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_assert( \
30 sizeof(info) - 1 == __builtin_strlen(info), \
31 "MODULE_INFO(" #tag ", ...) contains embedded NUL byte"); \
32 static const char __UNIQUE_ID(modinfo)[] \
33 __used __section(".modinfo") __aligned(1) \
34 = __MODULE_INFO_PREFIX __stringify(tag) "=" info
35
36 #define __MODULE_PARM_TYPE(name, _type) \
37 MODULE_INFO(parmtype, #name ":" _type)
38
39 /* One for each parameter, describing how to use it. Some files do
40 multiple of these per line, so can't just use MODULE_INFO. */
41 #define MODULE_PARM_DESC(_parm, desc) \
42 MODULE_INFO(parm, #_parm ":" desc)
43
44 struct kernel_param;
45
46 /*
47 * Flags available for kernel_param_ops
48 *
49 * NOARG - the parameter allows for no argument (foo instead of foo=1)
50 */
51 enum {
52 KERNEL_PARAM_OPS_FL_NOARG = (1 << 0)
53 };
54
55 struct kernel_param_ops {
56 /* How the ops should behave */
57 unsigned int flags;
58 /* Returns 0, or -errno. arg is in kp->arg. */
59 int (*set)(const char *val, const struct kernel_param *kp);
60 /* Returns length written or -errno. Buffer is 4k (ie. be short!) */
61 int (*get)(char *buffer, const struct kernel_param *kp);
62 /* Optional function to free kp->arg when module unloaded. */
63 void (*free)(void *arg);
64 };
65
66 /*
67 * Flags available for kernel_param
68 *
69 * UNSAFE - the parameter is dangerous and setting it will taint the kernel
70 * HWPARAM - Hardware param not permitted in lockdown mode
71 */
72 enum {
73 KERNEL_PARAM_FL_UNSAFE = (1 << 0),
74 KERNEL_PARAM_FL_HWPARAM = (1 << 1),
75 };
76
77 struct kernel_param {
78 const char *name;
79 struct module *mod;
80 const struct kernel_param_ops *ops;
81 const u16 perm;
82 s8 level;
83 u8 flags;
84 union {
85 void *arg;
86 const struct kparam_string *str;
87 const struct kparam_array *arr;
88 };
89 };
90
91 extern const struct kernel_param __start___param[], __stop___param[];
92
93 /* Special one for strings we want to copy into */
94 struct kparam_string {
95 unsigned int maxlen;
96 char *string;
97 };
98
99 /* Special one for arrays */
100 struct kparam_array
101 {
102 unsigned int max;
103 unsigned int elemsize;
104 unsigned int *num;
105 const struct kernel_param_ops *ops;
106 void *elem;
107 };
108
109 /**
110 * module_param - typesafe helper for a module/cmdline parameter
111 * @name: the variable to alter, and exposed parameter name.
112 * @type: the type of the parameter
113 * @perm: visibility in sysfs.
114 *
115 * @name becomes the module parameter, or (prefixed by KBUILD_MODNAME and a
116 * ".") the kernel commandline parameter. Note that - is changed to _, so
117 * the user can use "foo-bar=1" even for variable "foo_bar".
118 *
119 * @perm is 0 if the variable is not to appear in sysfs, or 0444
120 * for world-readable, 0644 for root-writable, etc. Note that if it
121 * is writable, you may need to use kernel_param_lock() around
122 * accesses (esp. charp, which can be kfreed when it changes).
123 *
124 * The @type is simply pasted to refer to a param_ops_##type and a
125 * param_check_##type: for convenience many standard types are provided but
126 * you can create your own by defining those variables.
127 *
128 * Standard types are:
129 * byte, hexint, short, ushort, int, uint, long, ulong
130 * charp: a character pointer
131 * bool: a bool, values 0/1, y/n, Y/N.
132 * invbool: the above, only sense-reversed (N = true).
133 */
134 #define module_param(name, type, perm) \
135 module_param_named(name, name, type, perm)
136
137 /**
138 * module_param_unsafe - same as module_param but taints kernel
139 * @name: the variable to alter, and exposed parameter name.
140 * @type: the type of the parameter
141 * @perm: visibility in sysfs.
