Bug#11829813 UNUSED MUTEX COMMIT_THREADS_M

[Merge from 5.1]

storage/innobase/handler/ha_innodb.cc

@@ -101,7 +101,6 @@ static mysql_mutex_t innobase_share_mutex;
 /** to force correct commit order in binlog */
 static mysql_mutex_t prepare_commit_mutex;
 static ulong commit_threads = 0;
-static mysql_mutex_t commit_threads_m;
 static mysql_cond_t commit_cond;
 static mysql_mutex_t commit_cond_m;
 static bool innodb_inited = 0;
@@ -218,12 +217,10 @@ static const char* innobase_change_buffering_values[IBUF_USE_COUNT] = {
 performance schema */
 static mysql_pfs_key_t	innobase_share_mutex_key;
 static mysql_pfs_key_t	prepare_commit_mutex_key;
-static mysql_pfs_key_t	commit_threads_m_key;
 static mysql_pfs_key_t	commit_cond_mutex_key;
 static mysql_pfs_key_t	commit_cond_key;
 
 static PSI_mutex_info	all_pthread_mutexes[] = {
-        {&commit_threads_m_key, "commit_threads_m", 0},
         {&commit_cond_mutex_key, "commit_cond_mutex", 0},
         {&innobase_share_mutex_key, "innobase_share_mutex", 0},
         {&prepare_commit_mutex_key, "prepare_commit_mutex", 0}
@@ -2568,8 +2565,6 @@ innobase_change_buffering_inited_ok:
 			 MY_MUTEX_INIT_FAST);
 	mysql_mutex_init(prepare_commit_mutex_key,
 			 &prepare_commit_mutex, MY_MUTEX_INIT_FAST);
-	mysql_mutex_init(commit_threads_m_key,
-			 &commit_threads_m, MY_MUTEX_INIT_FAST);
 	mysql_mutex_init(commit_cond_mutex_key,
 			 &commit_cond_m, MY_MUTEX_INIT_FAST);
 	mysql_cond_init(commit_cond_key, &commit_cond, NULL);
@@ -2618,7 +2613,6 @@ innobase_end(
 		my_free(internal_innobase_data_file_path);
 		mysql_mutex_destroy(&innobase_share_mutex);
 		mysql_mutex_destroy(&prepare_commit_mutex);
-		mysql_mutex_destroy(&commit_threads_m);
 		mysql_mutex_destroy(&commit_cond_m);
 		mysql_cond_destroy(&commit_cond);
 	}