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_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 parameters. */
286 #define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
287 static_assert(sizeof(""prefix) - 1 <= MAX_PARAM_PREFIX_LEN); \
288 static const char __param_str_##name[] = prefix #name; \
289 static struct kernel_param __moduleparam_const __param_##name \
290 __used __section("__param") \
291 __aligned(__alignof__(struct kernel_param)) \
292 = { __param_str_##name, THIS_MODULE, ops, \
293 VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
294
295 /*
296 * Useful for describing a set/get pair used only once (i.e. for this
297 * parameter). For repeated set/get pairs (i.e. the same struct
298 * kernel_param_ops), use module_param_cb() instead.
299 */
300 #define module_param_call(name, _set, _get, arg, perm) \
301 static const struct kernel_param_ops __param_ops_##name = \
302 { .flags = 0, .set = _set, .get = _get }; \
303 __module_param_call(MODULE_PARAM_PREFIX, \
304 name, &__param_ops_##name, arg, perm, -1, 0)
305
306 #ifdef CONFIG_SYSFS
307 extern void kernel_param_lock(struct module *mod);
308 extern void kernel_param_unlock(struct module *mod);
309 #else
kernel_param_lock(struct module * mod)310 static inline void kernel_param_lock(struct module *mod)
311 {
312 }
kernel_param_unlock(struct module * mod)313 static inline void kernel_param_unlock(struct module *mod)
314 {
315 }
316 #endif
317
318 #ifndef MODULE
319 /**
320 * core_param - define a historical core kernel parameter.
321 * @name: the name of the cmdline and sysfs parameter (often the same as var)
322 * @var: the variable
323 * @type: the type of the parameter
324 * @perm: visibility in sysfs
325 *
326 * core_param is just like module_param(), but cannot be modular and
327 * doesn't add a prefix (such as "printk."). This is for compatibility
328 * with __setup(), and it makes sense as truly core parameters aren't
329 * tied to the particular file they're in.
330 */
331 #define core_param(name, var, type, perm) \
332 param_check_##type(name, &(var)); \
333 __module_param_call("", name, ¶m_ops_##type, &var, perm, -1, 0)
334
335 /**
336 * core_param_unsafe - same as core_param but taints kernel
337 * @name: the name of the cmdline and sysfs parameter (often the same as var)
338 * @var: the variable
339 * @type: the type of the parameter
340 * @perm: visibility in sysfs
341 */
342 #define core_param_unsafe(name, var, type, perm) \
343 param_check_##type(name, &(var)); \
344 __module_param_call("", name, ¶m_ops_##type, &var, perm, \
345 -1, KERNEL_PARAM_FL_UNSAFE)
346
347 #endif /* !MODULE */
348
349 /**
350 * module_param_string - a char array parameter
351 * @name: the name of the parameter
352 * @string: the string variable
353 * @len: the maximum length of the string, incl. terminator
354 * @perm: visibility in sysfs.
355 *
356 * This actually copies the string when it's set (unlike type charp).
357 * @len is usually just sizeof(string).
358 */
359 #define module_param_string(name, string, len, perm) \
360 static const struct kparam_string __param_string_##name \
361 = { len, string }; \
362 __module_param_call(MODULE_PARAM_PREFIX, name, \
363 ¶m_ops_string, \
364 .str = &__param_string_##name, perm, -1, 0);\
365 __MODULE_PARM_TYPE(name, "string")
366
367 /**
368 * parameq - checks if two parameter names match
369 * @name1: parameter name 1
370 * @name2: parameter name 2
371 *
372 * Returns true if the two parameter names are equal.
373 * Dashes (-) are considered equal to underscores (_).
374 */
375 extern bool parameq(const char *name1, const char *name2);
376
377 /**
378 * parameqn - checks if two parameter names match
379 * @name1: parameter name 1
380 * @name2: parameter name 2
381 * @n: the length to compare
382 *
383 * Similar to parameq(), except it compares @n characters.
