1.I find that a macro called CONFIG_SERIAL_SHARE_IRQ is used for sharing
Interrupts.
If this is set then serial.c can be used for shared interrupts.
But I checked in arch/i386/kernel/irq.c the function
set_x86_irq tells that sharing can happen If we set flag to SA_SHIRQ
Without this being set the interrupt is being shared by two modems using
serial.c How is this possible?
2.If the flag is set to fast interrupt(SA_INTERRUPT) will I be able to
have
shared interrupts.
Should I set the flag to slow and do sharing of interrupts.
3.And what is significance of dev_id in sharing of interrupts?
As in free_irq function based on dev_id the interrupt is shared.
4.By sharing of interrupts the machine is slow . will this happen due to
sharing?
If so how to overcome this.
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