>   remove them and submit a v2. Thanks !

Some of them are.  I've commented below.  This was a bit of a pain to 
review and it has some changes that are not streight forward conversions 
to use pr_debug (sctp_sendmsg() changes).  It would have been better if 
you took an incremental approach to changing SCTP_DEBUG_PRINTK to use 
pr_debug first, and then possibly switch to
direct usage of pr_debug per file.  Would have been much easier to reivew.

>
>   include/net/sctp/sctp.h  |  75 ---------------------
>   net/sctp/Kconfig         |  12 ++--
>   net/sctp/associola.c     |  69 +++++++++----------
>   net/sctp/chunk.c         |   5 +-
>   net/sctp/debug.c         |   4 --
>   net/sctp/endpointola.c   |   5 +-
>   net/sctp/input.c         |   6 +-
>   net/sctp/inqueue.c       |   9 ++-
>   net/sctp/ipv6.c          |  21 +++---
>   net/sctp/output.c        |  40 +++++------
>   net/sctp/outqueue.c      | 160 ++++++++++++++++++++------------------------
>   net/sctp/protocol.c      |  48 +++++++-------
>   net/sctp/sm_make_chunk.c |  25 +++----
>   net/sctp/sm_sideeffect.c |  97 ++++++++++++---------------
>   net/sctp/sm_statefuns.c  |  77 +++++++++++++---------
>   net/sctp/socket.c        | 168 ++++++++++++++++++++++-------------------------
>   net/sctp/transport.c     |  51 +++++++-------
>   17 files changed, 389 insertions(+), 483 deletions(-)
>
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index e6b95bc..d8e37ec 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -83,16 +83,6 @@
>   #include <net/sctp/structs.h>
>   #include <net/sctp/constants.h>
>
> -
> -/* Set SCTP_DEBUG flag via config if not already set. */
> -#ifndef SCTP_DEBUG
> -#ifdef CONFIG_SCTP_DBG_MSG
> -#define SCTP_DEBUG	1
> -#else
> -#define SCTP_DEBUG      0
> -#endif /* CONFIG_SCTP_DBG */
> -#endif /* SCTP_DEBUG */
> -
>   #ifdef CONFIG_IP_SCTP_MODULE
>   #define SCTP_PROTOSW_FLAG 0
>   #else /* static! */
> @@ -270,61 +260,6 @@ static inline void sctp_max_rto(struct sctp_association *asoc,
>   	}
>   }
>
> -/* Print debugging messages.  */
> -#if SCTP_DEBUG
> -extern int sctp_debug_flag;
> -#define SCTP_DEBUG_PRINTK(fmt, args...)			\
> -do {							\
> -	if (sctp_debug_flag)				\
> -		printk(KERN_DEBUG pr_fmt(fmt), ##args);	\
> -} while (0)
> -#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)		\
> -do {							\
> -	if (sctp_debug_flag)				\
> -		pr_cont(fmt, ##args);			\
> -} while (0)
> -#define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail,			\
> -				 args_lead, addr, args_trail...)	\
> -do {									\
> -	const union sctp_addr *_addr = (addr);				\
> -	if (sctp_debug_flag) {						\
> -		if (_addr->sa.sa_family == AF_INET6) {			\
> -			printk(KERN_DEBUG				\
> -			       pr_fmt(fmt_lead "%pI6" fmt_trail),	\
> -			       args_lead,				\
> -			       &_addr->v6.sin6_addr,			\
> -			       args_trail);				\
> -		} else {						\
> -			printk(KERN_DEBUG				\
> -			       pr_fmt(fmt_lead "%pI4" fmt_trail),	\
> -			       args_lead,				\
> -			       &_addr->v4.sin_addr.s_addr,		\
> -			       args_trail);				\
> -		}							\
> -	}								\
> -} while (0)
> -#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
> -#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
> -
> -#define SCTP_ASSERT(expr, str, func) \
> -	if (!(expr)) { \
> -		SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
> -			str, (#expr), __FILE__, __func__, __LINE__); \
> -		func; \
> -	}
> -
> -#else	/* SCTP_DEBUG */
> -
> -#define SCTP_DEBUG_PRINTK(whatever...)
> -#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
> -#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
> -#define SCTP_ENABLE_DEBUG
> -#define SCTP_DISABLE_DEBUG
> -#define SCTP_ASSERT(expr, str, func)
> -
> -#endif /* SCTP_DEBUG */
> -
> -
>   /*
>    * Macros for keeping a global reference of object allocations.
>    */
> @@ -597,16 +532,6 @@ static inline int param_type2af(__be16 type)
>   	}
>   }
>
> -/* Perform some sanity checks. */
> -static inline int sctp_sanity_check(void)
> -{
> -	SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
> -		    sizeof(((struct sk_buff *)0)->cb),
> -		    "SCTP: ulpevent does not fit in skb!\n", return 0);
> -
> -	return 1;
> -}
> -
>   /* Warning: The following hash functions assume a power of two 'size'. */
>   /* This is the hash function for the SCTP port hash table. */
>   static inline int sctp_phashfn(struct net *net, __u16 lport)
> diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
> index cf48528..d80bf1a 100644
> --- a/net/sctp/Kconfig
> +++ b/net/sctp/Kconfig
> @@ -30,7 +30,8 @@ menuconfig IP_SCTP
>   	  homing at either or both ends of an association."
>
>   	  To compile this protocol support as a module, choose M here: the
> -	  module will be called sctp.
> +	  module will be called sctp. Debug messages are handeled by the
> +	  kernel's dynamic debugging framework.
>
>   	  If in doubt, say N.
>
> @@ -48,13 +49,14 @@ config NET_SCTPPROBE
>           To compile this code as a module, choose M here: the
>           module will be called sctp_probe.
>
> -config SCTP_DBG_MSG
> -	bool "SCTP: Debug messages"
> +config SCTP_DBG_TSNS
> +	bool "SCTP: Debug transactions"
>   	help
> -	  If you say Y, this will enable verbose debugging messages.
> +	  If you say Y, this will enable transaction debugging, visible
> +	  from the kernel's dynamic debugging framework.

This doesn't really describe what this functionality turns on.  I am 
hoping that we can get rid of this wart in the future.

>
>   	  If unsure, say N.  However, if you are running into problems, use
> -	  this option to gather detailed trace information
> +	  this option to gather outqueue trace information.
>
>   config SCTP_DBG_OBJCNT
>   	bool "SCTP: Debug object counts"
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index 9a383a8..6554b87 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -357,7 +357,8 @@ struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep,
>   		goto fail_init;
>
>   	SCTP_DBG_OBJCNT_INC(assoc);
> -	SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc);
> +
> +	pr_debug("Created asoc %p\n", asoc);
>
>   	return asoc;
>
> @@ -455,7 +456,10 @@ void sctp_association_free(struct sctp_association *asoc)
>   /* Cleanup and free up an association. */
>   static void sctp_association_destroy(struct sctp_association *asoc)
>   {
> -	SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return);
> +	if (unlikely(!asoc->base.dead)) {
> +		WARN(1, "Attempt to destroy undead association %p!\n", asoc);
> +		return;
> +	}
>
>   	sctp_endpoint_put(asoc->ep);
>   	sock_put(asoc->base.sk);
> @@ -536,11 +540,9 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc,
>   	struct list_head	*pos;
>   	struct sctp_transport	*transport;
>
> -	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ",
> -				 " port: %d\n",
> -				 asoc,
> -				 (&peer->ipaddr),
> -				 ntohs(peer->ipaddr.v4.sin_port));
> +	pr_debug("%s: association:%p addr:%pIg port:%d\n",
> +		 __func__, asoc, &peer->ipaddr.sa,
> +		 ntohs(peer->ipaddr.v4.sin_port));
>
>   	/* If we are to remove the current retran_path, update it
>   	 * to the next peer before removing this peer from the list.
> @@ -636,12 +638,8 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
>   	/* AF_INET and AF_INET6 share common port field. */
>   	port = ntohs(addr->v4.sin_port);
>
> -	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ",
> -				 " port: %d state:%d\n",
> -				 asoc,
> -				 addr,
> -				 port,
> -				 peer_state);
> +	pr_debug("%s: association:%p addr:%pIg port:%d state:%d\n", __func__,
> +		 asoc, &addr->sa, port, peer_state);
>
>   	/* Set the port if it has not been set yet.  */
>   	if (0 == asoc->peer.port)
> @@ -708,8 +706,9 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
>   	else
>   		asoc->pathmtu = peer->pathmtu;
>
> -	SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to "
> -			  "%d\n", asoc, asoc->pathmtu);
> +	pr_debug("%s: association:%p PMTU set to %d\n", __func__, asoc,
> +		 asoc->pathmtu);
> +
>   	peer->pmtu_pending = 0;
>
>   	asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
> @@ -1349,12 +1348,8 @@ void sctp_assoc_update_retran_path(struct sctp_association *asoc)
>   	else
>   		t = asoc->peer.retran_path;
>
> -	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
> -				 " %p addr: ",
> -				 " port: %d\n",
> -				 asoc,
> -				 (&t->ipaddr),
> -				 ntohs(t->ipaddr.v4.sin_port));
> +	pr_debug("%s: association:%p addr:%pIg port:%d\n", __func__, asoc,
> +		 &t->ipaddr.sa, ntohs(t->ipaddr.v4.sin_port));
>   }
>
>   /* Choose the transport for sending retransmit packet.  */
> @@ -1401,8 +1396,8 @@ void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc)
>   		asoc->frag_point = sctp_frag_point(asoc, pmtu);
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",
> -			  __func__, asoc, asoc->pathmtu, asoc->frag_point);
> +	pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc,
> +		 asoc->pathmtu, asoc->frag_point);
>   }
>
>   /* Should we send a SACK to update our peer? */
> @@ -1454,9 +1449,9 @@ void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len)
>   		asoc->rwnd_press -= change;
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) "
> -			  "- %u\n", __func__, asoc, len, asoc->rwnd,
> -			  asoc->rwnd_over, asoc->a_rwnd);
> +	pr_debug("%s: asoc:%p rwnd increased by %d to (%u, %u) - %u\n",
> +		 __func__, asoc, len, asoc->rwnd, asoc->rwnd_over,
> +		 asoc->a_rwnd);
>
>   	/* Send a window update SACK if the rwnd has increased by at least the
>   	 * minimum of the association's PMTU and half of the receive buffer.
