linux-kernel - Re: objtool warning "uses BP as a scratch register" with clang-9

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Message-ID: <CAK8P3a1gkA4cqbKbLLCAukiX-0tA9fV_FTG6PLTfv+DSHp44GQ@mail.gmail.com>
Date:   Wed, 28 Aug 2019 17:29:39 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Ilie Halip <ilie.halip@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: objtool warning "uses BP as a scratch register" with clang-9

On Wed, Aug 28, 2019 at 4:51 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> On Wed, Aug 28, 2019 at 11:00:04AM +0200, Arnd Bergmann wrote:
> > On Tue, Aug 27, 2019 at 11:22 PM 'Nick Desaulniers' via Clang Built
> > Linux <clang-built-linux@...glegroups.com> wrote:
> > > On Tue, Aug 27, 2019 at 12:47 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > Only a few unique objtool warnings remain now, here are the ones I
> > currently see,
> > along with .config files. Let me know which ones I should investigate further,
> > I assume a lot of these are known issues:
>
> None of those look necessarily familiar.  What are the remaining "known"
> clang issues which were found by objtool?

Maybe Nick can identify some.

> If you share .o files I can look at them.

Attaching the ones I could easily recreate here.

       Arnd

Download attachment "objtool-warnings.tar.gz" of type "application/gzip" (217870 bytes)