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-rw-r--r--lib/div64.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/lib/div64.c b/lib/div64.c
index c3d7655cdfb5..74f0c8cb4031 100644
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -61,20 +61,18 @@ EXPORT_SYMBOL(__div64_32);
61/* 64bit divisor, dividend and result. dynamic precision */ 61/* 64bit divisor, dividend and result. dynamic precision */
62uint64_t div64_64(uint64_t dividend, uint64_t divisor) 62uint64_t div64_64(uint64_t dividend, uint64_t divisor)
63{ 63{
64 uint32_t d = divisor; 64 uint32_t high, d;
65 65
66 if (divisor > 0xffffffffULL) { 66 high = divisor >> 32;
67 unsigned int shift = fls(divisor >> 32); 67 if (high) {
68 unsigned int shift = fls(high);
68 69
69 d = divisor >> shift; 70 d = divisor >> shift;
70 dividend >>= shift; 71 dividend >>= shift;
71 } 72 } else
73 d = divisor;
72 74
73 /* avoid 64 bit division if possible */ 75 do_div(dividend, d);
74 if (dividend >> 32)
75 do_div(dividend, d);
76 else
77 dividend = (uint32_t) dividend / d;
78 76
79 return dividend; 77 return dividend;
80} 78}