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Message-ID: <20200722135829.7ca6fbc5@oasis.local.home>
Date: Wed, 22 Jul 2020 13:58:36 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, 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 <clang-built-linux@...glegroups.com>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>, linux-arch
<linux-arch@...r.kernel.org>, linux-arm-kernel
<linux-arm-kernel@...ts.infradead.org>, linux-kbuild
<linux-kbuild@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
linux-pci@...r.kernel.org, X86 ML <x86@...nel.org>, Josh Poimboeuf
<jpoimboe@...hat.com>
Subject: Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool
On Mon, 20 Jul 2020 09:52:37 -0700
Sami Tolvanen <samitolvanen@...gle.com> wrote:
> > Does x86 have a way to differentiate between the two that record mcount
> > can check?
>
> I'm not sure if looking at the relocation alone is sufficient on x86,
> we might also have to decode the instruction, which is what objtool
> does. Did you have any thoughts on Peter's patch, or my initial
> suggestion, which adds a __nomcount attribute to affected functions?
There's a lot of code in this thread. Can you give me the message-id of
Peter's patch in question.
Thanks,
-- Steve
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