[v10,02/10] eal: move OS common options functions

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 6b909ce914..24b223ebfd 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -146,6 +146,29 @@  static int master_lcore_parsed;
 static int mem_parsed;
 static int core_parsed;
 
+/* Allow the application to print its usage message too if set */
+static rte_usage_hook_t rte_application_usage_hook;
+
+/* Returns rte_usage_hook_t */
+rte_usage_hook_t
+eal_get_application_usage_hook(void)
+{
+	return rte_application_usage_hook;
+}
+
+/* Set a per-application usage message */
+rte_usage_hook_t
+rte_set_application_usage_hook(rte_usage_hook_t usage_func)
+{
+	rte_usage_hook_t old_func;
+
+	/* Will be NULL on the first call to denote the last usage routine. */
+	old_func = rte_application_usage_hook;
+	rte_application_usage_hook = usage_func;
+
+	return old_func;
+}
+
 #ifndef RTE_EXEC_ENV_WINDOWS
 static char **eal_args;
 static char **eal_app_args;
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index be4d0a8dbc..46bcae9305 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -690,4 +690,13 @@  eal_set_runtime_dir(char *run_dir, size_t size);
 struct internal_config *
 eal_get_internal_configuration(void);
 
+/**
+ * Get the current value of the rte_application_usage pointer
+ *
+ * @return
+ *   Pointer to the current value of rte_application_usage .
+ */
+rte_usage_hook_t
+eal_get_application_usage_hook(void);
+
 #endif /* _EAL_PRIVATE_H_ */
diff --git a/lib/librte_eal/freebsd/eal.c b/lib/librte_eal/freebsd/eal.c
index 766a52b76c..9326c8270a 100644
--- a/lib/librte_eal/freebsd/eal.c
+++ b/lib/librte_eal/freebsd/eal.c
@@ -56,8 +56,6 @@ 
 
 #define MEMSIZE_IF_NO_HUGE_PAGE (64ULL * 1024ULL * 1024ULL)
 
-/* Allow the application to print its usage message too if set */
-static rte_usage_hook_t	rte_application_usage_hook = NULL;
 /* define fd variable here, because file needs to be kept open for the
  * duration of the program, as we hold a write lock on it in the primary proc */
 static int mem_cfg_fd = -1;
@@ -418,28 +416,17 @@  rte_config_init(void)
 static void
 eal_usage(const char *prgname)
 {
+	rte_usage_hook_t hook = eal_get_application_usage_hook();
+
 	printf("\nUsage: %s ", prgname);
 	eal_common_usage();
 	/* Allow the application to print its usage message too if hook is set */
-	if ( rte_application_usage_hook ) {
+	if (hook) {
 		printf("===== Application Usage =====\n\n");
-		rte_application_usage_hook(prgname);
+		(hook)(prgname);
 	}
 }
 
-/* Set a per-application usage message */
-rte_usage_hook_t
-rte_set_application_usage_hook( rte_usage_hook_t usage_func )
-{
-	rte_usage_hook_t	old_func;
-
-	/* Will be NULL on the first call to denote the last usage routine. */
-	old_func					= rte_application_usage_hook;
-	rte_application_usage_hook	= usage_func;
-
-	return old_func;
-}
-
 static inline size_t
 eal_get_hugepage_mem_size(void)
 {
diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
index e7068f198b..3b56d14da1 100644
--- a/lib/librte_eal/linux/eal.c
+++ b/lib/librte_eal/linux/eal.c
@@ -69,9 +69,6 @@ 
 
 #define KERNEL_IOMMU_GROUPS_PATH "/sys/kernel/iommu_groups"
 
-/* Allow the application to print its usage message too if set */
-static rte_usage_hook_t	rte_application_usage_hook = NULL;
-
 /* define fd variable here, because file needs to be kept open for the
  * duration of the program, as we hold a write lock on it in the primary proc */
 static int mem_cfg_fd = -1;
@@ -532,6 +529,8 @@  eal_hugedirs_unlock(void)
 static void
 eal_usage(const char *prgname)
 {
+	rte_usage_hook_t hook = eal_get_application_usage_hook();
+
 	printf("\nUsage: %s ", prgname);
 	eal_common_usage();
 	printf("EAL Linux options:\n"
@@ -546,25 +545,12 @@  eal_usage(const char *prgname)
 	       "  --"OPT_MATCH_ALLOCATIONS" Free hugepages exactly as allocated\n"
 	       "\n");
 	/* Allow the application to print its usage message too if hook is set */
-	if ( rte_application_usage_hook ) {
+	if (hook) {
 		printf("===== Application Usage =====\n\n");
-		rte_application_usage_hook(prgname);
+		(hook)(prgname);
 	}
 }
 
-/* Set a per-application usage message */
-rte_usage_hook_t
-rte_set_application_usage_hook( rte_usage_hook_t usage_func )
-{
-	rte_usage_hook_t	old_func;
-
-	/* Will be NULL on the first call to denote the last usage routine. */
-	old_func					= rte_application_usage_hook;
-	rte_application_usage_hook	= usage_func;
-
-	return old_func;
-}
-
 static int
 eal_parse_socket_arg(char *strval, volatile uint64_t *socket_arg)
 {
diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
index 11801e6093..8333d5977e 100644
--- a/lib/librte_eal/windows/eal.c
+++ b/lib/librte_eal/windows/eal.c
@@ -24,9 +24,6 @@ 
 
 #define MEMSIZE_IF_NO_HUGE_PAGE (64ULL * 1024ULL * 1024ULL)
 
- /* Allow the application to print its usage message too if set */
-static rte_usage_hook_t	rte_application_usage_hook;
-
 /* define fd variable here, because file needs to be kept open for the
  * duration of the program, as we hold a write lock on it in the primary proc
  */
@@ -72,14 +69,16 @@  eal_proc_type_detect(void)
 static void
 eal_usage(const char *prgname)
 {
+	rte_usage_hook_t hook = eal_get_application_usage_hook();
+
 	printf("\nUsage: %s ", prgname);
 	eal_common_usage();
 	/* Allow the application to print its usage message too
 	 * if hook is set
 	 */
-	if (rte_application_usage_hook) {
+	if (hook) {
 		printf("===== Application Usage =====\n\n");
-		rte_application_usage_hook(prgname);
+		(hook)(prgname);
 	}
 }