Re: [PATCH v2 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework

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On Sat, May 11, 2019 at 01:33:44PM -0400, Theodore Ts'o wrote:
> On Fri, May 10, 2019 at 02:12:40PM -0700, Frank Rowand wrote:
> > However, the reply is incorrect.  Kselftest in-kernel tests (which
> > is the context here) can be configured as built in instead of as
> > a module, and built in a UML kernel.  The UML kernel can boot,
> > running the in-kernel tests before UML attempts to invoke the
> > init process.
> 
> Um, Citation needed?
> 
> I don't see any evidence for this in the kselftest documentation, nor
> do I see any evidence of this in the kselftest Makefiles.
> 
> There exists test modules in the kernel that run before the init
> scripts run --- but that's not strictly speaking part of kselftests,
> and do not have any kind of infrastructure.  As noted, the
> kselftests_harness header file fundamentally assumes that you are
> running test code in userspace.

Yeah I really like the "no userspace required at all" design of kunit,
while still collecting results in a well-defined way (unless the current
self-test that just run when you load the module, with maybe some
kselftest ad-hoc wrapper around to collect the results).

What I want to do long-term is to run these kernel unit tests as part of
the build-testing, most likely in gitlab (sooner or later, for drm.git
only ofc). So that people get their pull requests (and patch series, we
have some ideas to tie this into patchwork) automatically tested for this
super basic stuff.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch



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