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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