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The Linux kernel configuration item CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK:

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Architecture doesn't only execute the irq handler on the irq stack but also irq_exit(). This way we can process softirqs on this irq stack instead of switching to a new one when we call __do_softirq() in the end of an hardirq. This spares a stack switch and improves cache usage on softirq processing.



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