Re: [Xen-devel] [PATCH for-4.5 7/8] xen/irq: Handle multiple action per IRQ

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/01/2014 03:31 PM, Ian Campbell wrote:
> On Tue, 2014-04-01 at 14:52 +0100, Julien Grall wrote:
>> On 04/01/2014 02:23 PM, Ian Campbell wrote:
>>> On Tue, 2014-04-01 at 14:13 +0100, Julien Grall wrote:
>>>>>>  - I need to use 2 variables to search for an element in a list as there 
>>>>>> is
>>>>>>  no way to know after the end of the loop if we found or not an element.
>>>>>
>>>>> You've written that a bit weirdly IMHO.
>>>>>
>>>>> list_for_each(...)
>>>>>    if (not the one we want)
>>>>>   continue
>>>>>    free the one we wanted
>>>>>    break;
>>>>>
>>>>> don't worry about warning on a non-existent IRQ, or set a simple
>>>>> boolean.
>>>>
>>>> We have to worry about non-existent action otherwise Xen may segfault...
>>>
>>> Why? If it doesn't exist we don't do anything.
>>>
>>>
>>
>> We can't free in the loop because the action may be used on another CPU
>> at the same it. (see "active" loop at the end). So I still need two
>> variables (one for the loop and one for the real action).
> 
> Perhaps the "goto found" pattern might help here then?

I'm not a big fan of "goto". But in this case the code might be cleaner.

-- 
Julien Grall

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