> > Lastly an IRQ kernel module can disable_irq() from interrupt handler
> > and enable it again only on explicit acknowledge from user.
>
> Unless you need that interrupt to be enabled to deliver the signal or let
Need not. Signal and other event delivery mechanisms has nothing
common with disable/enable_irq().
> userspace reenable the interrupt.
"user acknowledge" is mean that.
> In addition, how do you handle shared interrupts ?
It is impossible, see my another message.
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