384 */
385 extern bool parameqn(const char *name1, const char *name2, size_t n);
386
387 typedef int (*parse_unknown_fn)(char *param, char *val, const char *doing, void *arg);
388
389 /* Called on module insert or kernel boot */
390 extern char *parse_args(const char *name,
391 char *args,
392 const struct kernel_param *params,
393 unsigned num,
394 s16 level_min,
395 s16 level_max,
396 void *arg, parse_unknown_fn unknown);
397
398 /* Called by module remove. */
399 #ifdef CONFIG_SYSFS
400 extern void destroy_params(const struct kernel_param *params, unsigned num);
401 #else
destroy_params(const struct kernel_param * params,unsigned num)402 static inline void destroy_params(const struct kernel_param *params,
403 unsigned num)
404 {
405 }
406 #endif /* !CONFIG_SYSFS */
407
408 /* All the helper functions */
409 /* The macros to do compile-time type checking stolen from Jakub
410 Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
411 #define __param_check(name, p, type) \
412 static inline type __always_unused *__check_##name(void) { return(p); }
413
414 extern const struct kernel_param_ops param_ops_byte;
415 extern int param_set_byte(const char *val, const struct kernel_param *kp);
416 extern int param_get_byte(char *buffer, const struct kernel_param *kp);
417 #define param_check_byte(name, p) __param_check(name, p, unsigned char)
418
419 extern const struct kernel_param_ops param_ops_short;
420 extern int param_set_short(const char *val, const struct kernel_param *kp);
421 extern int param_get_short(char *buffer, const struct kernel_param *kp);
422 #define param_check_short(name, p) __param_check(name, p, short)
423
424 extern const struct kernel_param_ops param_ops_ushort;
425 extern int param_set_ushort(const char *val, const struct kernel_param *kp);
426 extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
427 #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
428
429 extern const struct kernel_param_ops param_ops_int;
430 extern int param_set_int(const char *val, const struct kernel_param *kp);
431 extern int param_get_int(char *buffer, const struct kernel_param *kp);
432 #define param_check_int(name, p) __param_check(name, p, int)
433
434 extern const struct kernel_param_ops param_ops_uint;
435 extern int param_set_uint(const char *val, const struct kernel_param *kp);
436 extern int param_get_uint(char *buffer, const struct kernel_param *kp);
437 int param_set_uint_minmax(const char *val, const struct kernel_param *kp,
438 unsigned int min, unsigned int max);
439 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
440
441 extern const struct kernel_param_ops param_ops_long;
442 extern int param_set_long(const char *val, const struct kernel_param *kp);
443 extern int param_get_long(char *buffer, const struct kernel_param *kp);
444 #define param_check_long(name, p) __param_check(name, p, long)
445
446 extern const struct kernel_param_ops param_ops_ulong;
447 extern int param_set_ulong(const char *val, const struct kernel_param *kp);
448 extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
449 #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
450
451 extern const struct kernel_param_ops param_ops_ullong;
452 extern int param_set_ullong(const char *val, const struct kernel_param *kp);
453 extern int param_get_ullong(char *buffer, const struct kernel_param *kp);
454 #define param_check_ullong(name, p) __param_check(name, p, unsigned long long)
455
456 extern const struct kernel_param_ops param_ops_hexint;
457 extern int param_set_hexint(const char *val, const struct kernel_param *kp);
458 extern int param_get_hexint(char *buffer, const struct kernel_param *kp);
459 #define param_check_hexint(name, p) param_check_uint(name, p)
460
461 extern const struct kernel_param_ops param_ops_charp;
462 extern int param_set_charp(const char *val, const struct kernel_param *kp);
463 extern int param_get_charp(char *buffer, const struct kernel_param *kp);
464 extern void param_free_charp(void *arg);
465 #define param_check_charp(name, p) __param_check(name, p, char *)
466
467 /* We used to allow int as well as bool. We're taking that away! */
468 extern const struct kernel_param_ops param_ops_bool;
469 extern int param_set_bool(const char *val, const struct kernel_param *kp);
470 extern int param_get_bool(char *buffer, const struct kernel_param *kp);
471 #define param_check_bool(name, p) __param_check(name, p, bool)
472
473 extern const struct kernel_param_ops param_ops_bool_enable_only;
474 extern int param_set_bool_enable_only(const char *val,
475 const struct kernel_param *kp);
476 /* getter is the same as for the regular bool */
477 #define param_check_bool_enable_only param_check_bool
478
479 extern const struct kernel_param_ops param_ops_invbool;
480 extern int param_set_invbool(const char *val, const struct kernel_param *kp);
481 extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
482 #define param_check_invbool(name, p) __param_check(name, p, bool)
483
484 /* An int, which can only be set like a bool (though it shows as an int). */
485 extern const struct kernel_param_ops param_ops_bint;
486 extern int param_set_bint(const char *val, const struct kernel_param *kp);
487 #define param_get_bint param_get_int
488 #define param_check_bint param_check_int
489
490 /**
491 * module_param_array - a parameter which is an array of some type
492 * @name: the name of the array variable
493 * @type: the type, as per module_param()
494 * @nump: optional pointer filled in with the number written
495 * @perm: visibility in sysfs
496 *
497 * Input and output are as comma-separated values. Commas inside values
498 * don't work properly (eg. an array of charp).
499 *
500 * ARRAY_SIZE(@name) is used to determine the number of elements in the
501 * array, so the definition must be visible.
