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/*
10 * The maximum module name length, including the NUL byte.
11 * Chosen so that structs with an unsigned long line up, specifically
12 * modversion_info.
13 */
14#define __MODULE_NAME_LEN (64 - sizeof(unsigned long))
15
16/* You can override this manually, but generally this should match the
17 module name. */
18#ifdef MODULE
19#define MODULE_PARAM_PREFIX /* empty */
20#define __MODULE_INFO_PREFIX /* empty */
21#else
22#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
23/* We cannot use MODULE_PARAM_PREFIX because some modules override it. */
24#define __MODULE_INFO_PREFIX KBUILD_MODNAME "."
25#endif
26
27/* Generic info of form tag = "info" */
28#define MODULE_INFO(tag, info) \
29 static const char __UNIQUE_ID(modinfo)[] \
30 __used __section(".modinfo") __aligned(1) \
31 = __MODULE_INFO_PREFIX __stringify(tag) "=" info
32
33#define __MODULE_PARM_TYPE(name, _type) \
34 MODULE_INFO(parmtype, #name ":" _type)
35
36/* One for each parameter, describing how to use it. Some files do
37 multiple of these per line, so can't just use MODULE_INFO. */
38#define MODULE_PARM_DESC(_parm, desc) \
39 MODULE_INFO(parm, #_parm ":" desc)
40
41struct kernel_param;
42
43/*
44 * Flags available for kernel_param_ops
45 *
46 * NOARG - the parameter allows for no argument (foo instead of foo=1)
47 */
48enum {
49 KERNEL_PARAM_OPS_FL_NOARG = (1 << 0)
50};
51
52struct kernel_param_ops {
53 /* How the ops should behave */
54 unsigned int flags;
55 /* Returns 0, or -errno. arg is in kp->arg. */
56 int (*set)(const char *val, const struct kernel_param *kp);
57 /* Returns length written or -errno. Buffer is 4k (ie. be short!) */
58 int (*get)(char *buffer, const struct kernel_param *kp);
59 /* Optional function to free kp->arg when module unloaded. */
60 void (*free)(void *arg);
61};
62
63/*
64 * Flags available for kernel_param
65 *
66 * UNSAFE - the parameter is dangerous and setting it will taint the kernel
67 * HWPARAM - Hardware param not permitted in lockdown mode
68 */
69enum {
70 KERNEL_PARAM_FL_UNSAFE = (1 << 0),
71 KERNEL_PARAM_FL_HWPARAM = (1 << 1),
72};
73
74struct kernel_param {
75 const char *name;
76 struct module *mod;
77 const struct kernel_param_ops *ops;
78 const u16 perm;
79 s8 level;
80 u8 flags;
81 union {
82 void *arg;
83 const struct kparam_string *str;
84 const struct kparam_array *arr;
85 };
86};
87
88extern const struct kernel_param __start___param[], __stop___param[];
89
90/* Special one for strings we want to copy into */
91struct kparam_string {
92 unsigned int maxlen;
93 char *string;
94};
95
96/* Special one for arrays */
97struct kparam_array
98{
99 unsigned int max;
100 unsigned int elemsize;
101 unsigned int *num;
102 const struct kernel_param_ops *ops;
103 void *elem;
104};
105
106/**
107 * module_param - typesafe helper for a module/cmdline parameter
108 * @name: the variable to alter, and exposed parameter name.
109 * @type: the type of the parameter
110 * @perm: visibility in sysfs.
111 *
112 * @name becomes the module parameter, or (prefixed by KBUILD_MODNAME and a
113 * ".") the kernel commandline parameter. Note that - is changed to _, so
114 * the user can use "foo-bar=1" even for variable "foo_bar".
115 *
116 * @perm is 0 if the variable is not to appear in sysfs, or 0444
117 * for world-readable, 0644 for root-writable, etc. Note that if it
118 * is writable, you may need to use kernel_param_lock() around
119 * accesses (esp. charp, which can be kfreed when it changes).
120 *
121 * The @type is simply pasted to refer to a param_ops_##type and a
122 * param_check_##type: for convenience many standard types are provided but
123 * you can create your own by defining those variables.
