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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 12 May 2021 12:04:08 -0700
Message-ID: <CAHk-=wj8jOJtKpw-Jsd043sjdL=rPnOD8uD8Tf84_Q36iu_ewQ@mail.gmail.com>
Subject: Re: [PATCH 5.12 000/677] 5.12.4-rc1 review
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        open list <linux-kernel@vger.kernel.org>,
        Shuah Khan <shuah@kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>, patches@kernelci.org,
        lkft-triage@lists.linaro.org, Jon Hunter <jonathanh@nvidia.com>,
        linux-stable <stable@vger.kernel.org>,
        Pavel Machek <pavel@denx.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        "Maciej W. Rozycki" <macro@orcam.me.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Huacai Chen <chenhuacai@kernel.org>
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On Wed, May 12, 2021 at 11:48 AM Naresh Kamboju
<naresh.kamboju@linaro.org> wrote:
>
> Linus's tree builds MIPS clang successfully.

Note that this might just be a random effect of inlining or other
register allocation pressure details.

So it's possible that upstream builds mostly by luck.

The "couldn't allocate output register" thing really does seem more
like a compiler issue than a kernel source code issue.

             Linus