Certain critical sections of the kernel code are locked against preemption.

可以锁定内核代码的关键部分，不允许抢占。

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Code areas with synchronized access are sometimes called critical sections.

能够进行同步访问的代码块有时称为关键部分。

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For really critical sections of your code, you might consider adding some functional tests as a safety net before you start refactoring.

对于代码中真正关键的部分，可能需要在进行重构之前添加一些功能测试作为一种安全保障。

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