1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_MODULE_PARAMS_H 3 #define _LINUX_MODULE_PARAMS_H 4 /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */ 5 #include <linux/init.h> 6 #include <linux/stringify.h> 7 #include <linux/kernel.h> 8 9 /* You can override this manually, but generally this should match the 10 module name. */ 11 #ifdef MODULE 12 #define MODULE_PARAM_PREFIX /* empty */ 13 #define __MODULE_INFO_PREFIX /* empty */ 14 #else 15 #define MODULE_PARAM_PREFIX KBUILD_MODNAME "." 16 /* We cannot use MODULE_PARAM_PREFIX because some modules override it. */ 17 #define __MODULE_INFO_PREFIX KBUILD_MODNAME "." 18 #endif 19 20 /* Chosen so that structs with an unsigned long line up. */ 21 #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long)) 22 23 #define __MODULE_INFO(tag, name, info) \ 24 static const char __UNIQUE_ID(name)[] \ 25 __used __section(".modinfo") __aligned(1) \ 26 = __MODULE_INFO_PREFIX __stringify(tag) "=" info 27 28 #define __MODULE_PARM_TYPE(name, _type) \ 29 __MODULE_INFO(parmtype, name##type, #name ":" _type) 30 31 /* One for each parameter, describing how to use it. Some files do 32 multiple of these per line, so can't just use MODULE_INFO. */ 33 #define MODULE_PARM_DESC(_parm, desc) \ 34 __MODULE_INFO(parm, _parm, #_parm ":" desc) 35 36 struct kernel_param; 37 38 /* 39 * Flags available for kernel_param_ops 40 * 41 * NOARG - the parameter allows for no argument (foo instead of foo=1) 42 */ 43 enum { 44 KERNEL_PARAM_OPS_FL_NOARG = (1 << 0) 45 }; 46 47 struct kernel_param_ops { 48 /* How the ops should behave */ 49 unsigned int flags; 50 /* Returns 0, or -errno. arg is in kp->arg. */ 51 int (*set)(const char *val, const struct kernel_param *kp); 52 /* Returns length written or -errno. Buffer is 4k (ie. be short!) */ 53 int (*get)(char *buffer, const struct kernel_param *kp); 54 /* Optional function to free kp->arg when module unloaded. */ 55 void (*free)(void *arg); 56 }; 57 58 /* 59 * Flags available for kernel_param 60 * 61 * UNSAFE - the parameter is dangerous and setting it will taint the kernel 62 * HWPARAM - Hardware param not permitted in lockdown mode 63 */ 64 enum { 65 KERNEL_PARAM_FL_UNSAFE = (1 << 0), 66 KERNEL_PARAM_FL_HWPARAM = (1 << 1), 67 }; 68 69 struct kernel_param { 70 const char *name; 71 struct module *mod; 72 const struct kernel_param_ops *ops; 73 const u16 perm; 74 s8 level; 75 u8 flags; 76 union { 77 void *arg; 78 const struct kparam_string *str; 79 const struct kparam_array *arr; 80 }; 81 }; 82 83 extern const struct kernel_param __start___param[], __stop___param[]; 84 85 /* Special one for strings we want to copy into */ 86 struct kparam_string { 87 unsigned int maxlen; 88 char *string; 89 }; 90 91 /* Special one for arrays */ 92 struct kparam_array 93 { 94 unsigned int max; 95 unsigned int elemsize; 96 unsigned int *num; 97 const struct kernel_param_ops *ops; 98 void *elem; 99 }; 100 101 /** 102 * module_param - typesafe helper for a module/cmdline parameter 103 * @name: the variable to alter, and exposed parameter name. 104 * @type: the type of the parameter 105 * @perm: visibility in sysfs. 106 * 107 * @name becomes the module parameter, or (prefixed by KBUILD_MODNAME and a 108 * ".") the kernel commandline parameter. Note that - is changed to _, so 109 * the user can use "foo-bar=1" even for variable "foo_bar". 110 * 111 * @perm is 0 if the variable is not to appear in sysfs, or 0444 112 * for world-readable, 0644 for root-writable, etc. Note that if it 113 * is writable, you may need to use kernel_param_lock() around 114 * accesses (esp. charp, which can be kfreed when it changes). 115 * 116 * The @type is simply pasted to refer to a param_ops_##type and a 117 * param_check_##type: for convenience many standard types are provided but 118 * you can create your own by defining those variables. 119 * 120 * Standard types are: 121 * byte, hexint, short, ushort, int, uint, long, ulong 122 * charp: a character pointer 123 * bool: a bool, values 0/1, y/n, Y/N. 124 * invbool: the above, only sense-reversed (N = true). 