What script is included with the kernel source to patch a kernel?

A.
patch-kernel

B.
update-kernel

C.
patch

D.
apply-patch

Explanation:
The linux/scripts/patch-kernel is a Perl program that attempts to automate this process, patch-kernel will deduce the current source version number and compare this to the patch files found in the current directory. If higher-version patch files are found, the script will step through these sequentially upgrading the sources. Frankly, I have never had much luck with this script, but your mileage may vary.