142 */
143 #define module_param_unsafe(name, type, perm) \
144 module_param_named_unsafe(name, name, type, perm)
145
146 /**
147 * module_param_named - typesafe helper for a renamed module/cmdline parameter
148 * @name: a valid C identifier which is the parameter name.
149 * @value: the actual lvalue to alter.
150 * @type: the type of the parameter
151 * @perm: visibility in sysfs.
152 *
153 * Usually it's a good idea to have variable names and user-exposed names the
154 * same, but that's harder if the variable must be non-static or is inside a
155 * structure. This allows exposure under a different name.
156 */
157 #define module_param_named(name, value, type, perm) \
158 param_check_##type(name, &(value)); \
159 module_param_cb(name, ¶m_ops_##type, &value, perm); \
160 __MODULE_PARM_TYPE(name, #type)
161
162 /**
163 * module_param_named_unsafe - same as module_param_named but taints kernel
164 * @name: a valid C identifier which is the parameter name.
165 * @value: the actual lvalue to alter.
166 * @type: the type of the parameter
167 * @perm: visibility in sysfs.
168 */
169 #define module_param_named_unsafe(name, value, type, perm) \
170 param_check_##type(name, &(value)); \
171 module_param_cb_unsafe(name, ¶m_ops_##type, &value, perm); \
172 __MODULE_PARM_TYPE(name, #type)
173
174 /**
175 * module_param_cb - general callback for a module/cmdline parameter
176 * @name: a valid C identifier which is the parameter name.
177 * @ops: the set & get operations for this parameter.
178 * @arg: args for @ops
179 * @perm: visibility in sysfs.
180 *
181 * The ops can have NULL set or get functions.
182 */
183 #define module_param_cb(name, ops, arg, perm) \
184 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)
185
186 #define module_param_cb_unsafe(name, ops, arg, perm) \
187 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \
188 KERNEL_PARAM_FL_UNSAFE)
189
190 #define __level_param_cb(name, ops, arg, perm, level) \
191 __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0)
192 /**
193 * core_param_cb - general callback for a module/cmdline parameter
194 * to be evaluated before core initcall level
195 * @name: a valid C identifier which is the parameter name.
196 * @ops: the set & get operations for this parameter.
197 * @arg: args for @ops
198 * @perm: visibility in sysfs.
199 *
200 * The ops can have NULL set or get functions.
201 */
202 #define core_param_cb(name, ops, arg, perm) \
203 __level_param_cb(name, ops, arg, perm, 1)
204
205 /**
206 * postcore_param_cb - general callback for a module/cmdline parameter
207 * to be evaluated before postcore initcall level
208 * @name: a valid C identifier which is the parameter name.
209 * @ops: the set & get operations for this parameter.
210 * @arg: args for @ops
211 * @perm: visibility in sysfs.
212 *
213 * The ops can have NULL set or get functions.
214 */
215 #define postcore_param_cb(name, ops, arg, perm) \
216 __level_param_cb(name, ops, arg, perm, 2)
217
218 /**
219 * arch_param_cb - general callback for a module/cmdline parameter
220 * to be evaluated before arch initcall level
221 * @name: a valid C identifier which is the parameter name.
222 * @ops: the set & get operations for this parameter.
223 * @arg: args for @ops
224 * @perm: visibility in sysfs.
225 *
226 * The ops can have NULL set or get functions.
227 */
228 #define arch_param_cb(name, ops, arg, perm) \
229 __level_param_cb(name, ops, arg, perm, 3)
230
231 /**
232 * subsys_param_cb - general callback for a module/cmdline parameter
233 * to be evaluated before subsys initcall level
234 * @name: a valid C identifier which is the parameter name.
235 * @ops: the set & get operations for this parameter.
236 * @arg: args for @ops
237 * @perm: visibility in sysfs.
238 *
239 * The ops can have NULL set or get functions.
240 */
241 #define subsys_param_cb(name, ops, arg, perm) \
242 __level_param_cb(name, ops, arg, perm, 4)
243
244 /**
245 * fs_param_cb - general callback for a module/cmdline parameter
246 * to be evaluated before fs initcall level
247 * @name: a valid C identifier which is the parameter name.
