[PATCH 0/2] drm: revert some framebuffer API tests

[Maxime Ripard]

On Tue, Sep 24, 2024 at 06:37:59AM GMT, Guenter Roeck wrote:
> On 9/24/24 04:54, Maxime Ripard wrote:
> > +Guenter
> > 
> > On Tue, Sep 24, 2024 at 12:06:28PM GMT, Simona Vetter wrote:
> > > On Tue, Sep 17, 2024 at 08:43:50PM +0300, Jani Nikula wrote:
> > > > The tests consistently trigger WARNs in drm_framebuffer code. I'm not
> > > > sure what the point is with type of belts and suspenders tests. The
> > > > warnings *are* the way to flag erroneous API usage.
> > > > 
> > > > Warnings in turn trigger failures in CI. Filtering the warnings are
> > > > error prone, and, crucially, would also filter actual errors in case the
> > > > kunit tests are not run.
> > > > 
> > > > I acknowledge there may be complex test cases where you'd end up
> > > > triggering warnings somewhere deep, but these are not it. These are
> > > > simple.
> > > > 
> > > > Revert the tests, back to the drawing board.
> > > 
> > > Yeah I think long-term we might want a kunit framework so that we can
> > > catch dmesg warnings we expect and test for those, without those warnings
> > > actually going to dmesg. Similar to how the lockdep tests also reroute
> > > locking validation, so that the expected positive tests don't wreak
> > > lockdep for real.
> > > 
> > > But until that exists, we can't have tests that splat in dmesg when they
> > > work as intended.
> > 
> > It should be pretty soon:
> > https://lore.kernel.org/dri-devel/20240403131936.787234-1-linux@roeck-us.net/
> > 
> > I'm not sure what happened to that series, but it looks like everybody
> > was mostly happy with it?
> > 
> 
> Major subsystem maintainers did not provide any feedback at all, and then
> there came the "it is not perfect enough" feedback, so I gave up on it.

Well, if that means anything, we're interested even in something
imperfect if it solves the above case :)

Maxime
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 273 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20240924/7508ccf3/attachment-0001.sig>