missing header files

[arup malakar <arup_iitg1@xxxxxxxxx>]

    i am trying to write a module for which i have to
use some kernel functions like rdtscl() , udelay()
etc.
i'm running redhat 9.0 (kernel 2.4.20-6)
     what is the difference between the header files
of 
/usr/include and /usr/src/linux-2.4.20/include/
some functions are missing in the headers of
/usr/include but are present in
/usr/src/linux-2.4.20/include/
         how to solve this problem.


	
		
__________________________________
Do you Yahoo!?
Friends.  Fun.  Try the all-new Yahoo! Messenger.
http://messenger.yahoo.com/ 

--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/