248 * @ops: the set & get operations for this parameter.
249 * @arg: args for @ops
250 * @perm: visibility in sysfs.
251 *
252 * The ops can have NULL set or get functions.
253 */
254 #define fs_param_cb(name, ops, arg, perm) \
255 __level_param_cb(name, ops, arg, perm, 5)
256
257 /**
258 * device_param_cb - general callback for a module/cmdline parameter
259 * to be evaluated before device initcall level
260 * @name: a valid C identifier which is the parameter name.
261 * @ops: the set & get operations for this parameter.
262 * @arg: args for @ops
263 * @perm: visibility in sysfs.
264 *
265 * The ops can have NULL set or get functions.
266 */
267 #define device_param_cb(name, ops, arg, perm) \
268 __level_param_cb(name, ops, arg, perm, 6)
269
270 /**
271 * late_param_cb - general callback for a module/cmdline parameter
272 * to be evaluated before late initcall level
273 * @name: a valid C identifier which is the parameter name.
274 * @ops: the set & get operations for this parameter.
275 * @arg: args for @ops
276 * @perm: visibility in sysfs.
277 *
278 * The ops can have NULL set or get functions.
279 */
280 #define late_param_cb(name, ops, arg, perm) \
281 __level_param_cb(name, ops, arg, perm, 7)
282
283 /* On alpha, ia64 and ppc64 relocations to global data cannot go into
284 read-only sections (which is part of respective UNIX ABI on these
285 platforms). So 'const' makes no sense and even causes compile failures
286 with some compilers. */
287 #if defined(CONFIG_ALPHA) || defined(CONFIG_PPC64)
288 #define __moduleparam_const
289 #else
290 #define __moduleparam_const const
291 #endif
292
293 /* This is the fundamental function for registering boot/module parameters. */
294 #define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
295 static_assert(sizeof(""prefix) - 1 <= __MODULE_NAME_LEN); \
296 static const char __param_str_##name[] = prefix #name; \
297 static struct kernel_param __moduleparam_const __param_##name \
298 __used __section("__param") \
299 __aligned(__alignof__(struct kernel_param)) \
300 = { __param_str_##name, THIS_MODULE, ops, \
301 VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
302
303 /*
304 * Useful for describing a set/get pair used only once (i.e. for this
305 * parameter). For repeated set/get pairs (i.e. the same struct
306 * kernel_param_ops), use module_param_cb() instead.
307 */
308 #define module_param_call(name, _set, _get, arg, perm) \
309 static const struct kernel_param_ops __param_ops_##name = \
310 { .flags = 0, .set = _set, .get = _get }; \
311 __module_param_call(MODULE_PARAM_PREFIX, \
312 name, &__param_ops_##name, arg, perm, -1, 0)
313
314 #ifdef CONFIG_SYSFS
315 extern void kernel_param_lock(struct module *mod);
316 extern void kernel_param_unlock(struct module *mod);
317 #else
kernel_param_lock(struct module * mod)318 static inline void kernel_param_lock(struct module *mod)
319 {
320 }
kernel_param_unlock(struct module * mod)321 static inline void kernel_param_unlock(struct module *mod)
322 {
323 }
324 #endif
325
326 #ifndef MODULE
327 /**
328 * core_param - define a historical core kernel parameter.
329 * @name: the name of the cmdline and sysfs parameter (often the same as var)
330 * @var: the variable
331 * @type: the type of the parameter
332 * @perm: visibility in sysfs
333 *
334 * core_param is just like module_param(), but cannot be modular and
335 * doesn't add a prefix (such as "printk."). This is for compatibility
336 * with __setup(), and it makes sense as truly core parameters aren't
337 * tied to the particular file they're in.
338 */
339 #define core_param(name, var, type, perm) \
340 param_check_##type(name, &(var)); \
341 __module_param_call("", name, ¶m_ops_##type, &var, perm, -1, 0)
342
343 /**
344 * core_param_unsafe - same as core_param but taints kernel
345 * @name: the name of the cmdline and sysfs parameter (often the same as var)
346 * @var: the variable
347 * @type: the type of the parameter
348 * @perm: visibility in sysfs
349 */
350 #define core_param_unsafe(name, var, type, perm) \
351 param_check_##type(name, &(var)); \
352 __module_param_call("", name, ¶m_ops_##type, &var, perm, \
353 -1, KERNEL_PARAM_FL_UNSAFE)
354
355 /**
356 * __core_param_cb - similar like core_param, with a set/get ops instead of type.
