Shortcut to compile kernel file ?

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http://www.linuxquestions.org – Dear All, I hope you all are fine ad doing well, I become successful to download kernel, compile it and run it. BUT When i modify tcp.c file or any other file in this /usr/src/linux/net/ipv4 location, (just modifying c files) i have to compile the complete kernel every time, which is very time consuming procedure. So Please help, How to compile that net/ipv4 package or etc... I will be very very thankful to you all... please please guide me.. Mehdi (HowTos)