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Update interrupts-8.md

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fix some topys
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Dou Liyang
2017-01-10 14:00:09 +08:00
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Interrupts/interrupts-8.md
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@@ -241,7 +241,7 @@ do { \
} while (0)
```
As we can see, first of all it expands to the call of the `alloc_system_vector` function that checks the given vector number in the `user_vectors` bitmap (read previous [part](http://0xax.gitbooks.io/linux-insides/content/Interrupts/interrupts-7.html) about it) and if it is not set in the `user_vectors` bitmap we set it. After this we test that the `first_system_vector` is greater than given interrupt vector number and if it is greater we assign it:
As we can see, first of all it expands to the call of the `alloc_system_vector` function that checks the given vector number in the `used_vectors` bitmap (read previous [part](http://0xax.gitbooks.io/linux-insides/content/Interrupts/interrupts-7.html) about it) and if it is not set in the `used_vectors` bitmap we set it. After this we test that the `first_system_vector` is greater than given interrupt vector number and if it is greater we assign it:
```C
if (!test_bit(vector, used_vectors)) {