Why each time of kernel compilation must be done completely?

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Hi,

This problem has puzzled me for a long time. A normal C make file could parse the reliance and just regenerate the modified source file. But each time when I modified the kernel and recompile it, it does a complete compilation, no matter whether make mrproper is used or not. It's quite time consuming and inefficient.

So why kernel make file couldn't do what a normal C make file could do? Or maybe it could but I got something wrong? 

If a complete compilation is inevitable, how to make it faster? I only know the -jX option.

Best regards
Michael


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