compile single kernel file
I've added system calls before. AFAIK, you need to compile the entire kernel because the system call table is static within the kernel.
However, when you hit make on the kernel, the kernel building system should workout the dependencies and only compile the files which need to be compiled.
Rebuild linux kernel module for another architecture
You could try:
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- M=path/to/the/module/
Also read:
Cross compiling a kernel module
gcc-arm-linux-gnueabi command not found
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