linux-kernel - Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool

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Message-ID: <20200722200608.40ca9994@oasis.local.home>
Date:   Wed, 22 Jul 2020 20:06:08 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool

On Thu, 23 Jul 2020 01:56:20 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> Anyway, what do you prefer, I suppose I can make objtool whatever we
> need, that patch is trivial. Simply recording the sites and not
> rewriting them should be simple enough.

Either way. If objtool turns it into nops, just make it where we can
enable -DCC_USING_NOP_MCOUNT set, and the kernel will be unaware.

Or if you just add the locations, then that would work too.

-- Steve