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insmod problem

i am new to module programming . i read lkmpg by Ori Pomerantz . and tried to execute some of the 
examples given there.  hello.c ran fine . but the other 2 examples sleep.c & chardev.c get complied 
with 2 warnings . one of which is 
chrdev.c:85: warning: implicit declaration of function `sprintf_R3c2c5af5'
and other is replated to printk

now on insmod they give following error
chrdev.o: unresolved symbol __put_user_X

how to fix it up . any links to some good tutorials on this + mailing lists 

when i copied the message from buffer to user segment directly without using put_user it runs OK

reply soon

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