[DCCP] CCID2: Add Kconfig option for CCID2 debug

Allow the user to choose whether or not to enable CCID2 debugging via
Kconfig.
Signed-off-by: NAndrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/dccp/ccids/Kconfig

@@ -30,6 +30,14 @@ config IP_DCCP_CCID2
 
 	  If in doubt, say M.
 
+config IP_DCCP_CCID2_DEBUG
+	  bool "CCID2 debug"
+	  depends on IP_DCCP_CCID2
+	  ---help---
+	    Enable CCID2 debug messages.
+
+	    If in doubt, say N.
+
 config IP_DCCP_CCID3
 	tristate "CCID3 (TCP-Friendly) (EXPERIMENTAL)"
 	depends on IP_DCCP

net/dccp/ccids/ccid2.c

@@ -35,8 +35,7 @@
 
 static int ccid2_debug;
 
-#undef CCID2_DEBUG
-#ifdef CCID2_DEBUG
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
 #define ccid2_pr_debug(format, a...) \
         do { if (ccid2_debug) \
                 printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
@@ -47,7 +46,7 @@ static int ccid2_debug;
 
 static const int ccid2_seq_len = 128;
 
-#ifdef CCID2_DEBUG
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
 static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
 {
 	int len = 0;
@@ -295,7 +294,7 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
 	if (!timer_pending(&hctx->ccid2hctx_rtotimer))
 		ccid2_start_rto_timer(sk);
 
-#ifdef CCID2_DEBUG
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
 	ccid2_pr_debug("pipe=%d\n", hctx->ccid2hctx_pipe);
 	ccid2_pr_debug("Sent: seq=%llu\n", seq);
 	do {