linux-kernel - Re: [PATCH v8 kunit-next 1/4] kunit: add debugfs /sys/kernel/debug/kunit/<suite>/results display

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Date:   Thu, 2 Apr 2020 16:27:35 +0100 (BST)
From:   Alan Maguire <alan.maguire@...cle.com>
To:     shuah <shuah@...nel.org>
cc:     Alan Maguire <alan.maguire@...cle.com>, brendanhiggins@...gle.com,
        frowand.list@...il.com, gregkh@...uxfoundation.org,
        linux-kselftest@...r.kernel.org, corbet@....net,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v8 kunit-next 1/4] kunit: add debugfs
 /sys/kernel/debug/kunit/<suite>/results display

On Wed, 1 Apr 2020, shuah wrote:

> Hi Alan,
> 
> On 3/26/20 8:25 AM, Alan Maguire wrote:
> > add debugfs support for displaying kunit test suite results; this is
> > especially useful for module-loaded tests to allow disentangling of
> > test result display from other dmesg events.  debugfs support is
> > provided if CONFIG_KUNIT_DEBUGFS=y.
> > 
> > As well as printk()ing messages, we append them to a per-test log.
> > 
> > Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> > Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> > Reviewed-by: Frank Rowand <frank.rowand@...y.com>
> > ---
> >   include/kunit/test.h   |  54 +++++++++++++++---
> >   lib/kunit/Kconfig      |   8 +++
> 
> Missing defaults for config options?
> 
> >   lib/kunit/Makefile     |   4 ++
> >   lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
> >   lib/kunit/debugfs.h    |  30 ++++++++++
> >   lib/kunit/kunit-test.c |   4 +-
> >   lib/kunit/test.c       | 147
> >   ++++++++++++++++++++++++++++++++++++++-----------
> >   7 files changed, 322 insertions(+), 41 deletions(-)
> >   create mode 100644 lib/kunit/debugfs.c
> >   create mode 100644 lib/kunit/debugfs.h
> > 
> 
> snip
> 
> > diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> > index 065aa16..95d12e3 100644
> > --- a/lib/kunit/Kconfig
> > +++ b/lib/kunit/Kconfig
> > @@ -14,6 +14,14 @@ menuconfig KUNIT
> >   
> >   if KUNIT
> >   
> > +config KUNIT_DEBUGFS
> > +	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
> > +	help
> > +	  Enable debugfs representation for kunit.  Currently this consists
> > +	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
> > +	  test suite, which allow users to see results of the last test suite
> > +	  run that occurred.
> > +
> 
> Any reason why there is default for this option?
> 
> Same for all other options. I am sending pull request for now without
> defaults. Would like to see this fixed for rc2.
>

Sure, I'll send a patch shortly. Just wanted to get opinions
on what those defaults should be; my working assumption is

- CONFIG_KUNIT should be default n; 
- CONFIG_KUNIT_DEBUGFS should be default y (enabled by default
  if CONFIG_KUNIT is set);
- CONFIG_KUNIT_TEST, CONFIG_KUNIT_EXAMPLE_TEST should be default n

Does this sound right? Thanks!

Alan

> thanks,
> -- Shuah
>