simple kernel modification question

From: Parag (bunty123_4_at_rediffmail.com)
Date: 05/29/04

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    Date: 29 May 2004 08:21:24 -0700
    
    

    hi
               i have some questions on kernel modification.
    1) If i have to add any functions in kernel source where should i add
    its entry. can you tell me those file names?
    2) and if i am using some variables in that function local to it does
    it require to add its entry and if yes where? and if variable is to be
    exported that is global then what?
    3) how to solve unresolved symbol error?
    4)i want to ask when i compile a new kernel image from installed
    kernel source /usr/src/linux-2.4.20-8/ it create linux-2.4.20-8custom
    kernel version. why it takes that version number and not same
    linux-2.4.20-8?
    regards,
    bunty.


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