[PKT_SCHED]: Introduce gen_replace_estimator

Introduces gen_replace_estimator.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/gen_stats.h

@@ -41,5 +41,8 @@ extern int gen_new_estimator(struct gnet_stats_basic *bstats,
 			     spinlock_t *stats_lock, struct rtattr *opt);
 extern void gen_kill_estimator(struct gnet_stats_basic *bstats,
 			       struct gnet_stats_rate_est *rate_est);
+extern int gen_replace_estimator(struct gnet_stats_basic *bstats,
+				 struct gnet_stats_rate_est *rate_est,
+				 spinlock_t *stats_lock, struct rtattr *opt);
 
 #endif

net/core/gen_estimator.c

@@ -200,5 +200,16 @@ void gen_kill_estimator(struct gnet_stats_basic *bstats,
 	}
 }
 
+int
+gen_replace_estimator(struct gnet_stats_basic *bstats,
+	struct gnet_stats_rate_est *rate_est, spinlock_t *stats_lock,
+	struct rtattr *opt)
+{
+    gen_kill_estimator(bstats, rate_est);
+    return gen_new_estimator(bstats, rate_est, stats_lock, opt);
+}
+    
+
 EXPORT_SYMBOL(gen_kill_estimator);
 EXPORT_SYMBOL(gen_new_estimator);
+EXPORT_SYMBOL(gen_replace_estimator);