124 *
125 * Standard types are:
126 * byte, hexint, short, ushort, int, uint, long, ulong
127 * charp: a character pointer
128 * bool: a bool, values 0/1, y/n, Y/N.
129 * invbool: the above, only sense-reversed (N = true).
130 */
131#define module_param(name, type, perm) \
132 module_param_named(name, name, type, perm)
133
134/**
135 * module_param_unsafe - same as module_param but taints kernel
136 * @name: the variable to alter, and exposed parameter name.
137 * @type: the type of the parameter
138 * @perm: visibility in sysfs.
139 */
140#define module_param_unsafe(name, type, perm) \
141 module_param_named_unsafe(name, name, type, perm)
142
143/**
144 * module_param_named - typesafe helper for a renamed module/cmdline parameter
145 * @name: a valid C identifier which is the parameter name.
146 * @value: the actual lvalue to alter.
147 * @type: the type of the parameter
148 * @perm: visibility in sysfs.
149 *
150 * Usually it's a good idea to have variable names and user-exposed names the
151 * same, but that's harder if the variable must be non-static or is inside a
152 * structure. This allows exposure under a different name.
153 */
154#define module_param_named(name, value, type, perm) \
155 param_check_##type(name, &(value)); \
156 module_param_cb(name, &param_ops_##type, &value, perm); \
157 __MODULE_PARM_TYPE(name, #type)
158
159/**
160 * module_param_named_unsafe - same as module_param_named but taints kernel
161 * @name: a valid C identifier which is the parameter name.
162 * @value: the actual lvalue to alter.
163 * @type: the type of the parameter
164 * @perm: visibility in sysfs.
165 */
166#define module_param_named_unsafe(name, value, type, perm) \
167 param_check_##type(name, &(value)); \
168 module_param_cb_unsafe(name, &param_ops_##type, &value, perm); \
169 __MODULE_PARM_TYPE(name, #type)
170
171/**
172 * module_param_cb - general callback for a module/cmdline parameter
173 * @name: a valid C identifier which is the parameter name.
174 * @ops: the set & get operations for this parameter.
175 * @arg: args for @ops
176 * @perm: visibility in sysfs.
177 *
178 * The ops can have NULL set or get functions.
179 */
180#define module_param_cb(name, ops, arg, perm) \
181 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)
182
183#define module_param_cb_unsafe(name, ops, arg, perm) \
184 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \
185 KERNEL_PARAM_FL_UNSAFE)
186
187#define __level_param_cb(name, ops, arg, perm, level) \
188 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0)
189/**
190 * core_param_cb - general callback for a module/cmdline parameter
191 * to be evaluated before core initcall level
192 * @name: a valid C identifier which is the parameter name.
193 * @ops: the set & get operations for this parameter.
194 * @arg: args for @ops
195 * @perm: visibility in sysfs.
196 *
197 * The ops can have NULL set or get functions.
198 */
199#define core_param_cb(name, ops, arg, perm) \
200 __level_param_cb(name, ops, arg, perm, 1)
201
202/**
203 * postcore_param_cb - general callback for a module/cmdline parameter
204 * to be evaluated before postcore initcall level
205 * @name: a valid C identifier which is the parameter name.
206 * @ops: the set & get operations for this parameter.
207 * @arg: args for @ops
208 * @perm: visibility in sysfs.
209 *
210 * The ops can have NULL set or get functions.
211 */
212#define postcore_param_cb(name, ops, arg, perm) \
213 __level_param_cb(name, ops, arg, perm, 2)
214
215/**
216 * arch_param_cb - general callback for a module/cmdline parameter
217 * to be evaluated before arch initcall level
218 * @name: a valid C identifier which is the parameter name.
219 * @ops: the set & get operations for this parameter.
220 * @arg: args for @ops
221 * @perm: visibility in sysfs.
222 *
223 * The ops can have NULL set or get functions.
224 */
225#define arch_param_cb(name, ops, arg, perm) \
226 __level_param_cb(name, ops, arg, perm, 3)
227
228/**
229 * subsys_param_cb - general callback for a module/cmdline parameter
230 * to be evaluated before subsys initcall level
231 * @name: a valid C identifier which is the parameter name.