357 * @name: the name of the cmdline and sysfs parameter (often the same as var)
358 * @var: the variable
359 * @ops: the set & get operations for this parameter.
360 * @perm: visibility in sysfs
361 *
362 * Ideally this should be called 'core_param_cb', but the name has been
363 * used for module core parameter, so add the '__' prefix
364 */
365 #define __core_param_cb(name, ops, arg, perm) \
366 __module_param_call("", name, ops, arg, perm, -1, 0)
367
368 #endif /* !MODULE */
369
370 /**
371 * module_param_string - a char array parameter
372 * @name: the name of the parameter
373 * @string: the string variable
374 * @len: the maximum length of the string, incl. terminator
375 * @perm: visibility in sysfs.
376 *
377 * This actually copies the string when it's set (unlike type charp).
378 * @len is usually just sizeof(string).
379 */
380 #define module_param_string(name, string, len, perm) \
381 static const struct kparam_string __param_string_##name \
382 = { len, string }; \
383 __module_param_call(MODULE_PARAM_PREFIX, name, \
384 ¶m_ops_string, \
385 .str = &__param_string_##name, perm, -1, 0);\
386 __MODULE_PARM_TYPE(name, "string")
387
388 /**
389 * parameq - checks if two parameter names match
390 * @name1: parameter name 1
391 * @name2: parameter name 2
392 *
393 * Returns true if the two parameter names are equal.
394 * Dashes (-) are considered equal to underscores (_).
395 */
396 extern bool parameq(const char *name1, const char *name2);
397
398 /**
399 * parameqn - checks if two parameter names match
400 * @name1: parameter name 1
401 * @name2: parameter name 2
402 * @n: the length to compare
403 *
404 * Similar to parameq(), except it compares @n characters.
405 */
406 extern bool parameqn(const char *name1, const char *name2, size_t n);
407
408 typedef int (*parse_unknown_fn)(char *param, char *val, const char *doing, void *arg);
409
410 /* Called on module insert or kernel boot */
411 extern char *parse_args(const char *name,
412 char *args,
413 const struct kernel_param *params,
414 unsigned num,
415 s16 level_min,
416 s16 level_max,
417 void *arg, parse_unknown_fn unknown);
418
419 /* Called by module remove. */
420 #ifdef CONFIG_SYSFS
421 extern void destroy_params(const struct kernel_param *params, unsigned num);
422 #else
destroy_params(const struct kernel_param * params,unsigned num)423 static inline void destroy_params(const struct kernel_param *params,
424 unsigned num)
425 {
426 }
427 #endif /* !CONFIG_SYSFS */
428
429 /* All the helper functions */
430 /* The macros to do compile-time type checking stolen from Jakub
431 Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
432 #define __param_check(name, p, type) \
433 static inline type __always_unused *__check_##name(void) { return(p); }
434
435 extern const struct kernel_param_ops param_ops_byte;
436 extern int param_set_byte(const char *val, const struct kernel_param *kp);
437 extern int param_get_byte(char *buffer, const struct kernel_param *kp);
438 #define param_check_byte(name, p) __param_check(name, p, unsigned char)
439
440 extern const struct kernel_param_ops param_ops_short;
441 extern int param_set_short(const char *val, const struct kernel_param *kp);
442 extern int param_get_short(char *buffer, const struct kernel_param *kp);
443 #define param_check_short(name, p) __param_check(name, p, short)
444
445 extern const struct kernel_param_ops param_ops_ushort;
446 extern int param_set_ushort(const char *val, const struct kernel_param *kp);
447 extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
448 #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
449
450 extern const struct kernel_param_ops param_ops_int;
451 extern int param_set_int(const char *val, const struct kernel_param *kp);
452 extern int param_get_int(char *buffer, const struct kernel_param *kp);
453 #define param_check_int(name, p) __param_check(name, p, int)
454
455 extern const struct kernel_param_ops param_ops_uint;
456 extern int param_set_uint(const char *val, const struct kernel_param *kp);
