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-rw-r--r--include/linux/math64.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/math64.h b/include/linux/math64.h
index 177785e1e4a3..c87f1528703a 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -83,4 +83,23 @@ static inline s64 div_s64(s64 dividend, s32 divisor)
83 83
84u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder); 84u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
85 85
86static __always_inline u32
87__iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
88{
89 u32 ret = 0;
90
91 while (dividend >= divisor) {
92 /* The following asm() prevents the compiler from
93 optimising this loop into a modulo operation. */
94 asm("" : "+rm"(dividend));
95
96 dividend -= divisor;
97 ret++;
98 }
99
100 *remainder = dividend;
101
102 return ret;
103}
104
86#endif /* _LINUX_MATH64_H */ 105#endif /* _LINUX_MATH64_H */