good explanation of __read_mostly, __init, __exit macros,

Hi,

The macro expansion of __read_mostly :

#define __read_mostly __attribute__((__section__(".data..read_mostly"))

This one is from cache.h

__init:
#define __init		__section(.init.text) __cold notrace

from init.h

__exit:

#define __exit          __section(.exit.text) __exitused __cold notrace

After searching through net i have not found any good explanation of
what is happening there.

Additonal question : I have heard about various "linker magic"
employed in kernel development. Any information
regarding this will be wonderful.

cheers

-- 
-aft