125 */ 126 #define module_param(name, type, perm) \ 127 module_param_named(name, name, type, perm) 128 129 /** 130 * module_param_unsafe - same as module_param but taints kernel 131 * @name: the variable to alter, and exposed parameter name. 132 * @type: the type of the parameter 133 * @perm: visibility in sysfs. 134 */ 135 #define module_param_unsafe(name, type, perm) \ 136 module_param_named_unsafe(name, name, type, perm) 137 138 /** 139 * module_param_named - typesafe helper for a renamed module/cmdline parameter 140 * @name: a valid C identifier which is the parameter name. 141 * @value: the actual lvalue to alter. 142 * @type: the type of the parameter 143 * @perm: visibility in sysfs. 144 * 145 * Usually it's a good idea to have variable names and user-exposed names the 146 * same, but that's harder if the variable must be non-static or is inside a 147 * structure. This allows exposure under a different name. 148 */ 149 #define module_param_named(name, value, type, perm) \ 150 param_check_##type(name, &(value)); \ 151 module_param_cb(name, ¶m_ops_##type, &value, perm); \ 152 __MODULE_PARM_TYPE(name, #type) 153 154 /** 155 * module_param_named_unsafe - same as module_param_named but taints kernel 156 * @name: a valid C identifier which is the parameter name. 157 * @value: the actual lvalue to alter. 158 * @type: the type of the parameter 159 * @perm: visibility in sysfs. 160 */ 161 #define module_param_named_unsafe(name, value, type, perm) \ 162 param_check_##type(name, &(value)); \ 163 module_param_cb_unsafe(name, ¶m_ops_##type, &value, perm); \ 164 __MODULE_PARM_TYPE(name, #type) 165 166 /** 167 * module_param_cb - general callback for a module/cmdline parameter 168 * @name: a valid C identifier which is the parameter name. 169 * @ops: the set & get operations for this parameter. 170 * @arg: args for @ops 171 * @perm: visibility in sysfs. 172 * 173 * The ops can have NULL set or get functions. 174 */ 175 #define module_param_cb(name, ops, arg, perm) \ 176 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0) 177 178 #define module_param_cb_unsafe(name, ops, arg, perm) \ 179 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \ 180 KERNEL_PARAM_FL_UNSAFE) 181 182 #define __level_param_cb(name, ops, arg, perm, level) \ 183 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0) 184 /** 185 * core_param_cb - general callback for a module/cmdline parameter 186 * to be evaluated before core initcall level 187 * @name: a valid C identifier which is the parameter name. 188 * @ops: the set & get operations for this parameter. 189 * @arg: args for @ops 190 * @perm: visibility in sysfs. 191 * 192 * The ops can have NULL set or get functions. 193 */ 194 #define core_param_cb(name, ops, arg, perm) \ 195 __level_param_cb(name, ops, arg, perm, 1) 196 197 /** 198 * postcore_param_cb - general callback for a module/cmdline parameter 199 * to be evaluated before postcore initcall level 200 * @name: a valid C identifier which is the parameter name. 201 * @ops: the set & get operations for this parameter. 202 * @arg: args for @ops 203 * @perm: visibility in sysfs. 204 * 205 * The ops can have NULL set or get functions. 206 */ 207 #define postcore_param_cb(name, ops, arg, perm) \ 208 __level_param_cb(name, ops, arg, perm, 2) 209 210 /** 211 * arch_param_cb - general callback for a module/cmdline parameter 212 * to be evaluated before arch initcall level 213 * @name: a valid C identifier which is the parameter name. 214 * @ops: the set & get operations for this parameter. 215 * @arg: args for @ops 216 * @perm: visibility in sysfs. 217 * 218 * The ops can have NULL set or get functions. 219 */ 220 #define arch_param_cb(name, ops, arg, perm) \ 221 __level_param_cb(name, ops, arg, perm, 3) 222 223 /** 224 * subsys_param_cb - general callback for a module/cmdline parameter 225 * to be evaluated before subsys initcall level 226 * @name: a valid C identifier which is the parameter name. 227 * @ops: the set & get operations for this parameter. 228 * @arg: args for @ops 229 * @perm: visibility in sysfs. 