VT paramter doesn't take effect - global_cursor_default

Hi, I was trying to set a module parameter for vt.c, I set it in command line as "global_cursor_default=0". After that, I debug the kernel by printing and check the /sys/modules/vt/parameters/global_cursor_default, all found the parameter did not take effect. The corresponding static variable is still keep its default value of -1. What's wrong with my operations? Thanks in advance. -- I can't go back to yesterday - because I was a different person then