Branch data     Line data    Source code

       1                 :            : #include <linux/kernel.h>
       2                 :            : #include <asm/div64.h>
       3                 :            : #include <linux/reciprocal_div.h>
       4                 :            : #include <linux/export.h>
       5                 :            : 
       6                 :            : /*
       7                 :            :  * For a description of the algorithm please have a look at
       8                 :            :  * include/linux/reciprocal_div.h
       9                 :            :  */
      10                 :            : 
      11                 :          0 : struct reciprocal_value reciprocal_value(u32 d)
      12                 :            : {
      13                 :            :         struct reciprocal_value R;
      14                 :            :         u64 m;
      15                 :            :         int l;
      16                 :            : 
      17                 :          0 :         l = fls(d - 1);
      18                 :          0 :         m = ((1ULL << 32) * ((1ULL << l) - d));
      19 [ #  # ][ #  # ]:          0 :         do_div(m, d);
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      20                 :          0 :         ++m;
      21                 :          0 :         R.m = (u32)m;
      22                 :          0 :         R.sh1 = min(l, 1);
      23                 :          0 :         R.sh2 = max(l - 1, 0);
      24                 :            : 
      25                 :          0 :         return R;
      26                 :            : }
      27                 :            : EXPORT_SYMBOL(reciprocal_value);