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From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Mon, 29 Jul 2019 13:45:35 -0700
Message-ID: <CAKwvOdm7GRBWYhPy4Ni2jbsXJp8gDF-AqaAxeLbZ03+LvHxADQ@mail.gmail.com>
Subject: Re: [PATCH] powerpc: workaround clang codegen bug in dcbz
To:     Nathan Chancellor <natechancellor@gmail.com>
Cc:     Michael Ellerman <mpe@ellerman.id.au>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Segher Boessenkool <segher@kernel.crashing.org>,
        Arnd Bergmann <arnd@arndb.de>,
        kbuild test robot <lkp@intel.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        linuxppc-dev@lists.ozlabs.org, LKML <linux-kernel@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>
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On Mon, Jul 29, 2019 at 1:32 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> On Mon, Jul 29, 2019 at 01:25:41PM -0700, Nick Desaulniers wrote:
> > But I'm not sure how the inlined code generated would be affected.
>
> For the record:
>
> https://godbolt.org/z/z57VU7
>
> This seems consistent with what Michael found so I don't think a revert
> is entirely unreasonable.

Thanks for debugging/reporting/testing and the Godbolt link which
clearly shows that the codegen for out of line versions is no
different.  The case I can't comment on is what happens when those
`static inline` functions get inlined (maybe the original patch
improves those cases?).
-- 
Thanks,
~Nick Desaulniers