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Date:   Fri, 13 Mar 2020 17:03:07 -0700
From:   Brendan Higgins <>
To:     Alan Maguire <>
Cc:     Frank Rowand <>,
        Greg KH <>, shuah <>,
        Jonathan Corbet <>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        Linux Kernel Mailing List <>,
        KUnit Development <>,
        "open list:DOCUMENTATION" <>
Subject: Re: [PATCH v7 kunit-next 0/4] kunit: add debugfs representation to
 show results

On Fri, Mar 13, 2020 at 7:44 AM Alan Maguire <> wrote:
> When kunit tests are run on native (i.e. non-UML) environments, the results
> of test execution are often intermixed with dmesg output.  This patch
> series attempts to solve this by providing a debugfs representation
> of the results of the last test run, available as
> /sys/kernel/debug/kunit/<testsuite>/results
> Changes since v6:
> - fixed regexp parsing in to ensure test results are read
>   successfully with 4-space indentation (Brendan, patch 3)
> Changes since v5:
> - replaced undefined behaviour use of snprintf(buf, ..., buf) in
>   kunit_log() with a function to append string to existing log
>   (Frank, patch 1)
> - added clarification on log size limitations to documentation
>   (Frank, patch 4)
> Changes since v4:
> - added suite-level log expectations to kunit log test (Brendan, patch 2)
> - added log expectations (of it being NULL) for case where
>   CONFIG_KUNIT_DEBUGFS=n to kunit log test (patch 2)
> - added patch 3 which replaces subtest tab indentation with 4 space
>   indentation as per TAP 14 spec (Frank, patch 3)
> Changes since v3:
> - added CONFIG_KUNIT_DEBUGFS to support conditional compilation of debugfs
>   representation, including string logging (Frank, patch 1)
> - removed unneeded NULL check for test_case in
>   kunit_suite_for_each_test_case() (Frank, patch 1)
> - added kunit log test to verify logging multiple strings works
>   (Frank, patch 2)
> - rephrased description of results file (Frank, patch 3)
> Changes since v2:
> - updated kunit_status2str() to kunit_status_to_string() and made it
>   static inline in include/kunit/test.h (Brendan)
> - added log string to struct kunit_suite and kunit_case, with log
>   pointer in struct kunit pointing at the case log.  This allows us
>   to collect kunit_[err|info|warning]() messages at the same time
>   as we printk() them.  This solves for the most part the sharing
>   of log messages between test execution and debugfs since we
>   just print the suite log (which contains the test suite preamble)
>   and the individual test logs.  The only exception is the suite-level
>   status, which we cannot store in the suite log as it would mean
>   we'd print the suite and its status prior to the suite's results.
>   (Brendan, patch 1)
> - dropped debugfs-based kunit run patch for now so as not to cause
>   problems with tests currently under development (Brendan)
> - fixed doc issues with code block (Brendan, patch 3)
> Changes since v1:
>  - trimmed unneeded include files in lib/kunit/debugfs.c (Greg)
>  - renamed global debugfs functions to be prefixed with kunit_ (Greg)
>  - removed error checking for debugfs operations (Greg)

Everything looks good to me. I tried running kunit_tool and everything
looked good there well.

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