457 extern int param_get_uint(char *buffer, const struct kernel_param *kp);
458 int param_set_uint_minmax(const char *val, const struct kernel_param *kp,
459 unsigned int min, unsigned int max);
460 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
461
462 extern const struct kernel_param_ops param_ops_long;
463 extern int param_set_long(const char *val, const struct kernel_param *kp);
464 extern int param_get_long(char *buffer, const struct kernel_param *kp);
465 #define param_check_long(name, p) __param_check(name, p, long)
466
467 extern const struct kernel_param_ops param_ops_ulong;
468 extern int param_set_ulong(const char *val, const struct kernel_param *kp);
469 extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
470 #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
471
472 extern const struct kernel_param_ops param_ops_ullong;
473 extern int param_set_ullong(const char *val, const struct kernel_param *kp);
474 extern int param_get_ullong(char *buffer, const struct kernel_param *kp);
475 #define param_check_ullong(name, p) __param_check(name, p, unsigned long long)
476
477 extern const struct kernel_param_ops param_ops_hexint;
478 extern int param_set_hexint(const char *val, const struct kernel_param *kp);
479 extern int param_get_hexint(char *buffer, const struct kernel_param *kp);
480 #define param_check_hexint(name, p) param_check_uint(name, p)
481
482 extern const struct kernel_param_ops param_ops_charp;
483 extern int param_set_charp(const char *val, const struct kernel_param *kp);
484 extern int param_get_charp(char *buffer, const struct kernel_param *kp);
485 extern void param_free_charp(void *arg);
486 #define param_check_charp(name, p) __param_check(name, p, char *)
487
488 /* We used to allow int as well as bool. We're taking that away! */
489 extern const struct kernel_param_ops param_ops_bool;
490 extern int param_set_bool(const char *val, const struct kernel_param *kp);
491 extern int param_get_bool(char *buffer, const struct kernel_param *kp);
492 #define param_check_bool(name, p) __param_check(name, p, bool)
493
494 extern const struct kernel_param_ops param_ops_bool_enable_only;
495 extern int param_set_bool_enable_only(const char *val,
496 const struct kernel_param *kp);
497 /* getter is the same as for the regular bool */
498 #define param_check_bool_enable_only param_check_bool
499
500 extern const struct kernel_param_ops param_ops_invbool;
501 extern int param_set_invbool(const char *val, const struct kernel_param *kp);
502 extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
503 #define param_check_invbool(name, p) __param_check(name, p, bool)
504
505 /* An int, which can only be set like a bool (though it shows as an int). */
506 extern const struct kernel_param_ops param_ops_bint;
507 extern int param_set_bint(const char *val, const struct kernel_param *kp);
508 #define param_get_bint param_get_int
509 #define param_check_bint param_check_int
510
511 /**
512 * module_param_array - a parameter which is an array of some type
513 * @name: the name of the array variable
514 * @type: the type, as per module_param()
515 * @nump: optional pointer filled in with the number written
516 * @perm: visibility in sysfs
517 *
518 * Input and output are as comma-separated values. Commas inside values
519 * don't work properly (eg. an array of charp).
520 *
521 * ARRAY_SIZE(@name) is used to determine the number of elements in the
522 * array, so the definition must be visible.
523 */
524 #define module_param_array(name, type, nump, perm) \
525 module_param_array_named(name, name, type, nump, perm)
526
527 /**
528 * module_param_array_named - renamed parameter which is an array of some type
529 * @name: a valid C identifier which is the parameter name
530 * @array: the name of the array variable
531 * @type: the type, as per module_param()
532 * @nump: optional pointer filled in with the number written
533 * @perm: visibility in sysfs
534 *
535 * This exposes a different name than the actual variable name. See
536 * module_param_named() for why this might be necessary.
