[PATCH v4 6/6] latencystats: fix for pedantic warnings

[Stephen Hemminger <stephen@networkplumber.org>]

ISO C does not allow casting function pointer to void *.
Resolve by enforcing the reserved argument.
The user_cb argument for rte_latencystats_init() was not
implemented, and had to be NULL anyway.

The log type is local to this function and RTE_LOG_REGISTER_DEFAULT
alread has a semicolon. So adding one here causes a warning
if compiler is set to pedantic.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/latencystats/rte_latencystats.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/latencystats/rte_latencystats.c b/lib/latencystats/rte_latencystats.c
index 5db896ac7b..f60c893199 100644
--- a/lib/latencystats/rte_latencystats.c
+++ b/lib/latencystats/rte_latencystats.c
@@ -29,7 +29,7 @@
 
 static double cycles_per_ns;
 
-RTE_LOG_REGISTER_DEFAULT(latencystat_logtype, INFO);
+static RTE_LOG_REGISTER_DEFAULT(latencystat_logtype, INFO)
 #define RTE_LOGTYPE_LATENCY_STATS latencystat_logtype
 #define LATENCY_STATS_LOG(level, ...) \
 	RTE_LOG_LINE(level, LATENCY_STATS, "" __VA_ARGS__)
@@ -229,6 +229,10 @@ rte_latencystats_init(uint64_t app_samp_intvl,
 	if (rte_memzone_lookup(MZ_RTE_LATENCY_STATS))
 		return -EEXIST;
 
+	/** Reserved for possible future use */
+	if (user_cb != NULL)
+		return -ENOTSUP;
+
 	/** Allocate stats in shared memory fo multi process support */
 	mz = rte_memzone_reserve(MZ_RTE_LATENCY_STATS, sizeof(*glob_stats),
 					rte_socket_id(), flags);
@@ -281,7 +285,7 @@ rte_latencystats_init(uint64_t app_samp_intvl,
 		for (qid = 0; qid < dev_info.nb_rx_queues; qid++) {
 			cbs = &rx_cbs[pid][qid];
 			cbs->cb = rte_eth_add_first_rx_callback(pid, qid,
-					add_time_stamps, user_cb);
+					add_time_stamps, NULL);
 			if (!cbs->cb)
 				LATENCY_STATS_LOG(NOTICE,
 					"Failed to register Rx callback for pid=%u, qid=%u",
@@ -290,7 +294,7 @@ rte_latencystats_init(uint64_t app_samp_intvl,
 		for (qid = 0; qid < dev_info.nb_tx_queues; qid++) {
 			cbs = &tx_cbs[pid][qid];
 			cbs->cb =  rte_eth_add_tx_callback(pid, qid,
-					calc_latency, user_cb);
+					calc_latency, NULL);
 			if (!cbs->cb)
 				LATENCY_STATS_LOG(NOTICE,
 					"Failed to register Tx callback for pid=%u, qid=%u",
-- 
2.43.0