> @@ -1465,9 +1460,11 @@ void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len)
>   	 */
>   	if (sctp_peer_needs_update(asoc)) {
>   		asoc->a_rwnd = asoc->rwnd;
> -		SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p "
> -				  "rwnd: %u a_rwnd: %u\n", __func__,
> -				  asoc, asoc->rwnd, asoc->a_rwnd);
> +
> +		pr_debug("%s: sending window update SACK- asoc:%p rwnd:%u "
> +			 "a_rwnd:%u\n", __func__, asoc, asoc->rwnd,
> +			 asoc->a_rwnd);
> +
>   		sack = sctp_make_sack(asoc);
>   		if (!sack)
>   			return;
> @@ -1489,8 +1486,11 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len)
>   	int rx_count;
>   	int over = 0;
>
> -	SCTP_ASSERT(asoc->rwnd, "rwnd zero", return);
> -	SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return);
> +	if (unlikely(!asoc->rwnd || asoc->rwnd_over)) {
> +		WARN(1, "Association %p has asoc->rwnd:%u, asoc->rwnd_over:%u!\n",
> +		     asoc, asoc->rwnd, asoc->rwnd_over);
> +		return;
> +	}

I think this warning is likely to kick under heavy usage.  I think 
converting it to pr_debug should be sufficient.

>
>   	if (asoc->ep->rcvbuf_policy)
>   		rx_count = atomic_read(&asoc->rmem_alloc);
> @@ -1515,9 +1515,10 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len)
>   		asoc->rwnd_over = len - asoc->rwnd;
>   		asoc->rwnd = 0;
>   	}
> -	SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u, %u)\n",
> -			  __func__, asoc, len, asoc->rwnd,
> -			  asoc->rwnd_over, asoc->rwnd_press);
> +
> +	pr_debug("%s: asoc:%p rwnd decreased by %d to (%u, %u, %u)\n",
> +		 __func__, asoc, len, asoc->rwnd, asoc->rwnd_over,
> +		 asoc->rwnd_press);
>   }
>
>   /* Build the bind address list for the association based on info from the
> diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
> index 7135fc0..5780565 100644
> --- a/net/sctp/chunk.c
> +++ b/net/sctp/chunk.c
> @@ -193,8 +193,9 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
>   		msg->expires_at = jiffies +
>   				    msecs_to_jiffies(sinfo->sinfo_timetolive);
>   		msg->can_abandon = 1;
> -		SCTP_DEBUG_PRINTK("%s: msg:%p expires_at: %ld jiffies:%ld\n",
> -				  __func__, msg, msg->expires_at, jiffies);
> +
> +		pr_debug("%s: msg:%p expires_at:%ld jiffies:%ld\n", __func__,
> +			 msg, msg->expires_at, jiffies);
>   	}
>
>   	/* This is the biggest possible DATA chunk that can fit into
> diff --git a/net/sctp/debug.c b/net/sctp/debug.c
> index ec997cf..f499878 100644
> --- a/net/sctp/debug.c
> +++ b/net/sctp/debug.c
> @@ -47,10 +47,6 @@
>
>   #include <net/sctp/sctp.h>
>
> -#if SCTP_DEBUG
> -int sctp_debug_flag = 1;	/* Initially enable DEBUG */
> -#endif	/* SCTP_DEBUG */
> -
>   /* These are printable forms of Chunk ID's from section 3.1.  */
>   static const char *const sctp_cid_tbl[SCTP_NUM_BASE_CHUNK_TYPES] = {
>   	"DATA",
> diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
> index b26999d..9e3d257 100644
> --- a/net/sctp/endpointola.c
> +++ b/net/sctp/endpointola.c
> @@ -249,7 +249,10 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
>   {
>   	struct sock *sk;
>
> -	SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
> +	if (unlikely(!ep->base.dead)) {
> +		WARN(1, "Attempt to destroy undead endpoint %p!\n", ep);
> +		return;
> +	}
>
>   	/* Free the digest buffer */
>   	kfree(ep->digest);
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index 4cfc746..3fa4d85 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -454,8 +454,6 @@ void sctp_icmp_proto_unreachable(struct sock *sk,
>   			   struct sctp_association *asoc,
>   			   struct sctp_transport *t)
>   {
> -	SCTP_DEBUG_PRINTK("%s\n",  __func__);
> -
>   	if (sock_owned_by_user(sk)) {
>   		if (timer_pending(&t->proto_unreach_timer))
>   			return;
> @@ -464,10 +462,12 @@ void sctp_icmp_proto_unreachable(struct sock *sk,
>   						jiffies + (HZ/20)))
>   				sctp_association_hold(asoc);
>   		}
> -			
>   	} else {
>   		struct net *net = sock_net(sk);
>
> +		pr_debug("%s: unrecognized next header type "
> +			 "encountered!\n", __func__);
> +
>   		if (del_timer(&t->proto_unreach_timer))
>   			sctp_association_put(asoc);
>
> diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
> index 3221d07..8bbc8cc 100644
> --- a/net/sctp/inqueue.c
> +++ b/net/sctp/inqueue.c
> @@ -219,10 +219,10 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
>   		chunk->end_of_packet = 1;
>   	}
>
> -	SCTP_DEBUG_PRINTK("+++sctp_inq_pop+++ chunk %p[%s],"
> -			  " length %d, skb->len %d\n",chunk,
> -			  sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)),
> -			  ntohs(chunk->chunk_hdr->length), chunk->skb->len);
> +	pr_debug("+++sctp_inq_pop+++ chunk:%p[%s], length:%d, skb->len:%d\n",
> +		 chunk, sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)),
> +		 ntohs(chunk->chunk_hdr->length), chunk->skb->len);
> +
>   	return chunk;
>   }
>
> @@ -238,4 +238,3 @@ void sctp_inq_set_th_handler(struct sctp_inq *q, work_func_t callback)
>   {
>   	INIT_WORK(&q->immediate, callback);
>   }
> -
> diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
> index adeaa0e..09ffcc9 100644
> --- a/net/sctp/ipv6.c
> +++ b/net/sctp/ipv6.c
> @@ -239,9 +239,8 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
>   		fl6.daddr = *rt0->addr;
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
> -			  __func__, skb, skb->len,
> -			  &fl6.saddr, &fl6.daddr);
> +	pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
> +		 skb->len, &fl6.saddr, &fl6.daddr);
>
>   	SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
>
> @@ -276,7 +275,7 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
>   	if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
>   		fl6->flowi6_oif = daddr->v6.sin6_scope_id;
>
> -	SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
> +	pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
>
>   	if (asoc)
>   		fl6->fl6_sport = htons(asoc->base.bind_addr.port);
> @@ -284,7 +283,8 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
>   	if (saddr) {
>   		fl6->saddr = saddr->v6.sin6_addr;
>   		fl6->fl6_sport = saddr->v6.sin6_port;
> -		SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
> +
> +		pr_debug("src=%pI6 - ", &fl6->saddr);
>   	}
>
>   	dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
> @@ -348,13 +348,16 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
>   out:
>   	if (!IS_ERR_OR_NULL(dst)) {
>   		struct rt6_info *rt;
> +
>   		rt = (struct rt6_info *)dst;
>   		t->dst = dst;
> -		SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
> -			&rt->rt6i_dst.addr, &fl6->saddr);
> +
> +		pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
> +			 &fl6->saddr);
>   	} else {
>   		t->dst = NULL;
> -		SCTP_DEBUG_PRINTK("NO ROUTE\n");
> +
> +		pr_debug("no route\n");
>   	}
>   }
>
> @@ -377,7 +380,7 @@ static void sctp_v6_get_saddr(struct sctp_sock *sk,
>   	struct flowi6 *fl6 = &fl->u.ip6;
>   	union sctp_addr *saddr = &t->saddr;
>
> -	SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
> +	pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
>
>   	if (t->dst) {
>   		saddr->v6.sin6_family = AF_INET6;
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> index bbef4a7..f07e533 100644
> --- a/net/sctp/output.c
> +++ b/net/sctp/output.c
> @@ -93,8 +93,7 @@ struct sctp_packet *sctp_packet_config(struct sctp_packet *packet,
>   {
>   	struct sctp_chunk *chunk = NULL;
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p vtag:0x%x\n", __func__,
> -			  packet, vtag);
> +	pr_debug("%s: packet:%p vtag:0x%x\n", __func__, packet, vtag);
>
>   	packet->vtag = vtag;
>
> @@ -119,8 +118,7 @@ struct sctp_packet *sctp_packet_init(struct sctp_packet *packet,
>   	struct sctp_association *asoc = transport->asoc;
>   	size_t overhead;
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p transport:%p\n", __func__,
> -			  packet, transport);
> +	pr_debug("%s: packet:%p transport:%p\n", __func__, packet, transport);
>
>   	packet->transport = transport;
>   	packet->source_port = sport;
> @@ -145,7 +143,7 @@ void sctp_packet_free(struct sctp_packet *packet)
>   {
>   	struct sctp_chunk *chunk, *tmp;
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p\n", __func__, packet);
> +	pr_debug("%s: packet:%p\n", __func__, packet);
>
>   	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {
>   		list_del_init(&chunk->list);
> @@ -167,8 +165,7 @@ sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *packet,
>   	sctp_xmit_t retval;
>   	int error = 0;
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __func__,
> -			  packet, chunk);
> +	pr_debug("%s: packet:%p chunk:%p\n", __func__, packet, chunk);
>
>   	switch ((retval = (sctp_packet_append_chunk(packet, chunk)))) {
>   	case SCTP_XMIT_PMTU_FULL:
> @@ -334,8 +331,7 @@ sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *packet,
>   {
>   	sctp_xmit_t retval = SCTP_XMIT_OK;
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __func__, packet,
> -			  chunk);
> +	pr_debug("%s: packet:%p chunk:%p\n", __func__, packet, chunk);
>
>   	/* Data chunks are special.  Before seeing what else we can
>   	 * bundle into this packet, check to see if we are allowed to
> @@ -402,7 +398,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>   	unsigned char *auth = NULL;	/* pointer to auth in skb data */
>   	__u32 cksum_buf_len = sizeof(struct sctphdr);
>
> -	SCTP_DEBUG_PRINTK("%s: packet:%p\n", __func__, packet);
> +	pr_debug("%s: packet:%p\n", __func__, packet);
>
>   	/* Do NOT generate a chunkless packet. */
>   	if (list_empty(&packet->chunk_list))
> @@ -472,7 +468,9 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>   	 *
>   	 * [This whole comment explains WORD_ROUND() below.]
