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update unavailable link in linux-interrupts-2.md

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Interrupts/linux-interrupts-2.md
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@ -441,7 +441,7 @@ static inline void _set_gate(int gate, unsigned type, void *addr,
}
```
Here we start from the `pack_gate` function which takes clean `IDT` entry represented by the `gate_desc` structure and fills it with the base address and limit, [Interrupt Stack Table](https://www.kernel.org/doc/Documentation/x86/x86_64/kernel-stacks), [Privilege level](http://en.wikipedia.org/wiki/Privilege_level), type of an interrupt which can be one of the following values:
Here we start from the `pack_gate` function which takes clean `IDT` entry represented by the `gate_desc` structure and fills it with the base address and limit, [Interrupt Stack Table](https://www.kernel.org/doc/Documentation/x86/kernel-stacks), [Privilege level](http://en.wikipedia.org/wiki/Privilege_level), type of an interrupt which can be one of the following values:
* `GATE_INTERRUPT`
* `GATE_TRAP`