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macros

Hi all,

I have couple of questions 

1. what is the purpose of using the following macros in a module

MODULE_AUTHOR(name)
MODULE_DESCRIPTION(desc)
MOD_IN_USE

and can u please suggest what r the other macros that can be used inside a 
module for betterment of the module if any.

2. In the sys_call_table only first 221 postions are occupied by the system 
calls in i386 architecture.What is stored exactly in the remaining positions.
What i want to know exactly is if i try to insert my own sytem call after 
221nd position using a loadable module, should i backup the content(i mean 
the pointer to some function or something)and restore it when the module is 
unloaded.

thanks and regards,
mohan.

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