kernel-ark/include/linux/calc64.h
Thomas Gleixner 5cca7619a5 [PATCH] hrtimer: move div_long_long_rem out of jiffies.h
move div_long_long_rem() from jiffies.h into a new calc64.h include file, as
it is a general math function useful for other things than the jiffy code.
Convert it to an inline function

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:35 -08:00

50 lines
1.3 KiB
C

#ifndef _LINUX_CALC64_H
#define _LINUX_CALC64_H
#include <linux/types.h>
#include <asm/div64.h>
/*
* This is a generic macro which is used when the architecture
* specific div64.h does not provide a optimized one.
*
* The 64bit dividend is divided by the divisor (data type long), the
* result is returned and the remainder stored in the variable
* referenced by remainder (data type long *). In contrast to the
* do_div macro the dividend is kept intact.
*/
#ifndef div_long_long_rem
#define div_long_long_rem(dividend, divisor, remainder) \
do_div_llr((dividend), divisor, remainder)
static inline unsigned long do_div_llr(const long long dividend,
const long divisor, long *remainder)
{
u64 result = dividend;
*(remainder) = do_div(result, divisor);
return (unsigned long) result;
}
#endif
/*
* Sign aware variation of the above. On some architectures a
* negative dividend leads to an divide overflow exception, which
* is avoided by the sign check.
*/
static inline long div_long_long_rem_signed(const long long dividend,
const long divisor, long *remainder)
{
long res;
if (unlikely(dividend < 0)) {
res = -div_long_long_rem(-dividend, divisor, remainder);
*remainder = -(*remainder);
} else
res = div_long_long_rem(dividend, divisor, remainder);
return res;
}
#endif