linux-kernel - Re: [PATCH v2 25/35] nds32: Build infrastructure

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Message-ID: <CAK8P3a1GuH2tgtC5t834-PNeUVYQxreD7seZH8sjraZFtRUWKw@mail.gmail.com>
Date:   Mon, 27 Nov 2017 15:21:19 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Greentime Hu <green.hu@...il.com>
Cc:     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 <deanbo422@...il.com>,
        DTML <devicetree@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-serial@...r.kernel.org, Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v2 25/35] nds32: Build infrastructure

On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu <green.hu@...il.com> wrote:

> diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu
> new file mode 100644
> index 0000000..6b4013f
> --- /dev/null
> +++ b/arch/nds32/Kconfig.cpu
> @@ -0,0 +1,131 @@
> +comment "Processor Features"
> +
> +config CPU_BIG_ENDIAN
> +       bool "Big endian"
> +       def_bool n
> +
> +config CPU_LITTLE_ENDIAN
> +       bool "Little endian"
> +       def_bool y

These must be mutually exclusive, you surely get some build error if you try to
set both here.

You can either make it a 'choice' statement to pick between the two, or you
can make CPU_LITTLE_ENDIAN a silent option like

config CPU_BIG_ENDIAN
       bool "Big endian"

config CPU_LITTLE_ENDIAN
       def_bool !CPU_BIG_ENDIAN

> +config CPU_CACHE_NONALIASING
> +       bool "Non-aliasing cache"
> +       help
> +         If this CPU is using VIPT data cache and its cache way size is larger
> +         than page size, say N. If it is using PIPT data cache, say Y.
> +
> +         If unsure, say Y.

Can you determine this from the CPU type?

> +choice
> +       prompt "Memory split"
> +       depends on MMU
> +       default VMSPLIT_3G
> +       help
> +         Select the desired split between kernel and user memory.
> +
> +         If you are not absolutely sure what you are doing, leave this
> +         option alone!
> +
> +       config VMSPLIT_3G
> +               bool "3G/1G user/kernel split"
> +       config VMSPLIT_3G_OPT
> +               bool "3G/1G user/kernel split (for full 1G low memory)"
> +       config VMSPLIT_2G
> +               bool "2G/2G user/kernel split"
> +       config VMSPLIT_1G
> +               bool "1G/3G user/kernel split"
> +endchoice

I think you mentioned that the 1GB configuration is quite common, how
about making VMSPLIT_3G_OPT the default here?

       Arnd