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

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Message-ID: <CAMuHMdXTNQZSX71E4ds2OeR-5pPKmARqtP0BQbaWzKhpvieC7w@mail.gmail.com>
Date:   Mon, 13 Nov 2017 11:45:07 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greentime Hu <green.hu@...il.com>, 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 Wed, Nov 8, 2017 at 11:16 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu <green.hu@...il.com> wrote:
>> --- /dev/null
>> +++ b/arch/nds32/Kconfig
>> @@ -0,0 +1,107 @@
>> +#
>> +# For a description of the syntax of this configuration file,
>> +# see Documentation/kbuild/kconfig-language.txt.
>> +#
>> +
>> +config NDS32
>> +        def_bool y
>> +       select ARCH_HAS_RAW_COPY_USER
>> +       select ARCH_WANT_FRAME_POINTERS if FTRACE
>> +       select ARCH_WANT_IPC_PARSE_VERSION
>> +       select CLKSRC_MMIO
>> +       select CLONE_BACKWARDS
>> +       select TIMER_OF
>> +       select FRAME_POINTER
>> +       select GENERIC_ATOMIC64
>> +       select GENERIC_CPU_DEVICES
>> +       select GENERIC_CLOCKEVENTS
>> +       select GENERIC_IOMAP
>> +       select GENERIC_IRQ_CHIP
>> +       select GENERIC_IRQ_PROBE
>> +       select GENERIC_IRQ_SHOW
>> +       select GENERIC_STRNCPY_FROM_USER
>> +       select GENERIC_STRNLEN_USER
>> +       select GENERIC_TIME_VSYSCALL
>> +       select HAVE_ARCH_TRACEHOOK
>> +       select HAVE_GENERIC_IOMAP
>
> You normally don't want HAVE_GENERIC_IOMAP, at least unless the CPU
> has special instructions to trigger PCI I/O port access.

GENERIC_IOMAP or HAVE_GENERIC_IOMAP?

The latter doesn't even exist, except in
Documentation/kbuild/kconfig-language.txt, so it cannot be selected.

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.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds