Re: [PATCH 2/2] drm/amdgpu: Add modeset module option

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On Tue, 03 Apr 2018, Michel Dänzer <michel@xxxxxxxxxxx> wrote:
> On 2018-04-03 11:02 AM, Takashi Iwai wrote:
>> Agreed with the naming mess.  But OTOH, it's already a thing that is
>> too popular to kill.  You can add a more suitable option name, but you
>> cannot drop these existing ones easily.  It's already in a gray zone
>> of the golden "don't break user-space" rule.
>
> That's quite a stretch argument, given that amdgpu has never supported
> the modeset parameter.

That much is clear.

> Also, module parameters aren't UAPI.

[citation needed]. I agree with Takashi it's a gray area.

You can have "unsafe" module parameters that taint the kernel when set,
see module_param_unsafe and module_param_named_unsafe. Using those
should make it clear all bets are off.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Technology Center
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