summaryrefslogtreecommitdiff
path: root/include/linux/moduleparam.h
blob: 47879fc7f75e1f2284e3ef760f3577b1af59378e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MODULE_PARAMS_H
#define _LINUX_MODULE_PARAMS_H
/* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */
#include <linux/init.h>
#include <linux/stringify.h>
#include <linux/kernel.h>

/* You can override this manually, but generally this should match the
   module name. */
#ifdef MODULE
#define MODULE_PARAM_PREFIX /* empty */
#define __MODULE_INFO_PREFIX /* empty */
#else
#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
/* We cannot use MODULE_PARAM_PREFIX because some modules override it. */
#define __MODULE_INFO_PREFIX KBUILD_MODNAME "."
#endif

/* Chosen so that structs with an unsigned long line up. */
#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))

#define __MODULE_INFO(tag, name, info)					  \
static const char __UNIQUE_ID(name)[]					  \
  __used __attribute__((section(".modinfo"), unused, aligned(1)))	  \
  = __MODULE_INFO_PREFIX __stringify(tag) "=" info

#define __MODULE_PARM_TYPE(name, _type)					  \
  __MODULE_INFO(parmtype, name##type, #name ":" _type)

/* One for each parameter, describing how to use it.  Some files do
   multiple of these per line, so can't just use MODULE_INFO. */
#define MODULE_PARM_DESC(_parm, desc) \
	__MODULE_INFO(parm, _parm, #_parm ":" desc)

struct kernel_param;

/*
 * Flags available for kernel_param_ops
 *
 * NOARG - the parameter allows for no argument (foo instead of foo=1)
 */
enum {
	KERNEL_PARAM_OPS_FL_NOARG = (1 << 0)
};

struct kernel_param_ops {
	/* How the ops should behave */
	unsigned int flags;
	/* Returns 0, or -errno.  arg is in kp->arg. */
	int (*set)(const char *val, const struct kernel_param *kp);
	/* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
	int (*get)(char *buffer, const struct kernel_param *kp);
	/* Optional function to free kp->arg when module unloaded. */
	void (*free)(void *arg);
};

/*
 * Flags available for kernel_param
 *
 * UNSAFE - the parameter is dangerous and setting it will taint the kernel
 * HWPARAM - Hardware param not permitted in lockdown mode
 */
enum {
	KERNEL_PARAM_FL_UNSAFE	= (1 << 0),
	KERNEL_PARAM_FL_HWPARAM	= (1 << 1),
};

struct kernel_param {
	const char *name;
	struct module *mod;
	const struct kernel_param_ops *ops;
	const u16 perm;
	s8 level;
	u8 flags;
	union {
		void *arg;
		const struct kparam_string *str;
		const struct kparam_array *arr;
	};
};

extern const struct kernel_param __start___param[], __stop___param[];

/* Special one for strings we want to copy into */
struct kparam_string {
	unsigned int maxlen;
	char *string;
};

/* Special one for arrays */
struct kparam_array
{
	unsigned int max;
	unsigned int elemsize;
	unsigned int *num;
	const struct kernel_param_ops *ops;
	void *elem;
};

/**
 * module_param - typesafe helper for a module/cmdline parameter
 * @name: the variable to alter, and exposed parameter name.
 * @type: the type of the parameter
 * @perm: visibility in sysfs.
 *
 * @name becomes the module parameter, or (prefixed by KBUILD_MODNAME and a
 * ".") the kernel commandline parameter.  Note that - is changed to _, so
 * the user can use "foo-bar=1" even for variable "foo_bar".
 *
 * @perm is 0 if the variable is not to appear in sysfs, or 0444
 * for world-readable, 0644 for root-writable, etc.  Note that if it
 * is writable, you may need to use kernel_param_lock() around
 * accesses (esp. charp, which can be kfreed when it changes).
 *
 * The @type is simply pasted to refer to a param_ops_##type and a
 * param_check_##type: for convenience many standard types are provided but
 * you can create your own by defining those variables.
 *
 * Standard types are:
 *	byte, hexint, short, ushort, int, uint, long, ulong
 *	charp: a character pointer
 *	bool: a bool, values 0/1, y/n, Y/N.
 *	invbool: the above, only sense-reversed (N = true).
 */
#define module_param(name, type, perm)				\
	module_param_named(name, name, type, perm)

