linux-kernel - Re: [PATCH] genirq: error reporting for non-percpu interrupt in request_percpu

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Date:	Fri, 18 Oct 2013 19:42:44 +0530
From:	Vinayak Kale <vkale@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH] genirq: error reporting for non-percpu interrupt in request_percpu_irq()

On Fri, Oct 18, 2013 at 4:33 PM, Vinayak Kale <vkale@....com> wrote:
> Hi Will,
>
>
> On Fri, Oct 18, 2013 at 4:01 PM, Will Deacon <will.deacon@....com> wrote:
>> On Fri, Oct 18, 2013 at 11:06:29AM +0100, Vinayak Kale wrote:
>>> Return a separate error code when a non-percpu interrupt is passed to
>>> request_percpu_irq().
>>>
>>> Suggested-by: Will Deacon <will.deacon@....com>
>>> Signed-off-by: Vinayak Kale <vkale@....com>
>>> ---
>>>  kernel/irq/manage.c |    6 ++++--
>>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
>>> index 514bcfd..c2713ae 100644
>>> --- a/kernel/irq/manage.c
>>> +++ b/kernel/irq/manage.c
>>> @@ -1671,10 +1671,12 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
>>>               return -EINVAL;
>>>
>>>       desc = irq_to_desc(irq);
>>> -     if (!desc || !irq_settings_can_request(desc) ||
>>> -         !irq_settings_is_per_cpu_devid(desc))
>>> +     if (!desc || !irq_settings_can_request(desc))
>>>               return -EINVAL;
>>>
>>> +     if (!irq_settings_is_per_cpu_devid(desc))
>>> +             return -EPERM;
>>
>> <bikeshedding> I reckon -ENODEV is clearer here. </bikeshedding>
>
> I looked at the issue as "operation not allowed since interrupt is
> non-percpu" and I found below comment for EPERM in
> 'include/uapi/asm-generic/errno-base.h' . So thought this error code
> could be more fitting.
>
> #define EPERM            1      /* Operation not permitted */
>
>>
>> Also, there's a counterpart to this code in request_threaded_irq, where I
>> think we should do something similar.
>
> So in request_threaded_irq, we would still keep the WARN_ON for percpu
> interrupt and return a different error code. Is my understanding
> correct?

Please ignore my this comment.
If we do something similar in request_threaded_irq then we will have
to remove WARN_ON for percpu interrupt.
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