59 static int do_op_one_page(unsigned long addr, int len, int is_write,  in do_op_one_page()  argument
60 		 int (*op)(unsigned long addr, int len, void *arg), void *arg)  in do_op_one_page()
79 		n = (*op)(addr, len, arg);  in do_op_one_page()
90 static int buffer_op(unsigned long addr, int len, int is_write,  in buffer_op()  argument
95 	size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);  in buffer_op()
96 	remain = len;  in buffer_op()
133 static int copy_chunk_from_user(unsigned long from, int len, void *arg)  in copy_chunk_from_user()  argument
137 	memcpy((void *) to, (void *) from, len);  in copy_chunk_from_user()
138 	*to_ptr += len;  in copy_chunk_from_user()
155 static int copy_chunk_to_user(unsigned long to, int len, void *arg)  in copy_chunk_to_user()  argument
159 	memcpy((void *) to, (void *) from, len);  in copy_chunk_to_user()
160 	*from_ptr += len;  in copy_chunk_to_user()
177 static int strncpy_chunk_from_user(unsigned long from, int len, void *arg)  in strncpy_chunk_from_user()  argument
182 	strncpy(to, (void *) from, len);  in strncpy_chunk_from_user()
183 	n = strnlen(to, len);  in strncpy_chunk_from_user()
186 	if (n < len)  in strncpy_chunk_from_user()
212 static int clear_chunk(unsigned long addr, int len, void *unused)  in clear_chunk()  argument
214 	memset((void *) addr, 0, len);  in clear_chunk()
218 int __clear_user(void __user *mem, int len)  in __clear_user()  argument
220 	return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);  in __clear_user()
223 int clear_user(void __user *mem, int len)  in clear_user()  argument
226 		memset((__force void*)mem, 0, len);  in clear_user()
230 	return access_ok(VERIFY_WRITE, mem, len) ?  in clear_user()
231 	       buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len;  in clear_user()
235 static int strnlen_chunk(unsigned long str, int len, void *arg)  in strnlen_chunk()  argument
239 	n = strnlen((void *) str, len);  in strnlen_chunk()
242 	if (n < len)  in strnlen_chunk()
247 int strnlen_user(const void __user *str, int len)  in strnlen_user()  argument
252 		return strnlen((__force char*)str, len) + 1;  in strnlen_user()
254 	n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);  in strnlen_user()