/**
 * module_param_unsafe - same as module_param but taints kernel
 * @name: the variable to alter, and exposed parameter name.
 * @type: the type of the parameter
 * @perm: visibility in sysfs.
 */
#define module_param_unsafe(name, type, perm)			\
	module_param_named_unsafe(name, name, type, perm)

/**
 * module_param_named - typesafe helper for a renamed module/cmdline parameter
 * @name: a valid C identifier which is the parameter name.
 * @value: the actual lvalue to alter.
 * @type: the type of the parameter
 * @perm: visibility in sysfs.
 *
 * Usually it's a good idea to have variable names and user-exposed names the
 * same, but that's harder if the variable must be non-static or is inside a
 * structure.  This allows exposure under a different name.
 */
#define module_param_named(name, value, type, perm)			   \
	param_check_##type(name, &(value));				   \
	module_param_cb(name, &param_ops_##type, &value, perm);		   \
	__MODULE_PARM_TYPE(name, #type)

/**
 * module_param_named_unsafe - same as module_param_named but taints kernel
 * @name: a valid C identifier which is the parameter name.
 * @value: the actual lvalue to alter.
 * @type: the type of the parameter
 * @perm: visibility in sysfs.
 */
#define module_param_named_unsafe(name, value, type, perm)		\
	param_check_##type(name, &(value));				\
	module_param_cb_unsafe(name, &param_ops_##type, &value, perm);	\
	__MODULE_PARM_TYPE(name, #type)

/**
 * module_param_cb - general callback for a module/cmdline parameter
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define module_param_cb(name, ops, arg, perm)				      \
	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)

#define module_param_cb_unsafe(name, ops, arg, perm)			      \
	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1,    \
			    KERNEL_PARAM_FL_UNSAFE)

#define __level_param_cb(name, ops, arg, perm, level)			\
	__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0)
/**
 * core_param_cb - general callback for a module/cmdline parameter
 *                 to be evaluated before core initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define core_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 1)

/**
 * postcore_param_cb - general callback for a module/cmdline parameter
 *                     to be evaluated before postcore initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define postcore_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 2)

/**
 * arch_param_cb - general callback for a module/cmdline parameter
 *                 to be evaluated before arch initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define arch_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 3)

/**
 * subsys_param_cb - general callback for a module/cmdline parameter
 *                   to be evaluated before subsys initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define subsys_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 4)

/**
 * fs_param_cb - general callback for a module/cmdline parameter
 *               to be evaluated before fs initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define fs_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 5)

/**
 * device_param_cb - general callback for a module/cmdline parameter
 *                   to be evaluated before device initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define device_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 6)

/**
 * late_param_cb - general callback for a module/cmdline parameter
 *                 to be evaluated before late initcall level
 * @name: a valid C identifier which is the parameter name.
 * @ops: the set & get operations for this parameter.
 * @arg: args for @ops
 * @perm: visibility in sysfs.
 *
 * The ops can have NULL set or get functions.
 */
#define late_param_cb(name, ops, arg, perm)		\
	__level_param_cb(name, ops, arg, perm, 7)

/* On alpha, ia64 and ppc64 relocations to global data cannot go into
   read-only sections (which is part of respective UNIX ABI on these
   platforms). So 'const' makes no sense and even causes compile failures
   with some compilers. */
#if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
#define __moduleparam_const
#else
#define __moduleparam_const const
#endif

/* This is the fundamental function for registering boot/module
   parameters. */
#define __module_param_call(prefix, name, ops, arg, perm, level, flags)	\
	/* Default value instead of permissions? */			\
	static const char __param_str_##name[] = prefix #name;		\
	static struct kernel_param __moduleparam_const __param_##name	\
	__used								\
    __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
	= { __param_str_##name, THIS_MODULE, ops,			\
	    VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }

