what if we want to reuse initialization routines in linux kernel

from so far i have read, i came to know that the function calls that are having a prefix like __init will be placed in a single ELF location for example we usually write

int __init module_start()
{
....
}

so that that particular ELF location can be overridden or deleted later after initialization is over if so ?? if we want to use initialization again or i want to reinitialize any module what is the approach