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SubjectRe: SMP in 2.4
> 	testb %al, intr_pending
> jnz somewhere_away_to_handle_defered_interrupt
> And - of course - interrupt checks intr_lock in its entry and if it is
> zero, sets intr_pending and exits immediatelly.

And immediately gets called again. You have to mask the irq which is non trivial
especially if you want to do it right on the BX. But you can do this and rtlinux

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