/* Obsolete - use module_param_cb() */
#define module_param_call(name, _set, _get, arg, perm)			\
	static const struct kernel_param_ops __param_ops_##name =	\
		{ .flags = 0, .set = _set, .get = _get };		\
	__module_param_call(MODULE_PARAM_PREFIX,			\
			    name, &__param_ops_##name, arg, perm, -1, 0)

#ifdef CONFIG_SYSFS
extern void kernel_param_lock(struct module *mod);
extern void kernel_param_unlock(struct module *mod);
#else
static inline void kernel_param_lock(struct module *mod)
{
}
static inline void kernel_param_unlock(struct module *mod)
{
}
#endif

#ifndef MODULE
/**
 * core_param - define a historical core kernel parameter.
 * @name: the name of the cmdline and sysfs parameter (often the same as var)
 * @var: the variable
 * @type: the type of the parameter
 * @perm: visibility in sysfs
 *
 * core_param is just like module_param(), but cannot be modular and
 * doesn't add a prefix (such as "printk.").  This is for compatibility
 * with __setup(), and it makes sense as truly core parameters aren't
 * tied to the particular file they're in.
 */
#define core_param(name, var, type, perm)				\
	param_check_##type(name, &(var));				\
	__module_param_call("", name, &param_ops_##type, &var, perm, -1, 0)

/**
 * core_param_unsafe - same as core_param but taints kernel
 * @name: the name of the cmdline and sysfs parameter (often the same as var)
 * @var: the variable
 * @type: the type of the parameter
 * @perm: visibility in sysfs
 */
#define core_param_unsafe(name, var, type, perm)		\
	param_check_##type(name, &(var));				\
	__module_param_call("", name, &param_ops_##type, &var, perm,	\
			    -1, KERNEL_PARAM_FL_UNSAFE)

#endif /* !MODULE */

/**
 * module_param_string - a char array parameter
 * @name: the name of the parameter
 * @string: the string variable
 * @len: the maximum length of the string, incl. terminator
 * @perm: visibility in sysfs.
 *
 * This actually copies the string when it's set (unlike type charp).
 * @len is usually just sizeof(string).
 */
#define module_param_string(name, string, len, perm)			\
	static const struct kparam_string __param_string_##name		\
		= { len, string };					\
	__module_param_call(MODULE_PARAM_PREFIX, name,			\
			    &param_ops_string,				\
			    .str = &__param_string_##name, perm, -1, 0);\
	__MODULE_PARM_TYPE(name, "string")

/**
 * parameq - checks if two parameter names match
 * @name1: parameter name 1
 * @name2: parameter name 2
 *
 * Returns true if the two parameter names are equal.
 * Dashes (-) are considered equal to underscores (_).
 */
extern bool parameq(const char *name1, const char *name2);

/**
 * parameqn - checks if two parameter names match
 * @name1: parameter name 1
 * @name2: parameter name 2
 * @n: the length to compare
 *
 * Similar to parameq(), except it compares @n characters.
 */
extern bool parameqn(const char *name1, const char *name2, size_t n);

/* Called on module insert or kernel boot */
extern char *parse_args(const char *name,
		      char *args,
		      const struct kernel_param *params,
		      unsigned num,
		      s16 level_min,
		      s16 level_max,
		      void *arg,
		      int (*unknown)(char *param, char *val,
				     const char *doing, void *arg));

/* Called by module remove. */
#ifdef CONFIG_SYSFS
extern void destroy_params(const struct kernel_param *params, unsigned num);
#else
static inline void destroy_params(const struct kernel_param *params,
				  unsigned num)
{
}
#endif /* !CONFIG_SYSFS */

