Messages in this thread | | | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable | From | Robert Love <> | Date | 13 Jan 2002 13:20:08 -0500 |
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On Sun, 2002-01-13 at 10:59, Alan Cox wrote: > > I disable a single specific interrupt, I don't disable the timer interrupt. > > Your code doesn't seem to handle that. > > It can if we increment the preempt_count in disable_irq_nosync and > decrement it on enable_irq.
OK, Alan, you spooked me with the disable_irq mess and admittedly my initial solution wasn't ideal for a few reasons.
But it isn't a problem after all. In hw_irq.h we bump the count in the interrupt path. This should handle any handler, however we end up in it.
I realized it because if we did not have a global solution to interrupt request handlers, dropping spinlocks in the handler, even with IRQs disabled, would cause a preemptive schedule. All interrupts are properly protected.
Robert Love
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