232 * @ops: the set & get operations for this parameter.
233 * @arg: args for @ops
234 * @perm: visibility in sysfs.
235 *
236 * The ops can have NULL set or get functions.
237 */
238#define subsys_param_cb(name, ops, arg, perm) \
239 __level_param_cb(name, ops, arg, perm, 4)
240
241/**
242 * fs_param_cb - general callback for a module/cmdline parameter
243 * to be evaluated before fs initcall level
244 * @name: a valid C identifier which is the parameter name.
245 * @ops: the set & get operations for this parameter.
246 * @arg: args for @ops
247 * @perm: visibility in sysfs.
248 *
249 * The ops can have NULL set or get functions.
250 */
251#define fs_param_cb(name, ops, arg, perm) \
252 __level_param_cb(name, ops, arg, perm, 5)
253
254/**
255 * device_param_cb - general callback for a module/cmdline parameter
256 * to be evaluated before device initcall level
257 * @name: a valid C identifier which is the parameter name.
258 * @ops: the set & get operations for this parameter.
259 * @arg: args for @ops
260 * @perm: visibility in sysfs.
261 *
262 * The ops can have NULL set or get functions.
263 */
264#define device_param_cb(name, ops, arg, perm) \
265 __level_param_cb(name, ops, arg, perm, 6)
266
267/**
268 * late_param_cb - general callback for a module/cmdline parameter
269 * to be evaluated before late initcall level
270 * @name: a valid C identifier which is the parameter name.
271 * @ops: the set & get operations for this parameter.
272 * @arg: args for @ops
273 * @perm: visibility in sysfs.
274 *
275 * The ops can have NULL set or get functions.
276 */
277#define late_param_cb(name, ops, arg, perm) \
278 __level_param_cb(name, ops, arg, perm, 7)
279
280/* On alpha, ia64 and ppc64 relocations to global data cannot go into
281 read-only sections (which is part of respective UNIX ABI on these
282 platforms). So 'const' makes no sense and even causes compile failures
283 with some compilers. */
284#if defined(CONFIG_ALPHA) || defined(CONFIG_PPC64)
285#define __moduleparam_const
286#else
287#define __moduleparam_const const
288#endif
289
290/* This is the fundamental function for registering boot/module parameters. */
291#define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
292 static_assert(sizeof(""prefix) - 1 <= __MODULE_NAME_LEN); \
293 static const char __param_str_##name[] = prefix #name; \
294 static struct kernel_param __moduleparam_const __param_##name \
295 __used __section("__param") \
296 __aligned(__alignof__(struct kernel_param)) \
297 = { __param_str_##name, THIS_MODULE, ops, \
298 VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
299
300/*
301 * Useful for describing a set/get pair used only once (i.e. for this
302 * parameter). For repeated set/get pairs (i.e. the same struct
303 * kernel_param_ops), use module_param_cb() instead.
304 */
305#define module_param_call(name, _set, _get, arg, perm) \
306 static const struct kernel_param_ops __param_ops_##name = \
307 { .flags = 0, .set = _set, .get = _get }; \
308 __module_param_call(MODULE_PARAM_PREFIX, \
309 name, &__param_ops_##name, arg, perm, -1, 0)
310
311#ifdef CONFIG_SYSFS
312extern void kernel_param_lock(struct module *mod);
313extern void kernel_param_unlock(struct module *mod);
314#else
315static inline void kernel_param_lock(struct module *mod)
316{
317}
318static inline void kernel_param_unlock(struct module *mod)
319{
320}
321#endif
322
323#ifndef MODULE
324/**
325 * core_param - define a historical core kernel parameter.
326 * @name: the name of the cmdline and sysfs parameter (often the same as var)
327 * @var: the variable
328 * @type: the type of the parameter
329 * @perm: visibility in sysfs
330 *
331 * core_param is just like module_param(), but cannot be modular and
332 * doesn't add a prefix (such as "printk."). This is for compatibility
333 * with __setup(), and it makes sense as truly core parameters aren't
334 * tied to the particular file they're in.