/* All the helper functions */
/* The macros to do compile-time type checking stolen from Jakub
   Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
#define __param_check(name, p, type) \
	static inline type __always_unused *__check_##name(void) { return(p); }

extern const struct kernel_param_ops param_ops_byte;
extern int param_set_byte(const char *val, const struct kernel_param *kp);
extern int param_get_byte(char *buffer, const struct kernel_param *kp);
#define param_check_byte(name, p) __param_check(name, p, unsigned char)

extern const struct kernel_param_ops param_ops_short;
extern int param_set_short(const char *val, const struct kernel_param *kp);
extern int param_get_short(char *buffer, const struct kernel_param *kp);
#define param_check_short(name, p) __param_check(name, p, short)

extern const struct kernel_param_ops param_ops_ushort;
extern int param_set_ushort(const char *val, const struct kernel_param *kp);
extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
#define param_check_ushort(name, p) __param_check(name, p, unsigned short)

extern const struct kernel_param_ops param_ops_int;
extern int param_set_int(const char *val, const struct kernel_param *kp);
extern int param_get_int(char *buffer, const struct kernel_param *kp);
#define param_check_int(name, p) __param_check(name, p, int)

extern const struct kernel_param_ops param_ops_uint;
extern int param_set_uint(const char *val, const struct kernel_param *kp);
extern int param_get_uint(char *buffer, const struct kernel_param *kp);
#define param_check_uint(name, p) __param_check(name, p, unsigned int)

extern const struct kernel_param_ops param_ops_long;
extern int param_set_long(const char *val, const struct kernel_param *kp);
extern int param_get_long(char *buffer, const struct kernel_param *kp);
#define param_check_long(name, p) __param_check(name, p, long)

extern const struct kernel_param_ops param_ops_ulong;
extern int param_set_ulong(const char *val, const struct kernel_param *kp);
extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
#define param_check_ulong(name, p) __param_check(name, p, unsigned long)

extern const struct kernel_param_ops param_ops_ullong;
extern int param_set_ullong(const char *val, const struct kernel_param *kp);
extern int param_get_ullong(char *buffer, const struct kernel_param *kp);
#define param_check_ullong(name, p) __param_check(name, p, unsigned long long)

extern const struct kernel_param_ops param_ops_hexint;
extern int param_set_hexint(const char *val, const struct kernel_param *kp);
extern int param_get_hexint(char *buffer, const struct kernel_param *kp);
#define param_check_hexint(name, p) param_check_uint(name, p)

extern const struct kernel_param_ops param_ops_charp;
extern int param_set_charp(const char *val, const struct kernel_param *kp);
extern int param_get_charp(char *buffer, const struct kernel_param *kp);
extern void param_free_charp(void *arg);
#define param_check_charp(name, p) __param_check(name, p, char *)

/* We used to allow int as well as bool.  We're taking that away! */
extern const struct kernel_param_ops param_ops_bool;
extern int param_set_bool(const char *val, const struct kernel_param *kp);
extern int param_get_bool(char *buffer, const struct kernel_param *kp);
#define param_check_bool(name, p) __param_check(name, p, bool)

extern const struct kernel_param_ops param_ops_bool_enable_only;
extern int param_set_bool_enable_only(const char *val,
				      const struct kernel_param *kp);
/* getter is the same as for the regular bool */
#define param_check_bool_enable_only param_check_bool

extern const struct kernel_param_ops param_ops_invbool;
extern int param_set_invbool(const char *val, const struct kernel_param *kp);
extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
#define param_check_invbool(name, p) __param_check(name, p, bool)

/* An int, which can only be set like a bool (though it shows as an int). */
extern const struct kernel_param_ops param_ops_bint;
extern int param_set_bint(const char *val, const struct kernel_param *kp);
#define param_get_bint param_get_int
#define param_check_bint param_check_int

/**
 * module_param_array - a parameter which is an array of some type
 * @name: the name of the array variable
 * @type: the type, as per module_param()
 * @nump: optional pointer filled in with the number written
 * @perm: visibility in sysfs
 *
 * Input and output are as comma-separated values.  Commas inside values
 * don't work properly (eg. an array of charp).
 *
 * ARRAY_SIZE(@name) is used to determine the number of elements in the
 * array, so the definition must be visible.
 */
#define module_param_array(name, type, nump, perm)		\
	module_param_array_named(name, name, type, nump, perm)

