linux-kernel - Re: objtool warnings in prerelease clang-9

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Date:   Wed, 3 Jul 2019 00:20:22 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kees Cook <keescook@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Craig Topper <craig.topper@...el.com>,
        Alexander Potapenko <glider@...gle.com>,
        Bill Wendling <morbo@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Chandler Carruth <chandlerc@...gle.com>
Subject: Re: objtool warnings in prerelease clang-9

Nick,

On Tue, 2 Jul 2019, Nick Desaulniers wrote:
> On Tue, Jul 2, 2019 at 2:58 PM Thomas Gleixner <tglx@...utronix.de> wrote:
> > On Tue, 2 Jul 2019, Nick Desaulniers wrote:
> 
> > > This causes objtool to not find any issues in
> > > arch/x86/kernel/cpu/mtrr/generic.o.  I don't observe any duplication
> > > in the __jump_table section of the resulting .o file.  It also cuts
> > > down the objtool warnings I observe in a defconfig (listed at the
> > > beginning of the email) from 4 to 2. (platform-quirks.o predates asm
> > > goto,
> >
> > It does not have asm goto inside :)
> 
> I think you're conflating arch/x86/kernel/cpu/mtrr/generic.o with
> arch/x86/kernel/platform-quirks.o.

Nope. I deliberately split the quote after the platform-quirks part so the
reply goes near to it. Seems it wasn't as obvious as I thought :)

Thanks,

	tglx