335 */
336#define core_param(name, var, type, perm) \
337 param_check_##type(name, &(var)); \
338 __module_param_call("", name, &param_ops_##type, &var, perm, -1, 0)
339
340/**
341 * core_param_unsafe - same as core_param but taints kernel
342 * @name: the name of the cmdline and sysfs parameter (often the same as var)
343 * @var: the variable
344 * @type: the type of the parameter
345 * @perm: visibility in sysfs
346 */
347#define core_param_unsafe(name, var, type, perm) \
348 param_check_##type(name, &(var)); \
349 __module_param_call("", name, &param_ops_##type, &var, perm, \
350 -1, KERNEL_PARAM_FL_UNSAFE)
351
352/**
353 * __core_param_cb - similar like core_param, with a set/get ops instead of type.
354 * @name: the name of the cmdline and sysfs parameter (often the same as var)
355 * @var: the variable
356 * @ops: the set & get operations for this parameter.
357 * @perm: visibility in sysfs
358 *
359 * Ideally this should be called 'core_param_cb', but the name has been
360 * used for module core parameter, so add the '__' prefix
361 */
362#define __core_param_cb(name, ops, arg, perm) \
363 __module_param_call("", name, ops, arg, perm, -1, 0)
364
365#endif /* !MODULE */
366
367/**
368 * module_param_string - a char array parameter
369 * @name: the name of the parameter
370 * @string: the string variable
371 * @len: the maximum length of the string, incl. terminator
372 * @perm: visibility in sysfs.
373 *
374 * This actually copies the string when it's set (unlike type charp).
375 * @len is usually just sizeof(string).
376 */
377#define module_param_string(name, string, len, perm) \
378 static const struct kparam_string __param_string_##name \
379 = { len, string }; \
380 __module_param_call(MODULE_PARAM_PREFIX, name, \
381 &param_ops_string, \
382 .str = &__param_string_##name, perm, -1, 0);\
383 __MODULE_PARM_TYPE(name, "string")
384
385/**
386 * parameq - checks if two parameter names match
387 * @name1: parameter name 1
388 * @name2: parameter name 2
389 *
390 * Returns true if the two parameter names are equal.
391 * Dashes (-) are considered equal to underscores (_).
392 */
393extern bool parameq(const char *name1, const char *name2);
394
395/**
396 * parameqn - checks if two parameter names match
397 * @name1: parameter name 1
398 * @name2: parameter name 2
399 * @n: the length to compare
400 *
401 * Similar to parameq(), except it compares @n characters.
402 */
403extern bool parameqn(const char *name1, const char *name2, size_t n);
404
405typedef int (*parse_unknown_fn)(char *param, char *val, const char *doing, void *arg);
406
407/* Called on module insert or kernel boot */
408extern char *parse_args(const char *name,
409 char *args,
410 const struct kernel_param *params,
411 unsigned num,
412 s16 level_min,
413 s16 level_max,
414 void *arg, parse_unknown_fn unknown);
415
416/* Called by module remove. */
417#ifdef CONFIG_SYSFS
418extern void destroy_params(const struct kernel_param *params, unsigned num);
419#else
420static inline void destroy_params(const struct kernel_param *params,
421 unsigned num)
422{
423}
424#endif /* !CONFIG_SYSFS */
425
426/* All the helper functions */
427/* The macros to do compile-time type checking stolen from Jakub
428 Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
429#define __param_check(name, p, type) \
430 static inline type __always_unused *__check_##name(void) { return(p); }
431
432extern const struct kernel_param_ops param_ops_byte;
433extern int param_set_byte(const char *val, const struct kernel_param *kp);
434extern int param_get_byte(char *buffer, const struct kernel_param *kp);
435#define param_check_byte(name, p) __param_check(name, p, unsigned char)
436
437extern const struct kernel_param_ops param_ops_short;
438extern int param_set_short(const char *val, const struct kernel_param *kp);
439extern int param_get_short(char *buffer, const struct kernel_param *kp);
440#define param_check_short(name, p) __param_check(name, p, short)
441
442extern const struct kernel_param_ops param_ops_ushort;
443extern int param_set_ushort(const char *val, const struct kernel_param *kp);
444extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
445#define param_check_ushort(name, p) __param_check(name, p, unsigned short)
446
447extern const struct kernel_param_ops param_ops_int;
448extern int param_set_int(const char *val, const struct kernel_param *kp);
