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Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an existing mapping

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On Tue, Dec 22, 2015 at 10:58 AM, Linus Walleij
<linus.walleij@linaro.org> wrote:
> On Fri, Dec 18, 2015 at 11:10 AM, Jon Hunter <jonathanh@nvidia.com> wrote:
>> On 17/12/15 13:16, Linus Walleij wrote:
>>> On Thu, Dec 17, 2015 at 11:48 AM, Jon Hunter <jonathanh@nvidia.com> wrote:
>>>> +               } else {
>>>> +                       virq = irq_domain_alloc_descs(-1, 1, hwirq,
>>>> +                                                     of_node_to_nid(of_node));
>>>
>>> What is this all of a sudden? Not even mentioned in the
>>> commit. Plus I bet ACPI need something else than OF nid
>>> passed here.
>>
>> Do you mean the else part of all of the above?
>
> Yes
>
>> So in the current code, the else part calls irq_create_mapping() (...)
>
> No, not that... The fact that you all of a sudden have started
> calling irq_domain_alloc_descs() which the function didn't do
> before, totally changing the calling semantics for everyone in
> the kernel, leading to the problem I then describe with this
> potentially being called before the irqdomain for the irqchip
> is initialized and descs getting "random" numbers.

I see I didn't go into those details in my first answer. Hm, I
guess I got uncertain and deleted it because I remember
writing it...

I am simply worries that starting to call irq_domain_alloc_descs()
has unintended side effects, especially on platforms using
legacy or simple irqdomains.

Yours,
Linus Walleij
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[RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an existing mapping Jon Hunter <jonathanh@nvidia.com> - 2015-12-17 12:00 +0100
  Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Linus Walleij <linus.walleij@linaro.org> - 2015-12-17 14:20 +0100
    Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Jon Hunter <jonathanh@nvidia.com> - 2015-12-18 11:20 +0100
      Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Linus Walleij <linus.walleij@linaro.org> - 2015-12-22 11:00 +0100
        Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Linus Walleij <linus.walleij@linaro.org> - 2015-12-22 11:10 +0100
          Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Jon Hunter <jonathanh@nvidia.com> - 2015-12-22 12:30 +0100
          Re: [RFC PATCH V2 1/8] irqdomain: Ensure type settings match for an  existing mapping Grygorii Strashko <grygorii.strashko@ti.com> - 2015-12-22 12:40 +0100

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