linux-kernel - Re: [PATCH 3/3] arm64: configs: unset CPU_BIG

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Message-ID: <CAK8P3a1C8cFB6DS9eVXTEiTQu1kPzy65JvL=BxqEe5MTkds8sQ@mail.gmail.com>
Date:   Sat, 12 Oct 2019 16:05:57 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Hanjun Guo <guohanjun@...wei.com>
Cc:     Will Deacon <will@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        John Garry <john.garry@...wei.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/3] arm64: configs: unset CPU_BIG_ENDIAN

On Sat, Oct 12, 2019 at 9:33 AM Hanjun Guo <guohanjun@...wei.com> wrote:
>
> On 2019/10/11 18:27, Will Deacon wrote:
> [...]
> >
> > Does anybody use BIG_ENDIAN? If we're not even building it then maybe we
> > should get rid of it altogether on arm64. I don't know of any supported
> > userspace that supports it or any CPUs that are unable to run little-endian
> > binaries.
>
> FWIW, massive telecommunication products (based on ARM64) form Huawei are using
> BIG_ENDIAN, and will use BIG_ENDIAN in the near future as well.

Ok, thanks for the information -- that definitely makes it clear that
it cannot go
away anytime soon (though it doesn't stop us from change the
allmodconfig default
if we decide that's a good idea).

Do you know if there are currently any patches against mainline to
make big-endian
work in products, or is everything working out of the box?

     Arnd