After further investigation, it looks like this is not the issue. The issues 
are:

1. Make looks for asm/types.h, but there is only asm-generic/types.h in 
include/uapi/linux folder. This can be addressed by creating a symbolic link to 
asm-generic in the same folder. It does address the kernel module building 
error, but is it supposed to addressed this way?
2. Most header files in arch/arm/include/asm in the kernel source are not 
copied to SDK. It is not relevant to the kernel module building so far, but is 
it is supposed to be like this?
3. Some header files that don't exist in the kernel source and supposed to be 
generated during building process, like arch/arm64/include/asm/cpucaps.h, are 
not generated in the SDK. So, h ow to control the Yocto SDK generation so that 
these files are generated in SDK?

Any input will be appreciated. Thanks!

Crane
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