>   	 */
> -	SCTP_DEBUG_PRINTK("***sctp_transmit_packet***\n");
> +
> +	pr_debug("***sctp_transmit_packet***\n");
> +
>   	list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {
>   		list_del_init(&chunk->list);
>   		if (sctp_chunk_is_data(chunk)) {
> @@ -505,16 +503,13 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>   		memcpy(skb_put(nskb, chunk->skb->len),
>   			       chunk->skb->data, chunk->skb->len);
>
> -		SCTP_DEBUG_PRINTK("%s %p[%s] %s 0x%x, %s %d, %s %d, %s %d\n",
> -				  "*** Chunk", chunk,
> -				  sctp_cname(SCTP_ST_CHUNK(
> -					  chunk->chunk_hdr->type)),
> -				  chunk->has_tsn ? "TSN" : "No TSN",
> -				  chunk->has_tsn ?
> -				  ntohl(chunk->subh.data_hdr->tsn) : 0,
> -				  "length", ntohs(chunk->chunk_hdr->length),
> -				  "chunk->skb->len", chunk->skb->len,
> -				  "rtt_in_progress", chunk->rtt_in_progress);
> +		pr_debug("*** Chunk:%p[%s] %s 0x%x, length:%d, chunk->skb->len:%d, "
> +			 "rtt_in_progress %d\n", chunk,
> +			 sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)),
> +			 chunk->has_tsn ? "TSN" : "No TSN",
> +			 chunk->has_tsn ? ntohl(chunk->subh.data_hdr->tsn) : 0,
> +			 ntohs(chunk->chunk_hdr->length), chunk->skb->len,
> +			 chunk->rtt_in_progress);
>
>   		/*
>   		 * If this is a control chunk, this is our last
> @@ -606,8 +601,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>   		}
>   	}
>
> -	SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb len %d\n",
> -			  nskb->len);
> +	pr_debug("***sctp_transmit_packet*** skb->len:%d\n", nskb->len);
>
>   	nskb->local_df = packet->ipfragok;
>   	(*tp->af_specific->sctp_xmit)(nskb, tp);
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index be35e2d..f3d92cf 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -299,10 +299,10 @@ int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk)
>   	struct net *net = sock_net(q->asoc->base.sk);
>   	int error = 0;
>
> -	SCTP_DEBUG_PRINTK("sctp_outq_tail(%p, %p[%s])\n",
> -			  q, chunk, chunk && chunk->chunk_hdr ?
> -			  sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
> -			  : "Illegal Chunk");
> +	pr_debug("%s: outq:%p, chunk:%p[%s]\n", __func__, q, chunk,
> +		 chunk && chunk->chunk_hdr ?
> +		 sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
> +		 "illegal chunk");
>
>   	/* If it is data, queue it up, otherwise, send it
>   	 * immediately.
> @@ -328,10 +328,10 @@ int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk)
>   			break;
>
>   		default:
> -			SCTP_DEBUG_PRINTK("outqueueing (%p, %p[%s])\n",
> -			  q, chunk, chunk && chunk->chunk_hdr ?
> -			  sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type))
> -			  : "Illegal Chunk");
> +			pr_debug("%s: outqueueing: outq:%p, chunk:%p[%s])\n",
> +				 __func__, q, chunk, chunk && chunk->chunk_hdr ?
> +				 sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
> +				 "illegal chunk");
>
>   			sctp_outq_tail_data(q, chunk);
>   			if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
> @@ -460,14 +460,10 @@ void sctp_retransmit_mark(struct sctp_outq *q,
>   		}
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: transport: %p, reason: %d, "
> -			  "cwnd: %d, ssthresh: %d, flight_size: %d, "
> -			  "pba: %d\n", __func__,
> -			  transport, reason,
> -			  transport->cwnd, transport->ssthresh,
> -			  transport->flight_size,
> -			  transport->partial_bytes_acked);
> -
> +	pr_debug("%s: transport:%p, reason:%d, cwnd:%d, ssthresh:%d, "
> +		 "flight_size:%d, pba:%d\n", __func__, transport, reason,
> +		 transport->cwnd, transport->ssthresh, transport->flight_size,
> +		 transport->partial_bytes_acked);
>   }
>
>   /* Mark all the eligible packets on a transport for retransmission and force
> @@ -1014,19 +1010,13 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
>   				sctp_transport_burst_limited(transport);
>   			}
>
> -			SCTP_DEBUG_PRINTK("sctp_outq_flush(%p, %p[%s]), ",
> -					  q, chunk,
> -					  chunk && chunk->chunk_hdr ?
> -					  sctp_cname(SCTP_ST_CHUNK(
> -						  chunk->chunk_hdr->type))
> -					  : "Illegal Chunk");
> -
> -			SCTP_DEBUG_PRINTK("TX TSN 0x%x skb->head "
> -					"%p skb->users %d.\n",
> -					ntohl(chunk->subh.data_hdr->tsn),
> -					chunk->skb ?chunk->skb->head : NULL,
> -					chunk->skb ?
> -					atomic_read(&chunk->skb->users) : -1);
> +			pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p "
> +				 "skb->users:%d\n",
> +				 __func__, q, chunk, chunk && chunk->chunk_hdr ?
> +				 sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
> +				 "illegal chunk", ntohl(chunk->subh.data_hdr->tsn),
> +				 chunk->skb ?chunk->skb->head : NULL, chunk->skb ?
> +				 atomic_read(&chunk->skb->users) : -1);
>
>   			/* Add the chunk to the packet.  */
>   			status = sctp_packet_transmit_chunk(packet, chunk, 0);
> @@ -1038,10 +1028,10 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
>   				/* We could not append this chunk, so put
>   				 * the chunk back on the output queue.
>   				 */
> -				SCTP_DEBUG_PRINTK("sctp_outq_flush: could "
> -					"not transmit TSN: 0x%x, status: %d\n",
> -					ntohl(chunk->subh.data_hdr->tsn),
> -					status);
> +				pr_debug("%s: could not transmit tsn:0x%x, status:%d\n",
> +					 __func__, ntohl(chunk->subh.data_hdr->tsn),
> +					 status);
> +
>   				sctp_outq_head_data(q, chunk);
>   				goto sctp_flush_out;
>   				break;
> @@ -1284,11 +1274,10 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
>
>   	sctp_generate_fwdtsn(q, sack_ctsn);
>
> -	SCTP_DEBUG_PRINTK("%s: sack Cumulative TSN Ack is 0x%x.\n",
> -			  __func__, sack_ctsn);
> -	SCTP_DEBUG_PRINTK("%s: Cumulative TSN Ack of association, "
> -			  "%p is 0x%x. Adv peer ack point: 0x%x\n",
> -			  __func__, asoc, ctsn, asoc->adv_peer_ack_point);
> +	pr_debug("%s: sack cumulative tsn ack:0x%x\n", __func__, sack_ctsn);
> +	pr_debug("%s: cumulative tsn ack of assoc:%p is 0x%x, "
> +		 "advertised peer ack point:0x%x\n", __func__, asoc, ctsn,
> +		 asoc->adv_peer_ack_point);
>
>   	/* See if all chunks are acked.
>   	 * Make sure the empty queue handler will get run later.
> @@ -1304,7 +1293,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
>   			goto finish;
>   	}
>
> -	SCTP_DEBUG_PRINTK("sack queue is empty.\n");
> +	pr_debug("%s: sack queue is empty.\n", __func__);
>   finish:
>   	return q->empty;
>   }
> @@ -1348,7 +1337,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>
>   	/* These state variables are for coherent debug output. --xguo */
>
> -#if SCTP_DEBUG
> +#ifdef CONFIG_SCTP_DBG_TSNS
>   	__u32 dbg_ack_tsn = 0;	/* An ACKed TSN range starts here... */
>   	__u32 dbg_last_ack_tsn = 0;  /* ...and finishes here.	     */
>   	__u32 dbg_kept_tsn = 0;	/* An un-ACKed range starts here...  */
> @@ -1359,7 +1348,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>   	 * -1: We need to initialize.
>   	 */
>   	int dbg_prt_state = -1;
> -#endif /* SCTP_DEBUG */
> +#endif /* CONFIG_SCTP_DBG_TSNS */
>
>   	sack_ctsn = ntohl(sack->cum_tsn_ack);
>
> @@ -1483,7 +1472,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>   				list_add_tail(lchunk, &tlist);
>   			}
>
> -#if SCTP_DEBUG
> +#ifdef CONFIG_SCTP_DBG_TSNS
>   			switch (dbg_prt_state) {
>   			case 0:	/* last TSN was ACKed */
>   				if (dbg_last_ack_tsn + 1 == tsn) {
> @@ -1497,42 +1486,39 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>   					/* Display the end of the
>   					 * current range.
