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The problem is various drivers legally validly and sensibly try to claim IRQs but the kernel insists on vomiting forth a giant irrelevant debugging spew when the types clash. Edit kernel/irq/manage.c go down to mismatch: in setup_irq() and ifdef out the if clause that checks for mismatches. It'll then just do the right thing and work sanely. For the current -mm kernel this will do the trick (and moves it into shared irq debugging as in debug mode the info spew is useful). I've had a variant of this in my private tree for some time as I got fed up on the mess on boxes where old legacy IRQs get reused. Signed-off-by: Alan Cox <[email protected]> Cc: Arjan van de Ven <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: David Woodhouse <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>