The interrupt handler function now has a return code of type irqreturn_t.

现在的中断处理函数的返回代码是一个 irqreturn_t 类型。

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The dsirr (Data Storage Interrupt reason Register) indicates the type of page fault that has occurred.

dsirr（数据存储中断原因寄存器）表示发生的页面错误的类型。

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If you are not sure why, you might try making a separate copy of this function for each interrupt type that you catch and see what causes the extra calls.

如果想细究其原因，可以尝试针对每种终止类型获得该函数的单独副本，研究产生额外调用的原因。

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