/include/asm-generic/getorder.h

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t · C Header · 24 lines · 17 code · 6 blank · 1 comment · 1 complexity · 388765f460d789656c2cf21b86af4200 MD5 · raw file 

    

  1. #ifndef __ASM_GENERIC_GETORDER_H
    2. 

  2. #define __ASM_GENERIC_GETORDER_H
    3. 

  3. 

  4. #ifndef __ASSEMBLY__
    5. 

  5. 

  6. #include <linux/compiler.h>
    7. 

  7. 

  8. /* Pure 2^n version of get_order */
    9. 

  9. static inline __attribute_const__ int get_order(unsigned long size)
    10. 

  10. {
    11. 

  11. 	int order;
    12. 

  12. 

  13. 	size = (size - 1) >> (PAGE_SHIFT - 1);
    14. 

  14. 	order = -1;
    15. 

  15. 	do {
    16. 

  16. 		size >>= 1;
    17. 

  17. 		order++;
    18. 

  18. 	} while (size);
    19. 

  19. 	return order;
    20. 

  20. }
    21. 

  21. 

  22. #endif	/* __ASSEMBLY__ */
    23. 

  23. 

  24. #endif	/* __ASM_GENERIC_GETORDER_H */
    25.