>   					 */
> -					SCTP_DEBUG_PRINTK_CONT("-%08x",
> -							       dbg_last_ack_tsn);
> +					pr_cont("-%08x", dbg_last_ack_tsn);
>   				}
>
>   				/* Start a new range.  */
> -				SCTP_DEBUG_PRINTK_CONT(",%08x", tsn);
> +				pr_cont(",%08x", tsn);
>   				dbg_ack_tsn = tsn;
>   				break;
>
>   			case 1:	/* The last TSN was NOT ACKed. */
>   				if (dbg_last_kept_tsn != dbg_kept_tsn) {
>   					/* Display the end of current range. */
> -					SCTP_DEBUG_PRINTK_CONT("-%08x",
> -							       dbg_last_kept_tsn);
> +					pr_cont("-%08x", dbg_last_kept_tsn);
>   				}
>
> -				SCTP_DEBUG_PRINTK_CONT("\n");
> -
> +				pr_cont("\n");
>   				/* FALL THROUGH... */
>   			default:
>   				/* This is the first-ever TSN we examined.  */
>   				/* Start a new range of ACK-ed TSNs.  */
> -				SCTP_DEBUG_PRINTK("ACKed: %08x", tsn);
> +				pr_debug("ACKed: %08x", tsn);
> +
>   				dbg_prt_state = 0;
>   				dbg_ack_tsn = tsn;
>   			}
>
>   			dbg_last_ack_tsn = tsn;
> -#endif /* SCTP_DEBUG */
> +#endif /* CONFIG_SCTP_DBG_TSNS */
>
>   		} else {
>   			if (tchunk->tsn_gap_acked) {
> -				SCTP_DEBUG_PRINTK("%s: Receiver reneged on "
> -						  "data TSN: 0x%x\n",
> -						  __func__,
> -						  tsn);
> +				pr_debug("%s: receiver reneged on data TSN:0x%x\n",
> +					 __func__, tsn);
> +
>   				tchunk->tsn_gap_acked = 0;
>
>   				if (tchunk->transport)
> @@ -1552,7 +1538,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>
>   			list_add_tail(lchunk, &tlist);
>
> -#if SCTP_DEBUG
> +#ifdef CONFIG_SCTP_DBG_TSNS
>   			/* See the above comments on ACK-ed TSNs. */
>   			switch (dbg_prt_state) {
>   			case 1:
> @@ -1560,50 +1546,47 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>   					break;
>
>   				if (dbg_last_kept_tsn != dbg_kept_tsn)
> -					SCTP_DEBUG_PRINTK_CONT("-%08x",
> -							       dbg_last_kept_tsn);
> +					pr_cont("-%08x", dbg_last_kept_tsn);
>
> -				SCTP_DEBUG_PRINTK_CONT(",%08x", tsn);
> +				pr_cont(",%08x", tsn);
>   				dbg_kept_tsn = tsn;
>   				break;
>
>   			case 0:
>   				if (dbg_last_ack_tsn != dbg_ack_tsn)
> -					SCTP_DEBUG_PRINTK_CONT("-%08x",
> -							       dbg_last_ack_tsn);
> -				SCTP_DEBUG_PRINTK_CONT("\n");
> +					pr_cont("-%08x", dbg_last_ack_tsn);
>
> +				pr_cont("\n");
>   				/* FALL THROUGH... */
>   			default:
> -				SCTP_DEBUG_PRINTK("KEPT: %08x",tsn);
> +				pr_debug("KEPT: %08x", tsn);
> +
>   				dbg_prt_state = 1;
>   				dbg_kept_tsn = tsn;
>   			}
>
>   			dbg_last_kept_tsn = tsn;
> -#endif /* SCTP_DEBUG */
> +#endif /* CONFIG_SCTP_DBG_TSNS */
>   		}
>   	}
>
> -#if SCTP_DEBUG
> +#ifdef CONFIG_SCTP_DBG_TSNS
>   	/* Finish off the last range, displaying its ending TSN.  */
>   	switch (dbg_prt_state) {
>   	case 0:
> -		if (dbg_last_ack_tsn != dbg_ack_tsn) {
> -			SCTP_DEBUG_PRINTK_CONT("-%08x\n", dbg_last_ack_tsn);
> -		} else {
> -			SCTP_DEBUG_PRINTK_CONT("\n");
> -		}
> -	break;
> -
> +		if (dbg_last_ack_tsn != dbg_ack_tsn)
> +			pr_cont("-%08x\n", dbg_last_ack_tsn);
> +		else
> +			pr_cont("\n");
> +		break;
>   	case 1:
> -		if (dbg_last_kept_tsn != dbg_kept_tsn) {
> -			SCTP_DEBUG_PRINTK_CONT("-%08x\n", dbg_last_kept_tsn);
> -		} else {
> -			SCTP_DEBUG_PRINTK_CONT("\n");
> -		}
> +		if (dbg_last_kept_tsn != dbg_kept_tsn)
> +			pr_cont("-%08x\n", dbg_last_kept_tsn);
> +		else
> +			pr_cont("\n");
> +		break;
>   	}
> -#endif /* SCTP_DEBUG */
> +#endif /* CONFIG_SCTP_DBG_TSNS */
>   	if (transport) {
>   		if (bytes_acked) {
>   			struct sctp_association *asoc = transport->asoc;
> @@ -1676,9 +1659,9 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>   			    !list_empty(&tlist) &&
>   			    (sack_ctsn+2 == q->asoc->next_tsn) &&
>   			    q->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) {
> -				SCTP_DEBUG_PRINTK("%s: SACK received for zero "
> -						  "window probe: %u\n",
> -						  __func__, sack_ctsn);
> +				pr_debug("%s: sack received for zero window "
> +					 "probe:%u\n", __func__, sack_ctsn);
> +
>   				q->asoc->overall_error_count = 0;
>   				transport->error_count = 0;
>   			}
> @@ -1739,10 +1722,8 @@ static void sctp_mark_missing(struct sctp_outq *q,
>   						count_of_newacks, tsn)) {
>   				chunk->tsn_missing_report++;
>
> -				SCTP_DEBUG_PRINTK(
> -					"%s: TSN 0x%x missing counter: %d\n",
> -					__func__, tsn,
> -					chunk->tsn_missing_report);
> +				pr_debug("%s: tsn:0x%x missing counter:%d\n",
> +					 __func__, tsn, chunk->tsn_missing_report);
>   			}
>   		}
>   		/*
> @@ -1762,11 +1743,10 @@ static void sctp_mark_missing(struct sctp_outq *q,
>   		if (do_fast_retransmit)
>   			sctp_retransmit(q, transport, SCTP_RTXR_FAST_RTX);
>
> -		SCTP_DEBUG_PRINTK("%s: transport: %p, cwnd: %d, "
> -				  "ssthresh: %d, flight_size: %d, pba: %d\n",
> -				  __func__, transport, transport->cwnd,
> -				  transport->ssthresh, transport->flight_size,
> -				  transport->partial_bytes_acked);
> +		pr_debug("%s: transport:%p, cwnd:%d, ssthresh:%d, "
> +			 "flight_size:%d, pba:%d\n",  __func__, transport,
> +			 transport->cwnd, transport->ssthresh,
> +			 transport->flight_size, transport->partial_bytes_acked);
>   	}
>   }
>
> diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
> index 1de49c8..f193d4e 100644
> --- a/net/sctp/protocol.c
> +++ b/net/sctp/protocol.c
> @@ -451,8 +451,8 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
>   		fl4->fl4_sport = saddr->v4.sin_port;
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
> -			  __func__, &fl4->daddr, &fl4->saddr);
> +	pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
> +		 &fl4->saddr);
>
>   	rt = ip_route_output_key(sock_net(sk), fl4);
>   	if (!IS_ERR(rt))
> @@ -513,10 +513,10 @@ out_unlock:
>   out:
>   	t->dst = dst;
>   	if (dst)
> -		SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
> -				  &fl4->daddr, &fl4->saddr);
> +		pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
> +			 &fl4->daddr, &fl4->saddr);
>   	else
> -		SCTP_DEBUG_PRINTK("NO ROUTE\n");
> +		pr_debug("no route\n");
>   }
>
>   /* For v4, the source address is cached in the route entry(dst). So no need
> @@ -604,9 +604,9 @@ static void sctp_addr_wq_timeout_handler(unsigned long arg)
>   	spin_lock_bh(&net->sctp.addr_wq_lock);
>
>   	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
> -		SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
> -		    " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
> -		    addrw);
> +		pr_debug("%s: the first ent in wq:%p is addr:%pIg for cmd:%d at "
> +			 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
> +			 addrw->state, addrw);
>
>   #if IS_ENABLED(CONFIG_IPV6)
>   		/* Now we send an ASCONF for each association */
> @@ -623,8 +623,10 @@ static void sctp_addr_wq_timeout_handler(unsigned long arg)
>   			    addrw->state == SCTP_ADDR_NEW) {
>   				unsigned long timeo_val;
>
> -				SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
> -				    SCTP_ADDRESS_TICK_DELAY);
> +				pr_debug("%s: this is on DAD, trying %d sec "
> +					 "later\n", __func__,
> +					 SCTP_ADDRESS_TICK_DELAY);
> +
>   				timeo_val = jiffies;
>   				timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
>   				mod_timer(&net->sctp.addr_wq_timer, timeo_val);
> @@ -641,7 +643,7 @@ static void sctp_addr_wq_timeout_handler(unsigned long arg)
>   				continue;
>   			sctp_bh_lock_sock(sk);
>   			if (sctp_asconf_mgmt(sp, addrw) < 0)
> -				SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
> +				pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
>   			sctp_bh_unlock_sock(sk);
>   		}
>   #if IS_ENABLED(CONFIG_IPV6)
> @@ -707,9 +709,10 @@ void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cm
>   	addrw = sctp_addr_wq_lookup(net, addr);
>   	if (addrw) {
>   		if (addrw->state != cmd) {
> -			SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
> -			    " in wq %p\n", addrw->state, &addrw->a,
> -			    &net->sctp.addr_waitq);
> +			pr_debug("%s: offsets existing entry for %d, addr:%pIg "
> +				 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
> +				 &net->sctp.addr_waitq);
> +
>   			list_del(&addrw->list);
>   			kfree(addrw);
>   		}
> @@ -725,8 +728,9 @@ void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cm
>   	}
>   	addrw->state = cmd;
>   	list_add_tail(&addrw->list, &net->sctp.addr_waitq);
> -	SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
> -	    " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
> +
> +	pr_debug("%s: add new entry for cmd:%d, addr:%pIg in wq:%p\n",
> +		 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
>
>   	if (!timer_pending(&net->sctp.addr_wq_timer)) {
>   		timeo_val = jiffies;
> @@ -952,15 +956,14 @@ static inline int sctp_v4_xmit(struct sk_buff *skb,
>   {
>   	struct inet_sock *inet = inet_sk(skb->sk);
>
> -	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
> -			  __func__, skb, skb->len,
> -			  &transport->fl.u.ip4.saddr,
> -			  &transport->fl.u.ip4.daddr);
> +	pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
> +		 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
>
>   	inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
>   			 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
>
>   	SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
> +
>   	return ip_queue_xmit(skb, &transport->fl);
>   }
>
> @@ -1321,9 +1324,8 @@ static __init int sctp_init(void)
>   	int max_share;
>   	int order;
>
> -	/* SCTP_DEBUG sanity check. */
> -	if (!sctp_sanity_check())
> -		goto out;
> +	BUILD_BUG_ON(sizeof(struct sctp_ulpevent) >
> +		     sizeof(((struct sk_buff *) 0)->cb));
>
>   	/* Allocate bind_bucket and chunk caches. */
>   	status = -ENOBUFS;
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index dd71f1f..781a848 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -741,7 +741,8 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
>
>   	memset(gabs, 0, sizeof(gabs));
>   	ctsn = sctp_tsnmap_get_ctsn(map);
> -	SCTP_DEBUG_PRINTK("sackCTSNAck sent:  0x%x.\n", ctsn);
> +
> +	pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn);
>
>   	/* How much room is needed in the chunk? */
>   	num_gabs = sctp_tsnmap_num_gabs(map, gabs);
> @@ -1287,10 +1288,8 @@ struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
>
>   	if (!retval)
>   		goto nodata;
> -
> -	if (!sk) {
> -		SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
> -	}
> +	if (!sk)
> +		pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb);
>
>   	INIT_LIST_HEAD(&retval->list);
>   	retval->skb		= skb;
> @@ -2191,8 +2190,9 @@ static sctp_ierror_t sctp_verify_param(struct net *net,
>   		break;
>   fallthrough:
>   	default:
> -		SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
> -				ntohs(param.p->type), cid);
> +		pr_debug("%s: unrecognized param:%d for chunk:%d\n",
> +			 __func__, ntohs(param.p->type), cid);
> +
>   		retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
>   		break;
>   	}
> @@ -2516,7 +2516,7 @@ do_addr_param:
>   		break;
>
>   	case SCTP_PARAM_HOST_NAME_ADDRESS:
> -		SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
> +		pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__);
>   		break;
>
>   	case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
> @@ -2662,8 +2662,8 @@ fall_through:
>   		 * called prior to this routine.  Simply log the error
>   		 * here.