230 * 231 * The ops can have NULL set or get functions. 232 */ 233 #define subsys_param_cb(name, ops, arg, perm) \ 234 __level_param_cb(name, ops, arg, perm, 4) 235 236 /** 237 * fs_param_cb - general callback for a module/cmdline parameter 238 * to be evaluated before fs initcall level 239 * @name: a valid C identifier which is the parameter name. 240 * @ops: the set & get operations for this parameter. 241 * @arg: args for @ops 242 * @perm: visibility in sysfs. 243 * 244 * The ops can have NULL set or get functions. 245 */ 246 #define fs_param_cb(name, ops, arg, perm) \ 247 __level_param_cb(name, ops, arg, perm, 5) 248 249 /** 250 * device_param_cb - general callback for a module/cmdline parameter 251 * to be evaluated before device initcall level 252 * @name: a valid C identifier which is the parameter name. 253 * @ops: the set & get operations for this parameter. 254 * @arg: args for @ops 255 * @perm: visibility in sysfs. 256 * 257 * The ops can have NULL set or get functions. 258 */ 259 #define device_param_cb(name, ops, arg, perm) \ 260 __level_param_cb(name, ops, arg, perm, 6) 261 262 /** 263 * late_param_cb - general callback for a module/cmdline parameter 264 * to be evaluated before late initcall level 265 * @name: a valid C identifier which is the parameter name. 266 * @ops: the set & get operations for this parameter. 267 * @arg: args for @ops 268 * @perm: visibility in sysfs. 269 * 270 * The ops can have NULL set or get functions. 271 */ 272 #define late_param_cb(name, ops, arg, perm) \ 273 __level_param_cb(name, ops, arg, perm, 7) 274 275 /* On alpha, ia64 and ppc64 relocations to global data cannot go into 276 read-only sections (which is part of respective UNIX ABI on these 277 platforms). So 'const' makes no sense and even causes compile failures 278 with some compilers. */ 279 #if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64) 280 #define __moduleparam_const 281 #else 282 #define __moduleparam_const const 283 #endif 284 285 /* This is the fundamental function for registering boot/module 286 parameters. */ 287 #define __module_param_call(prefix, name, ops, arg, perm, level, flags) \ 288 /* Default value instead of permissions? */ \ 289 static const char __param_str_##name[] = prefix #name; \ 290 static struct kernel_param __moduleparam_const __param_##name \ 291 __used __section("__param") \ 292 __aligned(__alignof__(struct kernel_param)) \ 293 = { __param_str_##name, THIS_MODULE, ops, \ 294 VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } } 295 296 /* Obsolete - use module_param_cb() */ 297 #define module_param_call(name, _set, _get, arg, perm) \ 298 static const struct kernel_param_ops __param_ops_##name = \ 299 { .flags = 0, .set = _set, .get = _get }; \ 300 __module_param_call(MODULE_PARAM_PREFIX, \ 301 name, &__param_ops_##name, arg, perm, -1, 0) 302 303 #ifdef CONFIG_SYSFS 304 extern void kernel_param_lock(struct module *mod); 305 extern void kernel_param_unlock(struct module *mod); 306 #else kernel_param_lock(struct module * mod)307 static inline void kernel_param_lock(struct module *mod) 308 { 309 } kernel_param_unlock(struct module * mod)310 static inline void kernel_param_unlock(struct module *mod) 311 { 312 } 313 #endif 314 315 #ifndef MODULE 316 /** 317 * core_param - define a historical core kernel parameter. 318 * @name: the name of the cmdline and sysfs parameter (often the same as var) 319 * @var: the variable 320 * @type: the type of the parameter 321 * @perm: visibility in sysfs 322 * 323 * core_param is just like module_param(), but cannot be modular and 324 * doesn't add a prefix (such as "printk."). This is for compatibility 325 * with __setup(), and it makes sense as truly core parameters aren't 326 * tied to the particular file they're in. 327 */ 328 #define core_param(name, var, type, perm) \ 329 param_check_##type(name, &(var)); \ 330 __module_param_call("", name, ¶m_ops_##type, &var, perm, -1, 0) 331 332 /** 333 * core_param_unsafe - same as core_param but taints kernel 334 * @name: the name of the cmdline and sysfs parameter (often the same as var) 335 * @var: the variable 336 * @type: the type of the parameter 337 * @perm: visibility in sysfs 338 */ 339 #define core_param_unsafe(name, var, type, perm) \ 340 param_check_##type(name, &(var)); \ 341 __module_param_call("", name, ¶m_ops_##type, &var, perm, \ 342 -1, KERNEL_PARAM_FL_UNSAFE) 343 344 #endif /* !MODULE */ 345 346 /** 347 * module_param_string - a char array parameter 348 * @name: the name of the parameter 349 * @string: the string variable 350 * @len: the maximum length of the string, incl. terminator 351 * @perm: visibility in sysfs. 