linux-kernel - Re: [PATCH 1/4] introduce explicit signed/unsigned 64bit divide

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Date:	Thu, 13 Mar 2008 11:13:31 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	zippel@...ux-m68k.org
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/4] introduce explicit signed/unsigned 64bit divide

On Thu, 13 Mar 2008, zippel@...ux-m68k.org wrote:
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/linux/math64.h	2008-03-12 21:21:26.000000000 +0100
> @@ -0,0 +1,72 @@
> +#ifndef _LINUX_MATH64_H
> +#define _LINUX_MATH64_H
> +
> +#include <linux/types.h>
> +#include <asm/div64.h>
> +
> +#if BITS_PER_LONG == 64
> +
> +/**
> + * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
> + *
> + * This is commonly provided by 32bit archs to provide an optimized 64bit
> + * divide.
> + */
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
> +{
> +	*remainder = dividend % divisor;
> +	return dividend / divisor;
> +}
> +
> +/**
> + * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
> + */
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
                 ^       ^       ^             ^            ^
		 s64 div_s64_rem s64           s32          s32
> +{
> +	*remainder = dividend % divisor;
> +	return dividend / divisor;
> +}
> +
> +#elif BITS_PER_LONG == 32
> +
> +#ifndef div_u64_rem
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
> +{
> +	*remainder = do_div(dividend, divisor);
> +	return dividend;
> +}
> +#endif
> +
> +#ifndef div_s64_rem
> +extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
> +#endif

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

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