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

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Date:   Sat, 09 May 2020 12:06:28 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
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

Andy Lutomirski <luto@...nel.org> writes:

> 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?

Yes. A couple of patches which were just handed back and forth between
me and Peter lost them. Fixed them all up localy already.

Thanks,

        tglx