352 * 353 * This actually copies the string when it's set (unlike type charp). 354 * @len is usually just sizeof(string). 355 */ 356 #define module_param_string(name, string, len, perm) \ 357 static const struct kparam_string __param_string_##name \ 358 = { len, string }; \ 359 __module_param_call(MODULE_PARAM_PREFIX, name, \ 360 ¶m_ops_string, \ 361 .str = &__param_string_##name, perm, -1, 0);\ 362 __MODULE_PARM_TYPE(name, "string") 363 364 /** 365 * parameq - checks if two parameter names match 366 * @name1: parameter name 1 367 * @name2: parameter name 2 368 * 369 * Returns true if the two parameter names are equal. 370 * Dashes (-) are considered equal to underscores (_). 371 */ 372 extern bool parameq(const char *name1, const char *name2); 373 374 /** 375 * parameqn - checks if two parameter names match 376 * @name1: parameter name 1 377 * @name2: parameter name 2 378 * @n: the length to compare 379 * 380 * Similar to parameq(), except it compares @n characters. 381 */ 382 extern bool parameqn(const char *name1, const char *name2, size_t n); 383 384 /* Called on module insert or kernel boot */ 385 extern char *parse_args(const char *name, 386 char *args, 387 const struct kernel_param *params, 388 unsigned num, 389 s16 level_min, 390 s16 level_max, 391 void *arg, 392 int (*unknown)(char *param, char *val, 393 const char *doing, void *arg)); 394 395 /* Called by module remove. */ 396 #ifdef CONFIG_SYSFS 397 extern void destroy_params(const struct kernel_param *params, unsigned num); 398 #else destroy_params(const struct kernel_param * params,unsigned num)399 static inline void destroy_params(const struct kernel_param *params, 400 unsigned num) 401 { 402 } 403 #endif /* !CONFIG_SYSFS */ 404 405 /* All the helper functions */ 406 /* The macros to do compile-time type checking stolen from Jakub 407 Jelinek, who IIRC came up with this idea for the 2.4 module init code. */ 408 #define __param_check(name, p, type) \ 409 static inline type __always_unused *__check_##name(void) { return(p); } 410 411 extern const struct kernel_param_ops param_ops_byte; 412 extern int param_set_byte(const char *val, const struct kernel_param *kp); 413 extern int param_get_byte(char *buffer, const struct kernel_param *kp); 414 #define param_check_byte(name, p) __param_check(name, p, unsigned char) 415 416 extern const struct kernel_param_ops param_ops_short; 417 extern int param_set_short(const char *val, const struct kernel_param *kp); 418 extern int param_get_short(char *buffer, const struct kernel_param *kp); 419 #define param_check_short(name, p) __param_check(name, p, short) 420 421 extern const struct kernel_param_ops param_ops_ushort; 422 extern int param_set_ushort(const char *val, const struct kernel_param *kp); 423 extern int param_get_ushort(char *buffer, const struct kernel_param *kp); 424 #define param_check_ushort(name, p) __param_check(name, p, unsigned short) 425 426 extern const struct kernel_param_ops param_ops_int; 427 extern int param_set_int(const char *val, const struct kernel_param *kp); 428 extern int param_get_int(char *buffer, const struct kernel_param *kp); 429 #define param_check_int(name, p) __param_check(name, p, int) 430 431 extern const struct kernel_param_ops param_ops_uint; 432 extern int param_set_uint(const char *val, const struct kernel_param *kp); 433 extern int param_get_uint(char *buffer, const struct kernel_param *kp); 434 int param_set_uint_minmax(const char *val, const struct kernel_param *kp, 435 unsigned int min, unsigned int max); 436 #define