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Update linux-sync-4.md

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From "may be negative after `increment`"
=>"may be negative after `decrement`"
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@ -205,7 +205,7 @@ exit:
return;
```
For this moment the implementation of the `__mutex_fastpath_lock` function looks pretty easy. But the value of the `mutex->counter` may be negative after increment. In this case the:
For this moment the implementation of the `__mutex_fastpath_lock` function looks pretty easy. But the value of the `mutex->counter` may be negative after decrement. In this case the:
```C
fail_fn(v);