linux-kernel - Re: [PATCH 2/3 v2] sh: define __BIG

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Date:   Wed, 30 Jun 2021 11:35:09 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH 2/3 v2] sh: define __BIG_ENDIAN for math-emu

On 6/28/21 12:05 AM, Randy Dunlap wrote:
> Fix this by defining both ENDIAN macros in
> <asm/sfp-machine.h> so that they can be utilized in
> <math-emu/soft-fp.h> according to the latter's comment:
> /* Allow sfp-machine to have its own byte order definitions. */
> 
> (This is what is done in arch/nds32/include/asm/sfp-machine.h.)
> 
> This placates these build warnings:
> 
> In file included from ../arch/sh/math-emu/math.c:23:
> ../include/math-emu/single.h:50:21: warning: "__BIG_ENDIAN" is not defined, evaluates to 0 [-Wundef]
>    50 | #if __BYTE_ORDER == __BIG_ENDIAN
> In file included from ../arch/sh/math-emu/math.c:24:
> ../include/math-emu/double.h:59:21: warning: "__BIG_ENDIAN" is not defined, evaluates to 0 [-Wundef]
>    59 | #if __BYTE_ORDER == __BIG_ENDIAN
> 
> Fixes: 4b565680d163 ("sh: math-emu support")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: linux-sh@...r.kernel.org
> Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2: use same preprocessor method that nds32 does;
>     add Geert's Reviewed-by;
>     renumber patches;
>     add more Cc's;
> 
>  arch/sh/include/asm/sfp-machine.h |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> --- linux-next-20210625.orig/arch/sh/include/asm/sfp-machine.h
> +++ linux-next-20210625/arch/sh/include/asm/sfp-machine.h
> @@ -13,6 +13,14 @@
>  #ifndef _SFP_MACHINE_H
>  #define _SFP_MACHINE_H
>  
> +#ifdef __BIG_ENDIAN__
> +#define __BYTE_ORDER __BIG_ENDIAN
> +#define __LITTLE_ENDIAN 0
> +#else
> +#define __BYTE_ORDER __LITTLE_ENDIAN
> +#define __BIG_ENDIAN 0
> +#endif
> +
>  #define _FP_W_TYPE_SIZE		32
>  #define _FP_W_TYPE		unsigned long
>  #define _FP_WS_TYPE		signed long
> 

Boot-tested on my SH-7785LCR without any issues.

Tested-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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