param_check_uint(name, p) __param_check(name, p, unsigned int) 437 438 extern const struct kernel_param_ops param_ops_long; 439 extern int param_set_long(const char *val, const struct kernel_param *kp); 440 extern int param_get_long(char *buffer, const struct kernel_param *kp); 441 #define param_check_long(name, p) __param_check(name, p, long) 442 443 extern const struct kernel_param_ops param_ops_ulong; 444 extern int param_set_ulong(const char *val, const struct kernel_param *kp); 445 extern int param_get_ulong(char *buffer, const struct kernel_param *kp); 446 #define param_check_ulong(name, p) __param_check(name, p, unsigned long) 447 448 extern const struct kernel_param_ops param_ops_ullong; 449 extern int param_set_ullong(const char *val, const struct kernel_param *kp); 450 extern int param_get_ullong(char *buffer, const struct kernel_param *kp); 451 #define param_check_ullong(name, p) __param_check(name, p, unsigned long long) 452 453 extern const struct kernel_param_ops param_ops_hexint; 454 extern int param_set_hexint(const char *val, const struct kernel_param *kp); 455 extern int param_get_hexint(char *buffer, const struct kernel_param *kp); 456 #define param_check_hexint(name, p) param_check_uint(name, p) 457 458 extern const struct kernel_param_ops param_ops_charp; 459 extern int param_set_charp(const char *val, const struct kernel_param *kp); 460 extern int param_get_charp(char *buffer, const struct kernel_param *kp); 461 extern void param_free_charp(void *arg); 462 #define param_check_charp(name, p) __param_check(name, p, char *) 463 464 /* We used to allow int as well as bool. We're taking that away! */ 465 extern const struct kernel_param_ops param_ops_bool; 466 extern int param_set_bool(const char *val, const struct kernel_param *kp); 467 extern int param_get_bool(char *buffer, const struct kernel_param *kp); 468 #define param_check_bool(name, p) __param_check(name, p, bool) 469 470 extern const struct kernel_param_ops param_ops_bool_enable_only; 471 extern int param_set_bool_enable_only(const char *val, 472 const struct kernel_param *kp); 473 /* getter is the same as for the regular bool */ 474 #define param_check_bool_enable_only param_check_bool 475 476 extern const struct kernel_param_ops param_ops_invbool; 477 extern int param_set_invbool(const char *val, const struct kernel_param *kp); 478 extern int param_get_invbool(char *buffer, const struct kernel_param *kp); 479 #define param_check_invbool(name, p) __param_check(name, p, bool) 480 481 /* An int, which can only be set like a bool (though it shows as an int). */ 482 extern const struct kernel_param_ops param_ops_bint; 483 extern int param_set_bint(const char *val, const struct kernel_param *kp); 484 #define param_get_bint param_get_int 485 #define param_check_bint param_check_int 486 487 /** 488 * module_param_array - a parameter which is an array of some type 489 * @name: the name of the array variable 490 * @type: the type, as per module_param() 491 * @nump: optional pointer filled in with the number written 492 * @perm: visibility in sysfs 493 * 494 * Input and output are as comma-separated values. Commas inside values 495 * don't work properly (eg. an array of charp). 496 * 497 * ARRAY_SIZE(@name) is used to determine the number of elements in the 498 * array, so the definition must be visible. 499 */ 500 #define module_param_array(name, type, nump, perm) \ 501 module_param_array_named(name, name, type, nump, perm) 502 503 /** 504 * module_param_array_named - renamed parameter which is an array of some type 505 * @name: a valid C identifier which is the parameter name 506 * @array: the name of the array variable 507 * @type: the type, as per module_param() 508 * @nump: optional pointer filled in with the number written 509 * @perm: visibility in sysfs 510 * 511 * This exposes a different name than the actual variable name. See 512 * module_param_named() for why this might be necessary. 