sys_init_module()

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Hello friends,

I have just started reading the kernel code and hence a kernel newbie. Right now
I am reading the code of Linux kernel version 2.4.3. The file module.c conatins
a function sys_init_module. I am not able to the understand the following LOC.

<snip>

if (mod_user_size < (unsigned long)&((struct module *)0L)->persist_start

</snip>

What does 0L refers to ? Can somebody please explain it to me.

Thanks
neeraj

 

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