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- #ifndef _LINUX_MATH64_H
- #define _LINUX_MATH64_H
- #include <linux/types.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 s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
- {
- *remainder = dividend % divisor;
- return dividend / divisor;
- }
- /**
- * div64_u64 - unsigned 64bit divide with 64bit divisor
- */
- static inline u64 div64_u64(u64 dividend, u64 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
- #ifndef div64_u64
- extern u64 div64_u64(u64 dividend, u64 divisor);
- #endif
- #endif /* BITS_PER_LONG */
- /**
- * div_u64 - unsigned 64bit divide with 32bit divisor
- *
- * This is the most common 64bit divide and should be used if possible,
- * as many 32bit archs can optimize this variant better than a full 64bit
- * divide.
- */
- #ifndef div_u64
- static inline u64 div_u64(u64 dividend, u32 divisor)
- {
- u32 remainder;
- return div_u64_rem(dividend, divisor, &remainder);
- }
- #endif
- /**
- * div_s64 - signed 64bit divide with 32bit divisor
- */
- #ifndef div_s64
- static inline s64 div_s64(s64 dividend, s32 divisor)
- {
- s32 remainder;
- return div_s64_rem(dividend, divisor, &remainder);
- }
- #endif
- u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
- #endif /* _LINUX_MATH64_H */
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