> Actually, is the clear operation really necessary?
> IMHO the best clear is movw $0x03, %gs, then all accesses through %gs will
> trap. Calling set_thread_area (0, 1); will result in 0xb segment
> acting exactly like %ds or %es.
At least on x86-64 it is useful to have a clear operation, because setting the
thread descriptors adds some cost to the context switch for various reasons.
This way processes you could disable it again when they don't need it anymore.
-Andi
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