MySQL acl_init comment

sql_auth_cache.cc

/*
  Initialize structures responsible for user/db-level privilege checking and
  load privilege information for them from tables in the 'mysql' database.
  SYNOPSIS
    acl_init()
      dont_read_acl_tables  TRUE if we want to skip loading data from
                            privilege tables and disable privilege checking.
  NOTES
    This function is mostly responsible for preparatory steps, main work
    on initialization and grants loading is done in acl_reload().
  RETURN VALUES
    0   ok
    1   Could not initialize grant's
*/