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Because the application space and the kernel space are separately built and separately linked in the PROTECTED and KERNEL builds. No application addresses are known by the kernel and no kernel addresses are known by the application (applications interface via system call traps, not C function calls). So what address would the kernel thread provide for the pthread entry point? A known kernel space address? Of course, the system would crash with a memory fault immediately if a protected address were executed in user mode.

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