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Date: Wed, 22 Jul 2020 13:58:36 -0400
From: Steven Rostedt <>
To: Sami Tolvanen <>
Cc: Peter Zijlstra <>, Masahiro Yamada
 <>, Will Deacon <>, Greg Kroah-Hartman
 <>, "Paul E. McKenney" <>, Kees
 Cook <>, Nick Desaulniers <>,
 clang-built-linux <>, Kernel Hardening
 <>, linux-arch
 <>, linux-arm-kernel
 <>, linux-kbuild
 <>, LKML <>,, X86 ML <>, Josh Poimboeuf
Subject: Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool

On Mon, 20 Jul 2020 09:52:37 -0700
Sami Tolvanen <> 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.


-- Steve

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