Re: [PATCH 1/2] selftests/lkdtm: Don't clear dmesg when running tests

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:

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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