502 */
503 #define module_param_array(name, type, nump, perm) \
504 module_param_array_named(name, name, type, nump, perm)
505
506 /**
507 * module_param_array_named - renamed parameter which is an array of some type
508 * @name: a valid C identifier which is the parameter name
509 * @array: the name of the array variable
510 * @type: the type, as per module_param()
511 * @nump: optional pointer filled in with the number written
512 * @perm: visibility in sysfs
513 *
514 * This exposes a different name than the actual variable name. See
515 * module_param_named() for why this might be necessary.
516 */
517 #define module_param_array_named(name, array, type, nump, perm) \
518 param_check_##type(name, &(array)[0]); \
519 static const struct kparam_array __param_arr_##name \
520 = { .max = ARRAY_SIZE(array), .num = nump, \
521 .ops = ¶m_ops_##type, \
522 .elemsize = sizeof(array[0]), .elem = array }; \
523 __module_param_call(MODULE_PARAM_PREFIX, name, \
524 ¶m_array_ops, \
525 .arr = &__param_arr_##name, \
526 perm, -1, 0); \
527 __MODULE_PARM_TYPE(name, "array of " #type)
528
529 enum hwparam_type {
530 hwparam_ioport, /* Module parameter configures an I/O port */
531 hwparam_iomem, /* Module parameter configures an I/O mem address */
532 hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
533 hwparam_irq, /* Module parameter configures an IRQ */
534 hwparam_dma, /* Module parameter configures a DMA channel */
535 hwparam_dma_addr, /* Module parameter configures a DMA buffer address */
536 hwparam_other, /* Module parameter configures some other value */
537 };
538
539 /**
540 * module_param_hw_named - A parameter representing a hw parameters
541 * @name: a valid C identifier which is the parameter name.
542 * @value: the actual lvalue to alter.
543 * @type: the type of the parameter
544 * @hwtype: what the value represents (enum hwparam_type)
545 * @perm: visibility in sysfs.
546 *
547 * Usually it's a good idea to have variable names and user-exposed names the
548 * same, but that's harder if the variable must be non-static or is inside a
549 * structure. This allows exposure under a different name.
550 */
551 #define module_param_hw_named(name, value, type, hwtype, perm) \
552 param_check_##type(name, &(value)); \
553 __module_param_call(MODULE_PARAM_PREFIX, name, \
554 ¶m_ops_##type, &value, \
555 perm, -1, \
556 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
557 __MODULE_PARM_TYPE(name, #type)
558
559 #define module_param_hw(name, type, hwtype, perm) \
560 module_param_hw_named(name, name, type, hwtype, perm)
561
562 /**
563 * module_param_hw_array - A parameter representing an array of hw parameters
564 * @name: the name of the array variable
565 * @type: the type, as per module_param()
566 * @hwtype: what the value represents (enum hwparam_type)
567 * @nump: optional pointer filled in with the number written
568 * @perm: visibility in sysfs
569 *
570 * Input and output are as comma-separated values. Commas inside values
571 * don't work properly (eg. an array of charp).
572 *
573 * ARRAY_SIZE(@name) is used to determine the number of elements in the
574 * array, so the definition must be visible.
575 */
576 #define module_param_hw_array(name, type, hwtype, nump, perm) \
577 param_check_##type(name, &(name)[0]); \
578 static const struct kparam_array __param_arr_##name \
579 = { .max = ARRAY_SIZE(name), .num = nump, \
580 .ops = ¶m_ops_##type, \
581 .elemsize = sizeof(name[0]), .elem = name }; \
582 __module_param_call(MODULE_PARAM_PREFIX, name, \
583 ¶m_array_ops, \
584 .arr = &__param_arr_##name, \
585 perm, -1, \
586 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
587 __MODULE_PARM_TYPE(name, "array of " #type)
588
589
590 extern const struct kernel_param_ops param_array_ops;
591
592 extern const struct kernel_param_ops param_ops_string;
593 extern int param_set_copystring(const char *val, const struct kernel_param *);
594 extern int param_get_string(char *buffer, const struct kernel_param *kp);
595
596 /* for exporting parameters in /sys/module/.../parameters */
597
598 struct module;
599
600 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
601 extern int module_param_sysfs_setup(struct module *mod,
602 const struct kernel_param *kparam,
603 unsigned int num_params);
604
605 extern void module_param_sysfs_remove(struct module *mod);
606 #else
module_param_sysfs_setup(struct module * mod,const struct kernel_param * kparam,unsigned int num_params)607 static inline int module_param_sysfs_setup(struct module *mod,
608 const struct kernel_param *kparam,
609 unsigned int num_params)
610 {
611 return 0;
612 }
613
module_param_sysfs_remove(struct module * mod)614 static inline void module_param_sysfs_remove(struct module *mod)
615 { }
616 #endif
617
618 #endif /* _LINUX_MODULE_PARAMS_H */
619