>   		 */
> -		SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
> -				  ntohs(param.p->type), asoc);
> +		pr_debug("%s: ignoring param:%d for association:%p.\n",
> +			 __func__, ntohs(param.p->type), asoc);
>   		break;
>   	}
>
> @@ -2805,7 +2805,10 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
>   			totallen += paramlen;
>   			totallen += addr_param_len;
>   			del_pickup = 1;
> -			SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
> +
> +			pr_debug("%s: picked same-scope del_pending addr, "
> +				 "totallen for all addresses is %d\n",
> +				 __func__, totallen);
>   		}
>   	}
>
> diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> index ff91f47..f79be42 100644
> --- a/net/sctp/sm_sideeffect.c
> +++ b/net/sctp/sm_sideeffect.c
> @@ -257,7 +257,7 @@ void sctp_generate_t3_rtx_event(unsigned long peer)
>
>   	sctp_bh_lock_sock(asoc->base.sk);
>   	if (sock_owned_by_user(asoc->base.sk)) {
> -		SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
> +		pr_debug("%s: sock is busy\n", __func__);
>
>   		/* Try again later.  */
>   		if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
> @@ -297,9 +297,8 @@ static void sctp_generate_timeout_event(struct sctp_association *asoc,
>
>   	sctp_bh_lock_sock(asoc->base.sk);
>   	if (sock_owned_by_user(asoc->base.sk)) {
> -		SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
> -				  __func__,
> -				  timeout_type);
> +		pr_debug("%s: sock is busy: timer %d\n", __func__,
> +			 timeout_type);
>
>   		/* Try again later.  */
>   		if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
> @@ -377,7 +376,7 @@ void sctp_generate_heartbeat_event(unsigned long data)
>
>   	sctp_bh_lock_sock(asoc->base.sk);
>   	if (sock_owned_by_user(asoc->base.sk)) {
> -		SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
> +		pr_debug("%s: sock is busy\n", __func__);
>
>   		/* Try again later.  */
>   		if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
> @@ -415,7 +414,7 @@ void sctp_generate_proto_unreach_event(unsigned long data)
>   	
>   	sctp_bh_lock_sock(asoc->base.sk);
>   	if (sock_owned_by_user(asoc->base.sk)) {
> -		SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
> +		pr_debug("%s: sock is busy\n", __func__);
>
>   		/* Try again later.  */
>   		if (!mod_timer(&transport->proto_unreach_timer,
> @@ -521,11 +520,10 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
>
>   	if (transport->state != SCTP_INACTIVE &&
>   	    (transport->error_count > transport->pathmaxrxt)) {
> -		SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
> -					 " transport IP: port:%d failed.\n",
> -					 asoc,
> -					 (&transport->ipaddr),
> -					 ntohs(transport->ipaddr.v4.sin_port));
> +		pr_debug("%s: association:%p transport addr:%pIg port:%d "
> +			 "failed.\n", __func__, asoc, &transport->ipaddr.sa,
> +			 ntohs(transport->ipaddr.v4.sin_port));
> +
>   		sctp_assoc_control_transport(asoc, transport,
>   					     SCTP_TRANSPORT_DOWN,
>   					     SCTP_FAILED_THRESHOLD);
> @@ -804,8 +802,7 @@ static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
>
>   	asoc->state = state;
>
> -	SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
> -			  asoc, sctp_state_tbl[state]);
> +	pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]);
>
>   	if (sctp_style(sk, TCP)) {
>   		/* Change the sk->sk_state of a TCP-style socket that has
> @@ -1017,15 +1014,11 @@ static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
>   			asoc->timeouts[timer] = asoc->max_init_timeo;
>   		}
>   		asoc->init_cycle++;
> -		SCTP_DEBUG_PRINTK(
> -			"T1 %s Timeout adjustment"
> -			" init_err_counter: %d"
> -			" cycle: %d"
> -			" timeout: %ld\n",
> -			name,
> -			asoc->init_err_counter,
> -			asoc->init_cycle,
> -			asoc->timeouts[timer]);
> +
> +		pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
> +			 " cycle:%d timeout:%ld\n", __func__, name,
> +			 asoc->init_err_counter, asoc->init_cycle,
> +			 asoc->timeouts[timer]);
>   	}
>
>   }
> @@ -1080,23 +1073,19 @@ static void sctp_cmd_send_asconf(struct sctp_association *asoc)
>    * main flow of sctp_do_sm() to keep attention focused on the real
>    * functionality there.
>    */
> -#define DEBUG_PRE \
> -	SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
> -			  "ep %p, %s, %s, asoc %p[%s], %s\n", \
> -			  ep, sctp_evttype_tbl[event_type], \
> -			  (*debug_fn)(subtype), asoc, \
> -			  sctp_state_tbl[state], state_fn->name)
> -
> -#define DEBUG_POST \
> -	SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
> -			  "asoc %p, status: %s\n", \
> -			  asoc, sctp_status_tbl[status])
> -
> -#define DEBUG_POST_SFX \
> -	SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
> -			  error, asoc, \
> -			  sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
> -			  sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
> +#define debug_pre_sfn() \
> +	pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
> +		 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype),   \
> +		 asoc, sctp_state_tbl[state], state_fn->name)
> +
> +#define debug_post_sfn() \
> +	pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
> +		 sctp_status_tbl[status])
> +
> +#define debug_post_sfx() \
> +	pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
> +		 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
> +		 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
>
>   /*
>    * This is the master state machine processing function.
> @@ -1116,7 +1105,6 @@ int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
>   	sctp_disposition_t status;
>   	int error = 0;
>   	typedef const char *(printfn_t)(sctp_subtype_t);
> -
>   	static printfn_t *table[] = {
>   		NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
>   	};
> @@ -1129,21 +1117,18 @@ int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
>
>   	sctp_init_cmd_seq(&commands);
>
> -	DEBUG_PRE;
> +	debug_pre_sfn();
>   	status = (*state_fn->fn)(net, ep, asoc, subtype, event_arg, &commands);
> -	DEBUG_POST;
> +	debug_post_sfn();
>
>   	error = sctp_side_effects(event_type, subtype, state,
>   				  ep, asoc, event_arg, status,
>   				  &commands, gfp);
> -	DEBUG_POST_SFX;
> +	debug_post_sfx();
>
>   	return error;
>   }
>
> -#undef DEBUG_PRE
> -#undef DEBUG_POST
> -
>   /*****************************************************************
>    * This the master state function side effect processing function.
>    *****************************************************************/
> @@ -1172,9 +1157,9 @@ static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
>
>   	switch (status) {
>   	case SCTP_DISPOSITION_DISCARD:
> -		SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
> -				  "event_type %d, event_id %d\n",
> -				  state, event_type, subtype.chunk);
> +		pr_debug("%s: ignored sctp protocol event - state:%d, "
> +			 "event_type:%d, event_id:%d\n", __func__, state,
> +			 event_type, subtype.chunk);
>   		break;
>
>   	case SCTP_DISPOSITION_NOMEM:
> @@ -1425,18 +1410,18 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
>
>   		case SCTP_CMD_CHUNK_ULP:
>   			/* Send a chunk to the sockets layer.  */
> -			SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
> -					  "chunk_up:", cmd->obj.chunk,
> -					  "ulpq:", &asoc->ulpq);
> +			pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
> +				 __func__, cmd->obj.chunk, &asoc->ulpq);
> +
>   			sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
>   					    GFP_ATOMIC);
>   			break;
>
>   		case SCTP_CMD_EVENT_ULP:
>   			/* Send a notification to the sockets layer.  */
> -			SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
> -					  "event_up:",cmd->obj.ulpevent,
> -					  "ulpq:",&asoc->ulpq);
> +			pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
> +				 __func__, cmd->obj.ulpevent, &asoc->ulpq);
> +
>   			sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
>   			break;
>
> @@ -1601,7 +1586,7 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
>   			break;
>
>   		case SCTP_CMD_REPORT_BAD_TAG:
> -			SCTP_DEBUG_PRINTK("vtag mismatch!\n");
> +			pr_debug("%s: vtag mismatch!\n", __func__);
>   			break;
>
>   		case SCTP_CMD_STRIKE:
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index b3d1868..f6b7109 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -1179,9 +1179,9 @@ sctp_disposition_t sctp_sf_backbeat_8_3(struct net *net,
>   	/* Check if the timestamp looks valid.  */
>   	if (time_after(hbinfo->sent_at, jiffies) ||
>   	    time_after(jiffies, hbinfo->sent_at + max_interval)) {
> -		SCTP_DEBUG_PRINTK("%s: HEARTBEAT ACK with invalid timestamp "
> -				  "received for transport: %p\n",
> -				   __func__, link);
> +		pr_debug("%s: HEARTBEAT ACK with invalid timestamp received "
> +			 "for transport:%p\n", __func__, link);
> +
>   		return SCTP_DISPOSITION_DISCARD;
>   	}
>
> @@ -2562,7 +2562,8 @@ static sctp_disposition_t sctp_stop_t1_and_abort(struct net *net,
>   					   const struct sctp_association *asoc,
>   					   struct sctp_transport *transport)
>   {
> -	SCTP_DEBUG_PRINTK("ABORT received (INIT).\n");
> +	pr_debug("%s: ABORT received (INIT)\n", __func__);
> +
>   	sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
>   			SCTP_STATE(SCTP_STATE_CLOSED));
>   	SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS);
> @@ -2572,6 +2573,7 @@ static sctp_disposition_t sctp_stop_t1_and_abort(struct net *net,
>   	/* CMD_INIT_FAILED will DELETE_TCB. */
>   	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
>   			SCTP_PERR(error));
> +
>   	return SCTP_DISPOSITION_ABORT;
>   }
>
> @@ -2637,8 +2639,9 @@ sctp_disposition_t sctp_sf_do_9_2_shutdown(struct net *net,
>   	ctsn = ntohl(sdh->cum_tsn_ack);
>
>   	if (TSN_lt(ctsn, asoc->ctsn_ack_point)) {
> -		SCTP_DEBUG_PRINTK("ctsn %x\n", ctsn);
> -		SCTP_DEBUG_PRINTK("ctsn_ack_point %x\n", asoc->ctsn_ack_point);
> +		pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn,
> +			 asoc->ctsn_ack_point);
> +
>   		return SCTP_DISPOSITION_DISCARD;
>   	}
>
> @@ -2721,8 +2724,9 @@ sctp_disposition_t sctp_sf_do_9_2_shut_ctsn(struct net *net,
>   	ctsn = ntohl(sdh->cum_tsn_ack);
>
>   	if (TSN_lt(ctsn, asoc->ctsn_ack_point)) {
> -		SCTP_DEBUG_PRINTK("ctsn %x\n", ctsn);
> -		SCTP_DEBUG_PRINTK("ctsn_ack_point %x\n", asoc->ctsn_ack_point);
> +		pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn,
> +			 asoc->ctsn_ack_point);
> +
>   		return SCTP_DISPOSITION_DISCARD;
>   	}
>
> @@ -3174,8 +3178,9 @@ sctp_disposition_t sctp_sf_eat_sack_6_2(struct net *net,
>   	 *     Point indicates an out-of-order SACK.
