Re: [Xen-devel] [PATCH for-4.5 6/8] xen/arm: IRQ: Add lock contrainst for gic_irq_{startup, shutdown}

[Julien Grall <julien.grall@xxxxxxxxxx>]

Adding Keir and Jan.

On 02/19/2014 02:38 PM, Ian Campbell wrote:
> On Wed, 2014-02-19 at 14:35 +0000, Julien Grall wrote:
> 
>>>> -static void gic_irq_enable(struct irq_desc *desc)
>>>> +static unsigned int gic_irq_startup(struct irq_desc *desc)
>>>
>>> unsigned? What are the error codes here going to be?
>>
>> This is the return type requested by hw_interrupt_type.startup.
>>
>> It seems that the return is never checked (even in x86 code). Maybe we
>> should change the prototype of hw_interrupt_type.startup.
> 
> Worth investigating. I wonder if someone thought this might return the
> resulting interrupt number (those are normally unsigned int I think) or
> if it actually did used to etc.

I think it was copied from Linux which also have unsigned int. I gave a
quick look to the code and this callback is only used in 2 places which
always return 0.

Surprisingly, the wrapper irq_startup (kernel/irq/manage.c) is returning
an int...

I can create a patch to return void instead of unsigned if everyone is
happy with this solution.

-- 
Julien Grall

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