linux-kernel - Re: [PATCH -tip] kcov: Make runtime functions noinstr-compatible

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Message-ID: <20200604205219.GZ2483@worktop.programming.kicks-ass.net>
Date:   Thu, 4 Jun 2020 22:52:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] kcov: Make runtime functions noinstr-compatible

On Thu, Jun 04, 2020 at 04:23:38PM +0200, Marco Elver wrote:
> Sadly no. 'noinstr' implies 'notrace', but also places the function in
> the .noinstr.text section for the purpose of objtool checking.

Not only the compile time checking, but also for purpose of runtime
exclusion for things like kprobes and hw-breakpoints.