>   	 */
>   	if (TSN_lt(ctsn, asoc->ctsn_ack_point)) {
> -		SCTP_DEBUG_PRINTK("ctsn %x\n", ctsn);
> -		SCTP_DEBUG_PRINTK("ctsn_ack_point %x\n", asoc->ctsn_ack_point);
> +		pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn,
> +			 asoc->ctsn_ack_point);
> +
>   		return SCTP_DISPOSITION_DISCARD;
>   	}
>
> @@ -3859,7 +3864,7 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn(struct net *net,
>   	skb_pull(chunk->skb, len);
>
>   	tsn = ntohl(fwdtsn_hdr->new_cum_tsn);
> -	SCTP_DEBUG_PRINTK("%s: TSN 0x%x.\n", __func__, tsn);
> +	pr_debug("%s: TSN 0x%x\n", __func__, tsn);
>
>   	/* The TSN is too high--silently discard the chunk and count on it
>   	 * getting retransmitted later.
> @@ -3927,7 +3932,7 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn_fast(
>   	skb_pull(chunk->skb, len);
>
>   	tsn = ntohl(fwdtsn_hdr->new_cum_tsn);
> -	SCTP_DEBUG_PRINTK("%s: TSN 0x%x.\n", __func__, tsn);
> +	pr_debug("%s: TSN 0x%x\n", __func__, tsn);
>
>   	/* The TSN is too high--silently discard the chunk and count on it
>   	 * getting retransmitted later.
> @@ -4166,7 +4171,7 @@ sctp_disposition_t sctp_sf_unk_chunk(struct net *net,
>   	struct sctp_chunk *err_chunk;
>   	sctp_chunkhdr_t *hdr;
>
> -	SCTP_DEBUG_PRINTK("Processing the unknown chunk id %d.\n", type.chunk);
> +	pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk);
>
>   	if (!sctp_vtag_verify(unk_chunk, asoc))
>   		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
> @@ -4256,7 +4261,8 @@ sctp_disposition_t sctp_sf_discard_chunk(struct net *net,
>   		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
>   						  commands);
>
> -	SCTP_DEBUG_PRINTK("Chunk %d is discarded\n", type.chunk);
> +	pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk);
> +
>   	return SCTP_DISPOSITION_DISCARD;
>   }
>
> @@ -5184,7 +5190,9 @@ sctp_disposition_t sctp_sf_ignore_primitive(
>   	void *arg,
>   	sctp_cmd_seq_t *commands)
>   {
> -	SCTP_DEBUG_PRINTK("Primitive type %d is ignored.\n", type.primitive);
> +	pr_debug("%s: primitive type:%d is ignored\n", __func__,
> +		 type.primitive);
> +
>   	return SCTP_DISPOSITION_DISCARD;
>   }
>
> @@ -5379,7 +5387,9 @@ sctp_disposition_t sctp_sf_ignore_other(struct net *net,
>   					void *arg,
>   					sctp_cmd_seq_t *commands)
>   {
> -	SCTP_DEBUG_PRINTK("The event other type %d is ignored\n", type.other);
> +	pr_debug("%s: the event other type:%d is ignored\n",
> +		 __func__, type.other);
> +
>   	return SCTP_DISPOSITION_DISCARD;
>   }
>
> @@ -5527,7 +5537,8 @@ sctp_disposition_t sctp_sf_t1_init_timer_expire(struct net *net,
>   	struct sctp_bind_addr *bp;
>   	int attempts = asoc->init_err_counter + 1;
>
> -	SCTP_DEBUG_PRINTK("Timer T1 expired (INIT).\n");
> +	pr_debug("%s: timer T1 expired (INIT)\n", __func__);
> +
>   	SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS);
>
>   	if (attempts <= asoc->max_init_attempts) {
> @@ -5546,9 +5557,10 @@ sctp_disposition_t sctp_sf_t1_init_timer_expire(struct net *net,
>
>   		sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
>   	} else {
> -		SCTP_DEBUG_PRINTK("Giving up on INIT, attempts: %d"
> -				  " max_init_attempts: %d\n",
> -				  attempts, asoc->max_init_attempts);
> +		pr_debug("%s: giving up on INIT, attempts:%d "
> +			 "max_init_attempts:%d\n", __func__, attempts,
> +			 asoc->max_init_attempts);
> +
>   		sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
>   				SCTP_ERROR(ETIMEDOUT));
>   		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
> @@ -5588,7 +5600,8 @@ sctp_disposition_t sctp_sf_t1_cookie_timer_expire(struct net *net,
>   	struct sctp_chunk *repl = NULL;
>   	int attempts = asoc->init_err_counter + 1;
>
> -	SCTP_DEBUG_PRINTK("Timer T1 expired (COOKIE-ECHO).\n");
> +	pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__);
> +
>   	SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS);
>
>   	if (attempts <= asoc->max_init_attempts) {
> @@ -5636,7 +5649,8 @@ sctp_disposition_t sctp_sf_t2_timer_expire(struct net *net,
>   {
>   	struct sctp_chunk *reply = NULL;
>
> -	SCTP_DEBUG_PRINTK("Timer T2 expired.\n");
> +	pr_debug("%s: timer T2 expired\n", __func__);
> +
>   	SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS);
>
>   	((struct sctp_association *)asoc)->shutdown_retries++;
> @@ -5777,7 +5791,8 @@ sctp_disposition_t sctp_sf_t5_timer_expire(struct net *net,
>   {
>   	struct sctp_chunk *reply = NULL;
>
> -	SCTP_DEBUG_PRINTK("Timer T5 expired.\n");
> +	pr_debug("%s: timer T5 expired\n", __func__);
> +
>   	SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS);
>
>   	reply = sctp_make_abort(asoc, NULL, 0);
> @@ -5892,7 +5907,8 @@ sctp_disposition_t sctp_sf_timer_ignore(struct net *net,
>   					void *arg,
>   					sctp_cmd_seq_t *commands)
>   {
> -	SCTP_DEBUG_PRINTK("Timer %d ignored.\n", type.chunk);
> +	pr_debug("%s: timer %d ignored\n", __func__, type.chunk);
> +
>   	return SCTP_DISPOSITION_CONSUME;
>   }
>
> @@ -6102,7 +6118,7 @@ static int sctp_eat_data(const struct sctp_association *asoc,
>   	skb_pull(chunk->skb, sizeof(sctp_datahdr_t));
>
>   	tsn = ntohl(data_hdr->tsn);
> -	SCTP_DEBUG_PRINTK("eat_data: TSN 0x%x.\n", tsn);
> +	pr_debug("%s: TSN 0x%x\n", __func__, tsn);
>
>   	/* ASSERT:  Now skb->data is really the user data.  */
>
> @@ -6179,12 +6195,12 @@ static int sctp_eat_data(const struct sctp_association *asoc,
>   		 */
>   		if (sctp_tsnmap_has_gap(map) &&
>   		    (sctp_tsnmap_get_ctsn(map) + 1) == tsn) {
> -			SCTP_DEBUG_PRINTK("Reneging for tsn:%u\n", tsn);
> +			pr_debug("%s: reneging for tsn:%u\n", __func__, tsn);
>   			deliver = SCTP_CMD_RENEGE;
>   		} else {
> -			SCTP_DEBUG_PRINTK("Discard tsn: %u len: %Zd, "
> -					  "rwnd: %d\n", tsn, datalen,
> -					  asoc->rwnd);
> +			pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n",
> +				 __func__, tsn, datalen, asoc->rwnd);
> +
>   			return SCTP_IERROR_IGNORE_TSN;
>   		}
>   	}
> @@ -6199,7 +6215,8 @@ static int sctp_eat_data(const struct sctp_association *asoc,
>   	if (*sk->sk_prot_creator->memory_pressure) {
>   		if (sctp_tsnmap_has_gap(map) &&
>   	           (sctp_tsnmap_get_ctsn(map) + 1) == tsn) {
> -			SCTP_DEBUG_PRINTK("Under Pressure! Reneging for tsn:%u\n", tsn);
> +			pr_debug("%s: under pressure, reneging for tsn:%u\n",
> +				 __func__, tsn);
>   			deliver = SCTP_CMD_RENEGE;
>   		 }
>   	}
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 66fcdcf..9b1c74a 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -281,8 +281,8 @@ static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
>
>   	sctp_lock_sock(sk);
>
> -	SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
> -			  sk, addr, addr_len);
> +	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
> +		 addr, addr_len);
>
>   	/* Disallow binding twice. */
>   	if (!sctp_sk(sk)->ep->base.bind_addr.port)
> @@ -342,19 +342,15 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
>   	/* Common sockaddr verification. */
>   	af = sctp_sockaddr_af(sp, addr, len);
>   	if (!af) {
> -		SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
> -				  sk, addr, len);
> +		pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
> +			 __func__, sk, addr, len);
>   		return -EINVAL;
>   	}
>
>   	snum = ntohs(addr->v4.sin_port);
>
> -	SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
> -				 ", port: %d, new port: %d, len: %d)\n",
> -				 sk,
> -				 addr,
> -				 bp->port, snum,
> -				 len);
> +	pr_debug("%s: sk:%p, new addr:%pIg, port:%d, new port:%d, len:%d\n",
> +		 __func__, sk, &addr->sa, bp->port, snum, len);
>
>   	/* PF specific bind() address verification. */
>   	if (!sp->pf->bind_verify(sp, addr))
> @@ -368,9 +364,8 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
>   		if (!snum)
>   			snum = bp->port;
>   		else if (snum != bp->port) {
> -			SCTP_DEBUG_PRINTK("sctp_do_bind:"
> -				  " New port %d does not match existing port "
> -				  "%d.\n", snum, bp->port);
> +			pr_debug("%s: new port %d doesn't match existing port "
> +				 "%d\n", __func__, snum, bp->port);
>   			return -EINVAL;
>   		}
>   	}
> @@ -468,8 +463,8 @@ static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
