Linus Torvalds wrote:

On Tue, 20 Mar 2007, Eric W. Biederman wrote:
  

quoted

If that is the case.  In the normal kernel what would
the "the oops, we got an interrupt code do?"
I assume it would leave interrupts disabled when it returns?
Like we currently do with the delayed disable of normal interrupts?
    

Yeah, disable interrupts, and set a flag that the fake "sti" can test, and 
just return without doing anything.

(You may or may not also need to do extra work to Ack the hardware 
interrupt etc, which may be irq-controller specific. Once the CPU has 
accepted the interrupt, you may not be able to just leave it dangling)
  

So it would be something like:

    pda.intr_mask = 1;		/* disable interrupts */
    ...
    pda.intr_mask = 0;		/* enable interrupts */
    if (xchg(&pda.intr_pending, 0))	/* check pending */
    	asm("sti");		/* was pending; isr left cpu interrupts masked */
      

and in the interrupt handler:

    if (pda.intr_mask) {
    	pda.intr_pending = 1;
    	regs->eflags &= ~IF;
    	maybe_ack_interrupt_controller();
    	iret
      

    }

?

    J