Why linux kernel use trap gate to handle divide_error exception?

Question

In kernel 2.6.11.5, divide zero exception handler is set up as:

set_trap_gate(0,÷_error);

According to \"Understanding The Linux

Answer 1

DPL bit in IDT is looked at only when software interrupt is called with the int instruction. Division by zero is a software interrupt triggered by the CPU and thus has DPL has no effect in this case