__copy_user_flushcache
extern unsigned long __must_check __copy_user_flushcache(void *to, const void __user *from, unsigned long n);
return __copy_user_flushcache(dst, __uaccess_mask_ptr(src), size);
extern long __copy_user_flushcache(void *dst, const void __user *src, unsigned size);
return __copy_user_flushcache(dst, src, size);