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- #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
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