In a partitioned system, the interrupt cannot be sent to any processor.
在分区的系统中，无法将中断发送到任何处理器。
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Each processor on the CPU has its own CSA (current save area) pointer that points to the MST that is to be used when a thread or interrupt handler is interrupted or swapped due to context switch.
In particular, the Cell processor includes an interrupt controller and an IOMMU implementation, both of which are incompatible with those supported by older kernel versions.