LXR linux/include/asm-generic/getorder.h

   1#ifndef __ASM_GENERIC_GETORDER_H
   2#define __ASM_GENERIC_GETORDER_H
   3
   4#ifndef __ASSEMBLY__
   5
   6#include <linux/compiler.h>
   7
   8/* Pure 2^n version of get_order */
   9static inline __attribute_const__ int get_order(unsigned long size)
  10{
  11        int order;
  12
  13        size = (size - 1) >> (PAGE_SHIFT - 1);
  14        order = -1;
  15        do {
  16                size >>= 1;
  17                order++;
  18        } while (size);
  19        return order;
  20}
  21
  22#endif  /* __ASSEMBLY__ */
  23
  24#endif  /* __ASM_GENERIC_GETORDER_H */
  25