linux-kernel - Re: [PATCH, RFC] byteorder: sanity check toolchain vs kernel endianess

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Date:   Thu, 30 May 2019 01:46:18 +0000
From:   Maciej Rozycki <macro@....com>
To:     Christoph Hellwig <hch@....de>
CC:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "mick@....forth.gr" <mick@....forth.gr>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, RFC] byteorder: sanity check toolchain vs kernel
 endianess

On Fri, 12 Apr 2019, Christoph Hellwig wrote:

> diff --git a/include/uapi/linux/byteorder/big_endian.h b/include/uapi/linux/byteorder/big_endian.h
> index 2199adc6a6c2..34a5864526d2 100644
> --- a/include/uapi/linux/byteorder/big_endian.h
> +++ b/include/uapi/linux/byteorder/big_endian.h
> @@ -2,6 +2,10 @@
>  #ifndef _UAPI_LINUX_BYTEORDER_BIG_ENDIAN_H
>  #define _UAPI_LINUX_BYTEORDER_BIG_ENDIAN_H
>  
> +#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
> +#error "Unsupported endianess, check your toolchain"

 Typo here: s/endianess/endianness/.

> diff --git a/include/uapi/linux/byteorder/little_endian.h b/include/uapi/linux/byteorder/little_endian.h
> index 601c904fd5cd..0cdf3583e19f 100644
> --- a/include/uapi/linux/byteorder/little_endian.h
> +++ b/include/uapi/linux/byteorder/little_endian.h
> @@ -2,6 +2,10 @@
>  #ifndef _UAPI_LINUX_BYTEORDER_LITTLE_ENDIAN_H
>  #define _UAPI_LINUX_BYTEORDER_LITTLE_ENDIAN_H
>  
> +#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ !=  __ORDER_LITTLE_ENDIAN__
> +#error "Unsupported endianess, check your toolchain"

 Likewise.

  Maciej