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 */
   9 static 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 */