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SubjectRe: [PATCH v5 02/33] genirq: Add irq_alloc_reserved_desc()
On Wed, Jan 22, 2014 at 4:03 PM, Thomas Gleixner <> wrote:
> There is a clear step by step approach to get this done proper:
> 1) Get rid of the existing misconception/misnomer of
> irq_reserve_irqs().
> Make it explicit that this is dealing with legacy irq spaces. It's
> not that hard as there are only two users in tree which are both
> trivial to fix.

Hi, Thomas,

While going through the code for kill irq_reserve_irqs(), I found that
there is irq_reserve_irq().

in include/linux/irq.h

static inline int irq_reserve_irq(unsigned int irq)
return irq_reserve_irqs(irq, 1);

it is called via kernel/irq/chip.c::irq_set_chip().

* For !CONFIG_SPARSE_IRQ make the irq show up in
* allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is
* already marked, and this call is harmless.

There are tens of irq_set_chip... calling for arches that does not
support SPARSE_IRQ yet, and they does not use irq_alloc_desc()

so how about change those irq_reserve_irq to irq_set_allocated_irqs() and
leave them there?



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