From 5cca7619a562c9d98a3a0123dc878d79bf3c8fb3 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 9 Jan 2006 20:52:20 -0800 Subject: [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 Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/calc64.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 include/linux/calc64.h (limited to 'include/linux/calc64.h') diff --git a/include/linux/calc64.h b/include/linux/calc64.h new file mode 100644 index 00000000000..ebf4b8f38d8 --- /dev/null +++ b/include/linux/calc64.h @@ -0,0 +1,49 @@ +#ifndef _LINUX_CALC64_H +#define _LINUX_CALC64_H + +#include +#include + +/* + * 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 -- cgit v1.2.3