>   	struct sockaddr *sa_addr;
>   	struct sctp_af *af;
>
> -	SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
> -			  sk, addrs, addrcnt);
> +	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
> +		 addrs, addrcnt);
>
>   	addr_buf = addrs;
>   	for (cnt = 0; cnt < addrcnt; cnt++) {
> @@ -535,11 +530,10 @@ static int sctp_send_asconf_add_ip(struct sock		*sk,
>   	sp = sctp_sk(sk);
>   	ep = sp->ep;
>
> -	SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
> -			  __func__, sk, addrs, addrcnt);
> +	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
> +		 __func__, sk, addrs, addrcnt);
>
>   	list_for_each_entry(asoc, &ep->asocs, asocs) {
> -
>   		if (!asoc->peer.asconf_capable)
>   			continue;
>
> @@ -646,8 +640,8 @@ static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
>   	union sctp_addr *sa_addr;
>   	struct sctp_af *af;
>
> -	SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
> -			  sk, addrs, addrcnt);
> +	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
> +		 __func__, sk, addrs, addrcnt);
>
>   	addr_buf = addrs;
>   	for (cnt = 0; cnt < addrcnt; cnt++) {
> @@ -740,8 +734,8 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
>   	sp = sctp_sk(sk);
>   	ep = sp->ep;
>
> -	SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
> -			  __func__, sk, addrs, addrcnt);
> +	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
> +		 __func__, sk, addrs, addrcnt);
>
>   	list_for_each_entry(asoc, &ep->asocs, asocs) {
>
> @@ -808,9 +802,11 @@ static int sctp_send_asconf_del_ip(struct sock		*sk,
>   				sin6 = (struct sockaddr_in6 *)addrs;
>   				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
>   			}
> -			SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
> -			    " at %p\n", asoc, asoc->asconf_addr_del_pending,
> -			    asoc->asconf_addr_del_pending);
> +
> +			pr_debug("%s: keep the last address asoc:%p %pIg at %p\n",
> +				 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
> +				 asoc->asconf_addr_del_pending);
> +
>   			asoc->src_out_of_asoc_ok = 1;
>   			stored = 1;
>   			goto skip_mkasconf;
> @@ -972,8 +968,8 @@ static int sctp_setsockopt_bindx(struct sock* sk,
>   	void *addr_buf;
>   	struct sctp_af *af;
>
> -	SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
> -			  " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
> +	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
> +		 __func__, sk, addrs, addrs_size, op);
>
>   	if (unlikely(addrs_size <= 0))
>   		return -EINVAL;
> @@ -1231,10 +1227,9 @@ static int __sctp_connect(struct sock* sk,
>   	asoc = NULL;
>
>   out_free:
> +	pr_debug("%s: exiting and free asoc:%p kaddrs:%p err:%d\n",
> +		 __func__, asoc, kaddrs, err);
>
> -	SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
> -			  " kaddrs: %p err: %d\n",
> -			  asoc, kaddrs, err);
>   	if (asoc) {
>   		/* sctp_primitive_ASSOCIATE may have added this association
>   		 * To the hash table, try to unhash it, just in case, its a noop
> @@ -1316,8 +1311,8 @@ static int __sctp_setsockopt_connectx(struct sock* sk,
>   	int err = 0;
>   	struct sockaddr *kaddrs;
>
> -	SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
> -			  __func__, sk, addrs, addrs_size);
> +	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
> +		 __func__, sk, addrs, addrs_size);
>
>   	if (unlikely(addrs_size <= 0))
>   		return -EINVAL;
> @@ -1468,7 +1463,7 @@ static void sctp_close(struct sock *sk, long timeout)
>   	struct list_head *pos, *temp;
>   	unsigned int data_was_unread;
>
> -	SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
> +	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
>
>   	sctp_lock_sock(sk);
>   	sk->sk_shutdown = SHUTDOWN_MASK;
> @@ -1594,14 +1589,12 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   	struct sctp_datamsg *datamsg;
>   	int msg_flags = msg->msg_flags;
>
> -	SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
> -			  sk, msg, msg_len);
> -
>   	err = 0;
>   	sp = sctp_sk(sk);
>   	ep = sp->ep;
>
> -	SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
> +	pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
> +		 msg, msg_len, ep);
>
>   	/* We cannot send a message over a TCP-style listening socket. */
>   	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
> @@ -1611,9 +1604,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>
>   	/* Parse out the SCTP CMSGs.  */
>   	err = sctp_msghdr_parse(msg, &cmsgs);
> -
>   	if (err) {
> -		SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
> +		pr_debug("msghdr parse err = %x\n", err);
>   		goto out_nounlock;
>   	}
>
> @@ -1645,8 +1637,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   		associd = sinfo->sinfo_assoc_id;
>   	}
>
> -	SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
> -			  msg_len, sinfo_flags);
> +	pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
> +		 msg_len, sinfo_flags);
>
>   	/* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
>   	if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
> @@ -1675,7 +1667,7 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>
>   	transport = NULL;
>
> -	SCTP_DEBUG_PRINTK("About to look up association.\n");
> +	pr_debug("%s: about to look up association.\n", __func__);
>
>   	sctp_lock_sock(sk);
>
> @@ -1705,7 +1697,7 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   	}
>
>   	if (asoc) {
> -		SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
> +		pr_debug("%s: just looked up association:%p.\n", __func__, asoc);
>
>   		/* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
>   		 * socket that has an association in CLOSED state. This can
> @@ -1718,8 +1710,9 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   		}
>
>   		if (sinfo_flags & SCTP_EOF) {
> -			SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
> -					  asoc);
> +			pr_debug("%s: shutting down association:%p\n",
> +				 __func__, asoc);
> +
>   			sctp_primitive_SHUTDOWN(net, asoc, NULL);
>   			err = 0;
>   			goto out_unlock;
> @@ -1732,7 +1725,9 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   				goto out_unlock;
>   			}
>
> -			SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
> +			pr_debug("%s: aborting association:%p\n",
> +				 __func__, asoc);
> +
>   			sctp_primitive_ABORT(net, asoc, chunk);
>   			err = 0;
>   			goto out_unlock;
> @@ -1741,7 +1736,7 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>
>   	/* Do we need to create the association?  */
>   	if (!asoc) {
> -		SCTP_DEBUG_PRINTK("There is no association yet.\n");
> +		pr_debug("%s: there is no association yet\n", __func__);
>
>   		if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
>   			err = -EINVAL;
> @@ -1840,7 +1835,7 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   	}
>
>   	/* ASSERT: we have a valid association at this point.  */
> -	SCTP_DEBUG_PRINTK("We have a valid association.\n");
> +	pr_debug("%s: we have a valid association\n", __func__);
>
>   	if (!sinfo) {
>   		/* If the user didn't specify SNDRCVINFO, make up one with
> @@ -1909,7 +1904,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
>   		if (err < 0)
>   			goto out_free;
> -		SCTP_DEBUG_PRINTK("We associated primitively.\n");
> +
> +		pr_debug("%s: we associated primitively\n", __func__);
>   	}
>
>   	/* Break the message into multiple chunks of maximum size. */
> @@ -1936,17 +1932,15 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   	 */
>   	err = sctp_primitive_SEND(net, asoc, datamsg);
>   	/* Did the lower layer accept the chunk? */
> -	if (err)
> +	if (err) {
>   		sctp_datamsg_free(datamsg);
> -	else
> -		sctp_datamsg_put(datamsg);
> +		goto out_free;
> +	}
>
> -	SCTP_DEBUG_PRINTK("We sent primitively.\n");
> +	pr_debug("%s: we sent primitively\n", __func__);
>
> -	if (err)
> -		goto out_free;
> -	else
> -		err = msg_len;
> +	sctp_datamsg_put(datamsg);
> +	err = msg_len;

Doesn't strictly belong in this patch although I see how this makes for 
better code.

>
>   	/* If we are already past ASSOCIATE, the lower
>   	 * layers are responsible for association cleanup.
