On Sun, 3 Oct 2010, Eric W. Biederman wrote: > Thomas Gleixner <tglx@xxxxxxxxxxxxx> writes: > > > The descriptors are already initialized in exaclty this way. > > They aren't only status is initialized exactly that way. Err. SPARSE_IRQ=n: struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = { [0 ... NR_IRQS-1] = { .status = IRQ_DISABLED, .chip = &no_irq_chip, .handle_irq = handle_bad_irq, .depth = 1, .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock), } }; So action == NULL and depth == 1 SPARSE_IRQ=y: allocates with kzalloc which makes action == NULL and depth is set in the init function to 1. That's true for mainline and after the rework as well. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html