537 */
538 #define module_param_array_named(name, array, type, nump, perm) \
539 param_check_##type(name, &(array)[0]); \
540 static const struct kparam_array __param_arr_##name \
541 = { .max = ARRAY_SIZE(array), .num = nump, \
542 .ops = ¶m_ops_##type, \
543 .elemsize = sizeof(array[0]), .elem = array }; \
544 __module_param_call(MODULE_PARAM_PREFIX, name, \
545 ¶m_array_ops, \
546 .arr = &__param_arr_##name, \
547 perm, -1, 0); \
548 __MODULE_PARM_TYPE(name, "array of " #type)
549
550 enum hwparam_type {
551 hwparam_ioport, /* Module parameter configures an I/O port */
552 hwparam_iomem, /* Module parameter configures an I/O mem address */
553 hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
554 hwparam_irq, /* Module parameter configures an IRQ */
555 hwparam_dma, /* Module parameter configures a DMA channel */
556 hwparam_dma_addr, /* Module parameter configures a DMA buffer address */
557 hwparam_other, /* Module parameter configures some other value */
558 };
559
560 /**
561 * module_param_hw_named - A parameter representing a hw parameters
562 * @name: a valid C identifier which is the parameter name.
563 * @value: the actual lvalue to alter.
564 * @type: the type of the parameter
565 * @hwtype: what the value represents (enum hwparam_type)
566 * @perm: visibility in sysfs.
567 *
568 * Usually it's a good idea to have variable names and user-exposed names the
569 * same, but that's harder if the variable must be non-static or is inside a
570 * structure. This allows exposure under a different name.
571 */
572 #define module_param_hw_named(name, value, type, hwtype, perm) \
573 param_check_##type(name, &(value)); \
574 __module_param_call(MODULE_PARAM_PREFIX, name, \
575 ¶m_ops_##type, &value, \
576 perm, -1, \
577 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
578 __MODULE_PARM_TYPE(name, #type)
579
580 #define module_param_hw(name, type, hwtype, perm) \
581 module_param_hw_named(name, name, type, hwtype, perm)
582
583 /**
584 * module_param_hw_array - A parameter representing an array of hw parameters
585 * @name: the name of the array variable
586 * @type: the type, as per module_param()
587 * @hwtype: what the value represents (enum hwparam_type)
588 * @nump: optional pointer filled in with the number written
589 * @perm: visibility in sysfs
590 *
591 * Input and output are as comma-separated values. Commas inside values
592 * don't work properly (eg. an array of charp).
593 *
594 * ARRAY_SIZE(@name) is used to determine the number of elements in the
595 * array, so the definition must be visible.
596 */
597 #define module_param_hw_array(name, type, hwtype, nump, perm) \
598 param_check_##type(name, &(name)[0]); \
599 static const struct kparam_array __param_arr_##name \
600 = { .max = ARRAY_SIZE(name), .num = nump, \
601 .ops = ¶m_ops_##type, \
602 .elemsize = sizeof(name[0]), .elem = name }; \
603 __module_param_call(MODULE_PARAM_PREFIX, name, \
604 ¶m_array_ops, \
605 .arr = &__param_arr_##name, \
606 perm, -1, \
607 KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
608 __MODULE_PARM_TYPE(name, "array of " #type)
609
610
611 extern const struct kernel_param_ops param_array_ops;
612
613 extern const struct kernel_param_ops param_ops_string;
614 extern int param_set_copystring(const char *val, const struct kernel_param *);
615 extern int param_get_string(char *buffer, const struct kernel_param *kp);
616
617 /* for exporting parameters in /sys/module/.../parameters */
618
619 struct module;
620
621 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
622 extern int module_param_sysfs_setup(struct module *mod,
623 const struct kernel_param *kparam,
624 unsigned int num_params);
625
626 extern void module_param_sysfs_remove(struct module *mod);
627 #else
module_param_sysfs_setup(struct module * mod,const struct kernel_param * kparam,unsigned int num_params)628 static inline int module_param_sysfs_setup(struct module *mod,
629 const struct kernel_param *kparam,
630 unsigned int num_params)
631 {
632 return 0;
633 }
634
module_param_sysfs_remove(struct module * mod)635 static inline void module_param_sysfs_remove(struct module *mod)
636 { }
637 #endif
638
639 #endif /* _LINUX_MODULE_PARAMS_H */
640