> @@ -2041,10 +2035,9 @@ static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
>   	int err = 0;
>   	int skb_len;
>
> -	SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
> -			  "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
> -			  "len", len, "knoblauch", noblock,
> -			  "flags", flags, "addr_len", addr_len);
> +	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
> +		 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
> +		 addr_len);
>
>   	sctp_lock_sock(sk);
>
> @@ -3086,7 +3079,7 @@ static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optva
>
>   	err = sctp_send_asconf(asoc, chunk);
>
> -	SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
> +	pr_debug("%s: we set peer primary addr primitively\n", __func__);
>
>   	return err;
>   }
> @@ -3561,8 +3554,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
>   {
>   	int retval = 0;
>
> -	SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
> -			  sk, optname);
> +	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
>
>   	/* I can hardly begin to describe how wrong this is.  This is
>   	 * so broken as to be worse than useless.  The API draft
> @@ -3724,8 +3716,8 @@ static int sctp_connect(struct sock *sk, struct sockaddr *addr,
>
>   	sctp_lock_sock(sk);
>
> -	SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
> -			  __func__, sk, addr, addr_len);
> +	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
> +		 addr, addr_len);
>
>   	/* Validate addr_len before calling common connect/connectx routine. */
>   	af = sctp_get_af_specific(addr->sa_family);
> @@ -3855,7 +3847,7 @@ static int sctp_init_sock(struct sock *sk)
>   	struct net *net = sock_net(sk);
>   	struct sctp_sock *sp;
>
> -	SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
> +	pr_debug("%s: sk:%p\n", __func__, sk);
>
>   	sp = sctp_sk(sk);
>
> @@ -3990,7 +3982,7 @@ static void sctp_destroy_sock(struct sock *sk)
>   {
>   	struct sctp_sock *sp;
>
> -	SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
> +	pr_debug("%s: sk:%p\n", __func__, sk);
>
>   	/* Release our hold on the endpoint. */
>   	sp = sctp_sk(sk);
> @@ -4123,9 +4115,9 @@ static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
>   		goto out;
>   	}
>
> -	SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
> -			  len, status.sstat_state, status.sstat_rwnd,
> -			  status.sstat_assoc_id);
> +	pr_debug("%s: len:%d state:%d rwnd:%d assoc_id:%d\n",
> +		 __func__, len, status.sstat_state, status.sstat_rwnd,
> +		 status.sstat_assoc_id);
>
>   	if (copy_to_user(optval, &status, len)) {
>   		retval = -EFAULT;
> @@ -4333,8 +4325,8 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
>   		return PTR_ERR(newfile);
>   	}
>
> -	SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
> -			  __func__, sk, newsock->sk, retval);
> +	pr_debug("%s: sk:%p newsk:%p sd:%d\n", __func__, sk, newsock->sk,
> +		 retval);
>
>   	/* Return the fd mapped to the new socket.  */
>   	if (put_user(len, optlen)) {
> @@ -4467,7 +4459,7 @@ static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
>   		trans = sctp_addr_id2transport(sk, &params.spp_address,
>   					       params.spp_assoc_id);
>   		if (!trans) {
> -			SCTP_DEBUG_PRINTK("Failed no transport\n");
> +			pr_debug("%s: failed no transport\n", __func__);
>   			return -EINVAL;
>   		}
>   	}
> @@ -4478,7 +4470,7 @@ static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
>   	 */
>   	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
>   	if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
> -		SCTP_DEBUG_PRINTK("Failed no association\n");
> +		pr_debug("%s: failed no association\n", __func__);
>   		return -EINVAL;
>   	}
>
> @@ -5698,8 +5690,7 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
>   	if (put_user(len, optlen))
>   		return -EFAULT;
>
> -	SCTP_DEBUG_PRINTK("sctp_getsockopt_assoc_stat(%d): %d\n",
> -			  len, sas.sas_assoc_id);
> +	pr_debug("%s: len:%d assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
>
>   	if (copy_to_user(optval, &sas, len))
>   		return -EFAULT;
> @@ -5713,8 +5704,7 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
>   	int retval = 0;
>   	int len;
>
> -	SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
> -			  sk, optname);
> +	pr_debug("%s: sk:%p optname:%d\n", __func__, sk, optname);
>
>   	/* I can hardly begin to describe how wrong this is.  This is
>   	 * so broken as to be worse than useless.  The API draft
> @@ -5894,7 +5884,8 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
>
>   	snum = ntohs(addr->v4.sin_port);
>
> -	SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
> +	pr_debug("%s: begins, snum:%d\n", __func__, snum);
> +
>   	sctp_local_bh_disable();
>
>   	if (snum == 0) {
> @@ -5960,7 +5951,8 @@ pp_found:
>   		int reuse = sk->sk_reuse;
>   		struct sock *sk2;
>
> -		SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
> +		pr_debug("%s: found a possible match\n", __func__);
> +
>   		if (pp->fastreuse && sk->sk_reuse &&
>   			sk->sk_state != SCTP_SS_LISTENING)
>   			goto success;
> @@ -5990,7 +5982,8 @@ pp_found:
>   				goto fail_unlock;
>   			}
>   		}
> -		SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
> +
> +		pr_debug("%s: found a match\n", __func__);
>   	}
>   pp_not_found:
>   	/* If there was a hash table miss, create a new port.  */
> @@ -6479,8 +6472,8 @@ static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
>
>   	timeo = sock_rcvtimeo(sk, noblock);
>
> -	SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
> -			  timeo, MAX_SCHEDULE_TIMEOUT);
> +	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
> +		 MAX_SCHEDULE_TIMEOUT);
>
>   	do {
>   		/* Again only user level code calls this function,
> @@ -6611,8 +6604,8 @@ static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
>   	long current_timeo = *timeo_p;
>   	DEFINE_WAIT(wait);
>
> -	SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
> -			  asoc, (long)(*timeo_p), msg_len);
> +	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
> +		 *timeo_p, msg_len);
>
>   	/* Increment the association's refcnt.  */
>   	sctp_association_hold(asoc);
> @@ -6718,8 +6711,7 @@ static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
>   	long current_timeo = *timeo_p;
>   	DEFINE_WAIT(wait);
>
> -	SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
> -			  (long)(*timeo_p));
> +	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
>
>   	/* Increment the association's refcnt.  */
>   	sctp_association_hold(asoc);
> diff --git a/net/sctp/transport.c b/net/sctp/transport.c
> index 5d3c71b..0c564ac 100644
> --- a/net/sctp/transport.c
> +++ b/net/sctp/transport.c
> @@ -176,7 +176,10 @@ static void sctp_transport_destroy_rcu(struct rcu_head *head)
>    */
>   static void sctp_transport_destroy(struct sctp_transport *transport)
>   {
> -	SCTP_ASSERT(transport->dead, "Transport is not dead", return);
> +	if (unlikely(!transport->dead)) {
> +		WARN(1, "Attempt to destroy undead transport %p!\n", transport);
> +		return;
> +	}
>
>   	call_rcu(&transport->rcu, sctp_transport_destroy_rcu);
>
> @@ -317,11 +320,13 @@ void sctp_transport_put(struct sctp_transport *transport)
>   /* Update transport's RTO based on the newly calculated RTT. */
>   void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
>   {
> -	/* Check for valid transport.  */
> -	SCTP_ASSERT(tp, "NULL transport", return);
> +	BUG_ON(tp == NULL);
>
> -	/* We should not be doing any RTO updates unless rto_pending is set.  */
> -	SCTP_ASSERT(tp->rto_pending, "rto_pending not set", return);
> +	if (unlikely(!tp->rto_pending)) {
> +		/* We should not be doing any RTO updates unless rto_pending is set.  */
> +		WARN(1, "rto_pending not set on transport %p!\n", tp);
> +		return;
> +	}
>
>   	if (tp->rttvar || tp->srtt) {
>   		struct net *net = sock_net(tp->asoc->base.sk);
> @@ -377,9 +382,8 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
>   	 */
>   	tp->rto_pending = 0;
>
> -	SCTP_DEBUG_PRINTK("%s: transport: %p, rtt: %d, srtt: %d "
> -			  "rttvar: %d, rto: %ld\n", __func__,
> -			  tp, rtt, tp->srtt, tp->rttvar, tp->rto);
> +	pr_debug("%s: transport:%p, rtt:%d, srtt:%d rttvar:%d, rto:%ld\n",
> +		 __func__, tp, rtt, tp->srtt, tp->rttvar, tp->rto);
>   }
>
>   /* This routine updates the transport's cwnd and partial_bytes_acked
> @@ -433,12 +437,11 @@ void sctp_transport_raise_cwnd(struct sctp_transport *transport,
>   			cwnd += pmtu;
>   		else
>   			cwnd += bytes_acked;
> -		SCTP_DEBUG_PRINTK("%s: SLOW START: transport: %p, "
> -				  "bytes_acked: %d, cwnd: %d, ssthresh: %d, "
> -				  "flight_size: %d, pba: %d\n",
> -				  __func__,
> -				  transport, bytes_acked, cwnd,
> -				  ssthresh, flight_size, pba);
> +
> +		pr_debug("%s: slow start: transport:%p, bytes_acked:%d, "
> +			 "cwnd:%d, ssthresh:%d, flight_size:%d, pba:%d\n",
> +			 __func__, transport, bytes_acked, cwnd, ssthresh,
> +			 flight_size, pba);
>   	} else {
>   		/* RFC 2960 7.2.2 Whenever cwnd is greater than ssthresh,
>   		 * upon each SACK arrival that advances the Cumulative TSN Ack
> @@ -459,12 +462,12 @@ void sctp_transport_raise_cwnd(struct sctp_transport *transport,
>   			cwnd += pmtu;
>   			pba = ((cwnd < pba) ? (pba - cwnd) : 0);
>   		}
> -		SCTP_DEBUG_PRINTK("%s: CONGESTION AVOIDANCE: "
> -				  "transport: %p, bytes_acked: %d, cwnd: %d, "
> -				  "ssthresh: %d, flight_size: %d, pba: %d\n",
> -				  __func__,
> -				  transport, bytes_acked, cwnd,
> -				  ssthresh, flight_size, pba);
> +
> +		pr_debug("%s: congestion avoidance: transport:%p, "
> +			 "bytes_acked:%d, cwnd:%d, ssthresh:%d, "
> +			 "flight_size:%d, pba:%d\n", __func__,
> +			 transport, bytes_acked, cwnd, ssthresh,
> +			 flight_size, pba);
>   	}
>
>   	transport->cwnd = cwnd;
> @@ -558,10 +561,10 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
>   	}
>
>   	transport->partial_bytes_acked = 0;
> -	SCTP_DEBUG_PRINTK("%s: transport: %p reason: %d cwnd: "
> -			  "%d ssthresh: %d\n", __func__,
> -			  transport, reason,
> -			  transport->cwnd, transport->ssthresh);
> +
> +	pr_debug("%s: transport:%p reason:%d cwnd:%d ssthresh:%d\n",
> +		 __func__, transport, reason, transport->cwnd,
> +		 transport->ssthresh);
>   }
>
>   /* Apply Max.Burst limit to the congestion window:
>

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