Some Question about kbuild makefile
 

Hello, I'm a student from China, and I'm modifying the linux kernel to add some security functions to the Linux kernel. Now I have faced some some problems about Makefile in linux kernel, so I send this mail to ask for your help.

I have added some files into the folder linux-2.6.27/security. The following picture is the file architecture of the files I have added.
----------------------------------------------------------
linux-2.6.27/
####|--security/
########|--*Makefile
########|--&seclinux/
############|--Makefile
############|--audit/
################|--***.c
################|--Makefile
----------------------------------------------------------
The symbol '*' before linux-2.6.27/security/Makefile means that I have modified the original linux-2.6.27/security/Makefile. The symbol '&' before linux-2.6.27/security/seclinux/ means that the seclinux folder is newly added into the linux-2.6.27/security/ folder by me.

First: I have modified the original linux-2.6.27/security/Makefile. I added the following two lines into the file:
subdir-y +=seclinux
obj-y +=seclinux/built-in.o

Second: I creat the linux-2.6.27/security/seclinux/Makefile, and its content is:
subdir-y +=audit
obj-y += audit/built-in.o

Third: I create the linux-2.6.27/security/seclinux/audit/Makefile, and its content is:
obj-y += sec_audit.o
sec_audit-y := ***.o ***.o ****.o ...


I am uncertain whether I am correct to do like this. May you check and tell me whether I am correct?
And I have read the kbuild document in linux-2.6.27/Document/kbuild, and I think its content is so little, can you send me some more detailed document about kbuild? And you can get my e-mail addr from my profile.