Re: [Xen-devel] [PATCH v3 05/10] xen/arm: Setup virtual paging for non-boot CPUs on hotplug/resume

[Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>]

Hi Julien,

On Tue, May 8, 2018 at 4:14 PM, Julien Grall <julien.grall@xxxxxxx> wrote:
>
>
> On 07/05/18 15:55, Mirela Simonovic wrote:
>>
>> Hi Julien,
>
>
> Hi Mirela,
>
>> On Mon, Apr 30, 2018 at 4:47 PM, Julien Grall <julien.grall@xxxxxxx>
>> wrote:
>>>
>>> On 27/04/18 18:12, Mirela Simonovic wrote:
>>>>
>>>>        printk("P2M: %d levels with order-%d root, VTCR 0x%lx\n",
>>>> -           4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, val);
>>>> +           4 - P2M_ROOT_LEVEL, P2M_ROOT_ORDER, vtcr);
>>>>          p2m_vmid_allocator_init();
>>>>          /* It is not allowed to concatenate a level zero root */
>>>>        BUG_ON( P2M_ROOT_LEVEL == 0 && P2M_ROOT_ORDER > 0 );
>>>> -    setup_virt_paging_one((void *)val);
>>>> -    smp_call_function(setup_virt_paging_one, (void *)val, 1);
>>>> +    setup_virt_paging_one(NULL);
>>>> +    smp_call_function(setup_virt_paging_one, NULL, 1);
>>>> +}
>>>> +
>>>> +static int cpu_virt_paging_callback(
>>>> +    struct notifier_block *nfb, unsigned long action, void *hcpu)
>>>
>>>
>>>
>>> The indentation looks wrong.
>>>
>>
>> Editor indented this for me and it looks the same as in other places
>> where a notifier is defined. I did
>> grep -r "struct notifier_block \*nfb,"
>> to check. It looks weird but seems correct
>
>
> Indeed, I am not sure why it is done like that for notifiers. I can't see
> any reason to split like that given the first parameter can fit on the first
> line without hitting the 80 columns.
>
> So I would much prefer if we follow Xen coding style:
>
> static int cpu_virt_paging_callback(struct notifier_block *nfb,
>                                     unsigned long action,
>                                     void *hcpu);
>

Please just one more clarification: why did you split line after 2nd
argument? 3rd argument could fit in 80 chars.
The only coding style I found is in CODING_STYLE file, which doesn't
specify that much details - I'm just trying to understand where to
find more info in order to avoid coding style-related iterations in
future. Is there any other source specifying coding style for Xen?

Thanks,
Mirela

> Cheers,
>
> --
> Julien Grall

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