linux-kernel - Re: [patch V4 part 2 12/18] x86,objtool: Make entry_64

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Date:   Fri, 8 May 2020 17:11:47 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V4 part 2 12/18] x86,objtool: Make entry_64_compat.S
 objtool clean

On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Currently entry_64_compat is exempt from objtool, but with vmlinux
> mode there is no hiding it.
>
> Make the following changes to make it pass:
>
>  - change entry_SYSENTER_compat to STT_NOTYPE; it's not a function
>    and doesn't have function type stack setup.
>
>  - mark all STT_NOTYPE symbols with UNWIND_HINT_EMPTY; so we do
>    validate them and don't treat them as unreachable.
>
>  - don't abuse RSP as a temp register, this confuses objtool
>    mightily as it (rightfully) thinks we're doing unspeakable
>    things to the stack.
>

Acked-by: Andy Lutomirski <luto@...nel.org>

> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Did a From line get eaten?