449extern int param_get_int(char *buffer, const struct kernel_param *kp);
450#define param_check_int(name, p) __param_check(name, p, int)
451
452extern const struct kernel_param_ops param_ops_uint;
453extern int param_set_uint(const char *val, const struct kernel_param *kp);
454extern int param_get_uint(char *buffer, const struct kernel_param *kp);
455int param_set_uint_minmax(const char *val, const struct kernel_param *kp,
456 unsigned int min, unsigned int max);
457#define param_check_uint(name, p) __param_check(name, p, unsigned int)
458
459extern const struct kernel_param_ops param_ops_long;
460extern int param_set_long(const char *val, const struct kernel_param *kp);
461extern int param_get_long(char *buffer, const struct kernel_param *kp);
462#define param_check_long(name, p) __param_check(name, p, long)
463
464extern const struct kernel_param_ops param_ops_ulong;
465extern int param_set_ulong(const char *val, const struct kernel_param *kp);
466extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
467#define param_check_ulong(name, p) __param_check(name, p, unsigned long)
468
469extern const struct kernel_param_ops param_ops_ullong;
470extern int param_set_ullong(const char *val, const struct kernel_param *kp);
471extern int param_get_ullong(char *buffer, const struct kernel_param *kp);
472#define param_check_ullong(name, p) __param_check(name, p, unsigned long long)
473
474extern const struct kernel_param_ops param_ops_hexint;
475extern int param_set_hexint(const char *val, const struct kernel_param *kp);
476extern int param_get_hexint(char *buffer, const struct kernel_param *kp);
477#define param_check_hexint(name, p) param_check_uint(name, p)
478
479extern const struct kernel_param_ops param_ops_charp;
480extern int param_set_charp(const char *val, const struct kernel_param *kp);
481extern int param_get_charp(char *buffer, const struct kernel_param *kp);
482extern void param_free_charp(void *arg);
483#define param_check_charp(name, p) __param_check(name, p, char *)
484
485/* We used to allow int as well as bool. We're taking that away! */
486extern const struct kernel_param_ops param_ops_bool;
487extern int param_set_bool(const char *val, const struct kernel_param *kp);
488extern int param_get_bool(char *buffer, const struct kernel_param *kp);
489#define param_check_bool(name, p) __param_check(name, p, bool)
490
491extern const struct kernel_param_ops param_ops_bool_enable_only;
492extern int param_set_bool_enable_only(const char *val,
493 const struct kernel_param *kp);
494/* getter is the same as for the regular bool */
495#define param_check_bool_enable_only param_check_bool
496
497extern const struct kernel_param_ops param_ops_invbool;
498extern int param_set_invbool(const char *val, const struct kernel_param *kp);
499extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
500#define param_check_invbool(name, p) __param_check(name, p, bool)
501
502/* An int, which can only be set like a bool (though it shows as an int). */
503extern const struct kernel_param_ops param_ops_bint;
504extern int param_set_bint(const char *val, const struct kernel_param *kp);
505#define param_get_bint param_get_int
506#define param_check_bint param_check_int
507
508/**
509 * module_param_array - a parameter which is an array of some type
510 * @name: the name of the array variable
511 * @type: the type, as per module_param()
512 * @nump: optional pointer filled in with the number written
513 * @perm: visibility in sysfs
514 *
515 * Input and output are as comma-separated values. Commas inside values
516 * don't work properly (eg. an array of charp).
517 *
518 * ARRAY_SIZE(@name) is used to determine the number of elements in the
519 * array, so the definition must be visible.
520 */
521#define module_param_array(name, type, nump, perm) \
522 module_param_array_named(name, name, type, nump, perm)
523
524/**
525 * module_param_array_named - renamed parameter which is an array of some type
526 * @name: a valid C identifier which is the parameter name
527 * @array: the name of the array variable
528 * @type: the type, as per module_param()
529 * @nump: optional pointer filled in with the number written
530 * @perm: visibility in sysfs
531 *
532 * This exposes a different name than the actual variable name. See
533 * module_param_named() for why this might be necessary.
