166 #define __copy_from_user(to, from, n) copy_from_user(to, from, n)  argument
167 #define __copy_to_user(to, from, n) copy_to_user(to, from, n)  argument
171 #define copy_to_user_ret(to, from, n, retval) ({ if (copy_to_user(to, from, n))\  argument
174 #define copy_from_user_ret(to, from, n, retval) ({ if (copy_from_user(to, from, n))\  argument
178 copy_from_user(void *to, const void __user *from, unsigned long n)  in copy_from_user()  argument
180 	if (access_ok(VERIFY_READ, from, n))  in copy_from_user()
181 		memcpy(to, (const void __force *)from, n);  in copy_from_user()
183 		return n;  in copy_from_user()
188 copy_to_user(void __user *to, const void *from, unsigned long n)  in copy_to_user()  argument
190 	if (access_ok(VERIFY_WRITE, to, n))  in copy_to_user()
191 		memcpy((void __force *)to, from, n);  in copy_to_user()
193 		return n;  in copy_to_user()
224 static inline long __must_check strnlen_user(const char __user *src, long n)  in strnlen_user()  argument
228 	return strnlen((const char __force *)src, n) + 1;  in strnlen_user()
243 __clear_user(void __user *to, unsigned long n)  in __clear_user()  argument
245 	if (!access_ok(VERIFY_WRITE, to, n))  in __clear_user()
246 		return n;  in __clear_user()
247 	memset((void __force *)to, 0, n);  in __clear_user()
251 #define clear_user(to, n) __clear_user(to, n)  argument