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Which functions can be used and cannot be used when writing a kernel module?

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Author: User
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Which functions can be used and cannot be used when writing a kernel module? -- Linux general technology-Linux programming and kernel information. The following is a detailed description. After I use memset in a module, an error is reported. I don't know why.
Like a system call, open write seems to be unavailable
Then how can I know what can be used and what cannot be used?
For example, if I want to obtain the system time, I can check the application to find the function and the api used.
But where should I find such a function in the kernel program?

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