linux-kernel - Re: [PATCH v4 0/6] Cleanups for the nomodeset kernel command line parameter logic

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Date:   Fri, 12 Nov 2021 11:09:13 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        Pekka Paalanen <ppaalanen@...il.com>
Cc:     Jani Nikula <jani.nikula@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Michel Dänzer <michel@...nzer.net>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Peter Robinson <pbrobinson@...il.com>
Subject: Re: [PATCH v4 0/6] Cleanups for the nomodeset kernel command line
 parameter logic

Hi

Am 12.11.21 um 10:39 schrieb Javier Martinez Canillas:
> Hello Pekka,
> 
> On 11/12/21 09:56, Pekka Paalanen wrote:
> 
> [snip]
> 
>>
>> Hi,
>>
>> these ideas make sense to me, so FWIW,
>>
>> Acked-by: Pekka Paalanen <pekka.paalanen@...labora.com>
>>
> 
> Thanks.
> 
>> There is one nitpick I'd like to ask about:
>>
>> +bool drm_get_modeset(void)
>> +{
>> +     return !drm_nomodeset;
>> +}
>> +EXPORT_SYMBOL(drm_get_modeset);
>>
>> Doesn't "get" have a special meaning in the kernel land, like "take a
>> strong reference on an object and return it"?
> 
> That's a very good point.
> 
>> As this is just returning bool without changing anything, the usual
>> word to use is "is". Since this function is also used at most once per
>> driver, which is rarely, it could have a long and descriptive name.
>>
>> For example:
>>
>> bool drm_is_modeset_driver_allowed(void);

I'd nominate

   bool drm_native_drivers_enabled()

This is what HW-specific drivers want to query in their init/probing 
code. The actual semantics of this decision is hidden from the driver. 
It's also easier to read than the other name IMHO

Best regards
Thomas

>>
> 
> Yeah, naming is hard. Jani also mentioned that he didn't like this
> function name, so I don't mind to re-spin the series only for that.
> 
>> - "drm" is the namespace
>> - "is" implies it is a read-only boolean inspection
>> - "modeset" is the feature being checked
>> - "driver" implies it is supposed gate driver loading or
>>    initialization, rather than modesets after drivers have loaded
>> - "allowed" says it is asking about general policy rather than what a
>>    driver does
>>
> 
> I believe that name is more verbose than needed. But don't have a
> strong opinion and could use it if others agree.
> 
>> Just a bikeshed, I'll leave it to actual kernel devs to say if this
>> would be more appropriate or worth it.
>>
> 
> I think is worth it and better to do it now before the patches land, but
> we could wait for others to chime in.
> 
> Best regards,
> --
> Javier Martinez Canillas
> Linux Engineering
> Red Hat
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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