513 */ 514 #define module_param_array_named(name, array, type, nump, perm) \ 515 param_check_##type(name, &(array)[0]); \ 516 static const struct kparam_array __param_arr_##name \ 517 = { .max = ARRAY_SIZE(array), .num = nump, \ 518 .ops = ¶m_ops_##type, \ 519 .elemsize = sizeof(array[0]), .elem = array }; \ 520 __module_param_call(MODULE_PARAM_PREFIX, name, \ 521 ¶m_array_ops, \ 522 .arr = &__param_arr_##name, \ 523 perm, -1, 0); \ 524 __MODULE_PARM_TYPE(name, "array of " #type) 525 526 enum hwparam_type { 527 hwparam_ioport, /* Module parameter configures an I/O port */ 528 hwparam_iomem, /* Module parameter configures an I/O mem address */ 529 hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */ 530 hwparam_irq, /* Module parameter configures an IRQ */ 531 hwparam_dma, /* Module parameter configures a DMA channel */ 532 hwparam_dma_addr, /* Module parameter configures a DMA buffer address */ 533 hwparam_other, /* Module parameter configures some other value */ 534 }; 535 536 /** 537 * module_param_hw_named - A parameter representing a hw parameters 538 * @name: a valid C identifier which is the parameter name. 539 * @value: the actual lvalue to alter. 540 * @type: the type of the parameter 541 * @hwtype: what the value represents (enum hwparam_type) 542 * @perm: visibility in sysfs. 543 * 544 * Usually it's a good idea to have variable names and user-exposed names the 545 * same, but that's harder if the variable must be non-static or is inside a 546 * structure. This allows exposure under a different name. 547 */ 548 #define module_param_hw_named(name, value, type, hwtype, perm) \ 549 param_check_##type(name, &(value)); \ 550 __module_param_call(MODULE_PARAM_PREFIX, name, \ 551 ¶m_ops_##type, &value, \ 552 perm, -1, \ 553 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \ 554 __MODULE_PARM_TYPE(name, #type) 555 556 #define module_param_hw(name, type, hwtype, perm) \ 557 module_param_hw_named(name, name, type, hwtype, perm) 558 559 /** 560 * module_param_hw_array - A parameter representing an array of hw parameters 561 * @name: the name of the array variable 562 * @type: the type, as per module_param() 563 * @hwtype: what the value represents (enum hwparam_type) 564 * @nump: optional pointer filled in with the number written 565 * @perm: visibility in sysfs 566 * 567 * Input and output are as comma-separated values. Commas inside values 568 * don't work properly (eg. an array of charp). 569 * 570 * ARRAY_SIZE(@name) is used to determine the number of elements in the 571 * array, so the definition must be visible. 572 */ 573 #define module_param_hw_array(name, type, hwtype, nump, perm) \ 574 param_check_##type(name, &(name)[0]); \ 575 static const struct kparam_array __param_arr_##name \ 576 = { .max = ARRAY_SIZE(name), .num = nump, \ 577 .ops = ¶m_ops_##type, \ 578 .elemsize = sizeof(name[0]), .elem = name }; \ 579 __module_param_call(MODULE_PARAM_PREFIX, name, \ 580 ¶m_array_ops, \ 581 .arr = &__param_arr_##name, \ 582 perm, -1, \ 583 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \ 584 __MODULE_PARM_TYPE(name, "array of " #type) 585 586 587 extern const struct kernel_param_ops param_array_ops; 588 589 extern const struct kernel_param_ops param_ops_string; 590 extern int param_set_copystring(const char *val, const struct kernel_param *); 591 extern int param_get_string(char *buffer, const struct kernel_param *kp); 592 593 /* for exporting parameters in /sys/module/.../parameters */ 594 595 struct module; 596 597 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES) 598 extern int module_param_sysfs_setup(struct module *mod, 599 const struct kernel_param *kparam, 600 unsigned int num_params); 601 602 extern void module_param_sysfs_remove(struct module *mod); 603 #else module_param_sysfs_setup(struct module * mod,const struct kernel_param * kparam,unsigned int num_params)604 static inline int module_param_sysfs_setup(struct module *mod, 605 const struct kernel_param *kparam, 606 unsigned int num_params) 607 { 608 return 0; 609 } 610 module_param_sysfs_remove(struct module * mod)611 static inline void module_param_sysfs_remove(struct module *mod) 612 { } 613 #endif 614 615 #endif /* _LINUX_MODULE_PARAMS_H */ 616