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| 18 | 18 | void asm_call_irq_on_stack(void *sp, void (*func)(struct irq_desc *desc), |
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| 19 | 19 | struct irq_desc *desc); |
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| 20 | 20 | |
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| 21 | +/* |
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| 22 | + * IRQ pipeline: only in-band (soft-)irq handlers have to run on the |
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| 23 | + * irqstack, oob irq handlers must be lean by design therefore can run |
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| 24 | + * directly over the preempted context. Therefore, the guarantee that |
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| 25 | + * the in-band stage is currently stalled on the current CPU is enough |
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| 26 | + * to update irq_count atomically. |
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| 27 | + */ |
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| 21 | 28 | static __always_inline void __run_on_irqstack(void (*func)(void)) |
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| 22 | 29 | { |
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| 23 | 30 | void *tos = __this_cpu_read(hardirq_stack_ptr); |
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