linux-kernel - [RFC][PATCH 0/3] objtool: KCOV vs noinstr

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Date:   Fri, 12 Jun 2020 16:30:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, dvyukov@...gle.com,
        elver@...gle.com, andreyknvl@...gle.com, mark.rutland@....com,
        mhelsley@...are.com, rostedt@...dmis.org, jthierry@...hat.com,
        mbenes@...e.cz, peterz@...radead.org
Subject: [RFC][PATCH 0/3] objtool: KCOV vs noinstr

Hi All,

These patches go on top of objtool/core, although possibly we need them earlier.

In order to solve the KCOV-vs-noinstr situation, we need objtool to rewrite
calls to __sanitizer_cov_*() into NOPs, similar to what recordmcount does.

I'm hoping the pending objtool-recordmcount patches can also reuse some of this.