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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Fri, 26 Jun 2020 21:20:22 +0530
Message-ID: <CA+G9fYtdF__9bGneXkuv3E7djg1rbhrQ=DCf6d7_t9hyBZRL2g@mail.gmail.com>
Subject: Re: [PATCH 1/2] selftests/lkdtm: Don't clear dmesg when running tests
To:     Kees Cook <keescook@chromium.org>
Cc:     Michael Ellerman <mpe@ellerman.id.au>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        Anders Roxell <anders.roxell@linaro.org>,
        =?UTF-8?B?RGFuaWVsIETDrWF6?= <daniel.diaz@linaro.org>,
        Justin Cook <justin.cook@linaro.org>,
        lkft-triage@lists.linaro.org, Miroslav Benes <mbenes@suse.cz>,
        Petr Mladek <pmladek@suse.com>, Shuah Khan <shuah@kernel.org>
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On Thu, 25 Jun 2020 at 11:46, Kees Cook <keescook@chromium.org> wrote:
>
> On Mon, Jun 22, 2020 at 02:21:38PM +0530, Naresh Kamboju wrote:
> > On Fri, 8 May 2020 at 12:23, Michael Ellerman <mpe@ellerman.id.au> wrote:
> > >  # Record and dump the results
> > > -dmesg -c >"$LOG"
> > > +dmesg | diff --changed-group-format='%>' --unchanged-group-format='' "$DMESG" - > "$LOG" || true
> >
> > We are facing problems with the diff `=%>` part of the option.
> > This report is from the OpenEmbedded environment.
> > We have the same problem from livepatch_testcases.
>
> Does "comm" exists in those environments?
>
> dmesg | comm -13 "$DMESG" - > "$LOG" || true

"comm" works in our environment.

- Naresh