534 */
535#define module_param_array_named(name, array, type, nump, perm) \
536 param_check_##type(name, &(array)[0]); \
537 static const struct kparam_array __param_arr_##name \
538 = { .max = ARRAY_SIZE(array), .num = nump, \
539 .ops = &param_ops_##type, \
540 .elemsize = sizeof(array[0]), .elem = array }; \
541 __module_param_call(MODULE_PARAM_PREFIX, name, \
542 &param_array_ops, \
543 .arr = &__param_arr_##name, \
544 perm, -1, 0); \
545 __MODULE_PARM_TYPE(name, "array of " #type)
546
547enum hwparam_type {
548 hwparam_ioport, /* Module parameter configures an I/O port */
549 hwparam_iomem, /* Module parameter configures an I/O mem address */
550 hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
551 hwparam_irq, /* Module parameter configures an IRQ */
552 hwparam_dma, /* Module parameter configures a DMA channel */
553 hwparam_dma_addr, /* Module parameter configures a DMA buffer address */
554 hwparam_other, /* Module parameter configures some other value */
555};
556
557/**
558 * module_param_hw_named - A parameter representing a hw parameters
559 * @name: a valid C identifier which is the parameter name.
560 * @value: the actual lvalue to alter.
561 * @type: the type of the parameter
562 * @hwtype: what the value represents (enum hwparam_type)
563 * @perm: visibility in sysfs.
564 *
565 * Usually it's a good idea to have variable names and user-exposed names the
566 * same, but that's harder if the variable must be non-static or is inside a
567 * structure. This allows exposure under a different name.
568 */
569#define module_param_hw_named(name, value, type, hwtype, perm) \
570 param_check_##type(name, &(value)); \
571 __module_param_call(MODULE_PARAM_PREFIX, name, \
572 &param_ops_##type, &value, \
573 perm, -1, \
574 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
575 __MODULE_PARM_TYPE(name, #type)
576
577#define module_param_hw(name, type, hwtype, perm) \
578 module_param_hw_named(name, name, type, hwtype, perm)
579
580/**
581 * module_param_hw_array - A parameter representing an array of hw parameters
582 * @name: the name of the array variable
583 * @type: the type, as per module_param()
584 * @hwtype: what the value represents (enum hwparam_type)
585 * @nump: optional pointer filled in with the number written
586 * @perm: visibility in sysfs
587 *
588 * Input and output are as comma-separated values. Commas inside values
589 * don't work properly (eg. an array of charp).
590 *
591 * ARRAY_SIZE(@name) is used to determine the number of elements in the
592 * array, so the definition must be visible.
593 */
594#define module_param_hw_array(name, type, hwtype, nump, perm) \
595 param_check_##type(name, &(name)[0]); \
596 static const struct kparam_array __param_arr_##name \
597 = { .max = ARRAY_SIZE(name), .num = nump, \
598 .ops = &param_ops_##type, \
599 .elemsize = sizeof(name[0]), .elem = name }; \
600 __module_param_call(MODULE_PARAM_PREFIX, name, \
601 &param_array_ops, \
602 .arr = &__param_arr_##name, \
603 perm, -1, \
604 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
605 __MODULE_PARM_TYPE(name, "array of " #type)
606
607
608extern const struct kernel_param_ops param_array_ops;
609
610extern const struct kernel_param_ops param_ops_string;
611extern int param_set_copystring(const char *val, const struct kernel_param *);
612extern int param_get_string(char *buffer, const struct kernel_param *kp);
613
614/* for exporting parameters in /sys/module/.../parameters */
615
616struct module;
617
618#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
619extern int module_param_sysfs_setup(struct module *mod,
620 const struct kernel_param *kparam,
621 unsigned int num_params);
622
623extern void module_param_sysfs_remove(struct module *mod);
624#else
625static inline int module_param_sysfs_setup(struct module *mod,
626 const struct kernel_param *kparam,
627 unsigned int num_params)
628{
629 return 0;
630}
631
632static inline void module_param_sysfs_remove(struct module *mod)
633{ }
634#endif
635
636#endif /* _LINUX_MODULE_PARAMS_H */
637