linux-kernel - Re: [PATCH v4 3/7] mips: rename macros and files from '64' to 'n64'

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Date:   Mon, 10 Dec 2018 19:51:46 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Firoz Khan <firoz.khan@...aro.org>
CC:     "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        "y2038@...ts.linaro.org" <y2038@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "deepa.kernel@...il.com" <deepa.kernel@...il.com>,
        "marcin.juszkiewicz@...aro.org" <marcin.juszkiewicz@...aro.org>
Subject: Re: [PATCH v4 3/7] mips: rename macros and files from '64' to 'n64'

Hi Firoz,

On Thu, Dec 06, 2018 at 10:48:24AM +0530, Firoz Khan wrote:
> diff --git a/arch/mips/include/uapi/asm/sgidefs.h b/arch/mips/include/uapi/asm/sgidefs.h
> index 26143e3..0364eec 100644
> --- a/arch/mips/include/uapi/asm/sgidefs.h
> +++ b/arch/mips/include/uapi/asm/sgidefs.h
> @@ -40,6 +40,6 @@
>   */
>  #define _MIPS_SIM_ABI32		1
>  #define _MIPS_SIM_NABI32	2
> -#define _MIPS_SIM_ABI64		3
> +#define _MIPS_SIM_ABIN64	3

Whilst I agree with changing our own definitions & filenames to use n64,
this macro actually reflects naming used by the toolchain. ie:

    $ mips-linux-gcc -mips64 -mabi=64 -dM -E - </dev/null | grep ABI64
    #define _ABI64 3
    #define _MIPS_SIM _ABI64

Our macro here is used to compare against _MIPS_SIM provided by the
toolchain, so for consistency I think we should keep the same name for
the macro that the toolchain uses.

And I realise that undoing that but keeping n64 in our own filenames &
macros is another type of inconsistency, but something imperfect is
unavoidable at this point given that the engineers way back when decided
to use "ABI64" for n64.

Thanks,
    Paul