release/src-rt-6.x.4708/linux/linux-2.6.36/include/asm-generic/uaccess-unaligned.h

   1 #ifndef __ASM_GENERIC_UACCESS_UNALIGNED_H
   2 #define __ASM_GENERIC_UACCESS_UNALIGNED_H
   3
   4 /*
   5  * This macro should be used instead of __get_user() when accessing
   6  * values at locations that are not known to be aligned.
   7  */
   8 #define __get_user_unaligned(x, ptr)                                    \
   9 ({                                                                      \
  10         __typeof__ (*(ptr)) __x;                                        \
  11         __copy_from_user(&__x, (ptr), sizeof(*(ptr))) ? -EFAULT : 0;    \
  12         (x) = __x;                                                      \
  13 })
  14
  15
  16 /*
  17  * This macro should be used instead of __put_user() when accessing
  18  * values at locations that are not known to be aligned.
  19  */
  20 #define __put_user_unaligned(x, ptr)                                    \
  21 ({                                                                      \
  22         __typeof__ (*(ptr)) __x = (x);                                  \
  23         __copy_to_user((ptr), &__x, sizeof(*(ptr))) ? -EFAULT : 0;      \
  24 })
  25
  26 #endif /* __ASM_GENERIC_UACCESS_UNALIGNED_H */