/**
 * module_param_array_named - renamed parameter which is an array of some type
 * @name: a valid C identifier which is the parameter name
 * @array: the name of the array variable
 * @type: the type, as per module_param()
 * @nump: optional pointer filled in with the number written
 * @perm: visibility in sysfs
 *
 * This exposes a different name than the actual variable name.  See
 * module_param_named() for why this might be necessary.
 */
#define module_param_array_named(name, array, type, nump, perm)		\
	param_check_##type(name, &(array)[0]);				\
	static const struct kparam_array __param_arr_##name		\
	= { .max = ARRAY_SIZE(array), .num = nump,                      \
	    .ops = &param_ops_##type,					\
	    .elemsize = sizeof(array[0]), .elem = array };		\
	__module_param_call(MODULE_PARAM_PREFIX, name,			\
			    &param_array_ops,				\
			    .arr = &__param_arr_##name,			\
			    perm, -1, 0);				\
	__MODULE_PARM_TYPE(name, "array of " #type)

enum hwparam_type {
	hwparam_ioport,		/* Module parameter configures an I/O port */
	hwparam_iomem,		/* Module parameter configures an I/O mem address */
	hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
	hwparam_irq,		/* Module parameter configures an IRQ */
	hwparam_dma,		/* Module parameter configures a DMA channel */
	hwparam_dma_addr,	/* Module parameter configures a DMA buffer address */
	hwparam_other,		/* Module parameter configures some other value */
};

/**
 * module_param_hw_named - A parameter representing a hw parameters
 * @name: a valid C identifier which is the parameter name.
 * @value: the actual lvalue to alter.
 * @type: the type of the parameter
 * @hwtype: what the value represents (enum hwparam_type)
 * @perm: visibility in sysfs.
 *
 * Usually it's a good idea to have variable names and user-exposed names the
 * same, but that's harder if the variable must be non-static or is inside a
 * structure.  This allows exposure under a different name.
 */
#define module_param_hw_named(name, value, type, hwtype, perm)		\
	param_check_##type(name, &(value));				\
	__module_param_call(MODULE_PARAM_PREFIX, name,			\
			    &param_ops_##type, &value,			\
			    perm, -1,					\
			    KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0));	\
	__MODULE_PARM_TYPE(name, #type)

#define module_param_hw(name, type, hwtype, perm)		\
	module_param_hw_named(name, name, type, hwtype, perm)

/**
 * module_param_hw_array - A parameter representing an array of hw parameters
 * @name: the name of the array variable
 * @type: the type, as per module_param()
 * @hwtype: what the value represents (enum hwparam_type)
 * @nump: optional pointer filled in with the number written
 * @perm: visibility in sysfs
 *
 * Input and output are as comma-separated values.  Commas inside values
 * don't work properly (eg. an array of charp).
 *
 * ARRAY_SIZE(@name) is used to determine the number of elements in the
 * array, so the definition must be visible.
 */
#define module_param_hw_array(name, type, hwtype, nump, perm)		\
	param_check_##type(name, &(name)[0]);				\
	static const struct kparam_array __param_arr_##name		\
	= { .max = ARRAY_SIZE(name), .num = nump,			\
	    .ops = &param_ops_##type,					\
	    .elemsize = sizeof(name[0]), .elem = name };		\
	__module_param_call(MODULE_PARAM_PREFIX, name,			\
			    &param_array_ops,				\
			    .arr = &__param_arr_##name,			\
			    perm, -1,					\
			    KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0));	\
	__MODULE_PARM_TYPE(name, "array of " #type)


extern const struct kernel_param_ops param_array_ops;

extern const struct kernel_param_ops param_ops_string;
extern int param_set_copystring(const char *val, const struct kernel_param *);
extern int param_get_string(char *buffer, const struct kernel_param *kp);

/* for exporting parameters in /sys/module/.../parameters */

struct module;

#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
extern int module_param_sysfs_setup(struct module *mod,
				    const struct kernel_param *kparam,
				    unsigned int num_params);

extern void module_param_sysfs_remove(struct module *mod);
#else
static inline int module_param_sysfs_setup(struct module *mod,
			     const struct kernel_param *kparam,
			     unsigned int num_params)
{
	return 0;
}

static inline void module_param_sysfs_remove(struct module *mod)
{ }
#endif

#endif /* _LINUX_MODULE_PARAMS_H */