239 …rn unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
240 extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n…
241 …signed long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
242 extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
244 …nline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)  in copy_from_user()  argument
246 	if (access_ok(VERIFY_READ, from, n))  in copy_from_user()
247 		n = __copy_from_user(to, from, n);  in copy_from_user()
249 		memset(to, 0, n);  in copy_from_user()
250 	return n;  in copy_from_user()
253 … inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)  in copy_to_user()  argument
255 	if (access_ok(VERIFY_WRITE, to, n))  in copy_to_user()
256 		n = __copy_to_user(to, from, n);  in copy_to_user()
257 	return n;  in copy_to_user()
260 … unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n)  in copy_in_user()  argument
262 	if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))  in copy_in_user()
263 		n = __copy_in_user(to, from, n);  in copy_in_user()
264 	return n;  in copy_in_user()
270 static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)  in clear_user()  argument
272 	if (access_ok(VERIFY_WRITE, to, n))  in clear_user()
273 		n = __clear_user(to, n);  in clear_user()
274 	return n;  in clear_user()
280 extern __must_check long strnlen_user(const char __user *str, long n);