netdev - Re: [PATCH 26/31] nds32: Build infrastructure

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Message-ID: <CAK8P3a3DBbCeqvQeS4sdG8tzAvvgk72EDA7oDfeQDL1-7bnzkg@mail.gmail.com>
Date:   Thu, 16 Nov 2017 11:25:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Greentime Hu <green.hu@...il.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime <greentime@...estech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH 26/31] nds32: Build infrastructure

On Thu, Nov 16, 2017 at 11:03 AM, Greentime Hu <green.hu@...il.com> wrote:
> 2017-11-13 18:45 GMT+08:00 Geert Uytterhoeven <geert@...ux-m68k.org>:
>> Given the checks for __NDS32_EB__, NDS32 can be either big or little endian,
>> so you should have (excatly one of) CPU_BIG_ENDIAN or CPU_LITTLE_ENDIAN set.
>
> Thanks.
> I will check if we need this config or not and update in the next version patch.

I think we have one architecture in the kernel that determines endianess from
the way that the toolchain is built. What all the others do it to have a Kconfig
option, at least CONFIG_CPU_BIG_ENDIAN that is used to pass -mbig-endian
or -mlittle-endian to the compiler. You should do it that way so you can use
any toolchain with any kernel configuration.

       Arnd