xref: /linux/include/linux/moduleparam.h (revision 06d07429858317ded2db7986113a9e0129cd599b)
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, &param_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, &param_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
286    parameters. */
287 #define __module_param_call(prefix, name, ops, arg, perm, level, flags)	\
288 	/* Default value instead of permissions? */			\
289 	static const char __param_str_##name[] = prefix #name;		\
290 	static struct kernel_param __moduleparam_const __param_##name	\
291 	__used __section("__param")					\
292 	__aligned(__alignof__(struct kernel_param))			\
293 	= { __param_str_##name, THIS_MODULE, ops,			\
294 	    VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
295 
296 /*
297  * Useful for describing a set/get pair used only once (i.e. for this
298  * parameter). For repeated set/get pairs (i.e. the same struct
299  * kernel_param_ops), use module_param_cb() instead.
300  */
301 #define module_param_call(name, _set, _get, arg, perm)			\
302 	static const struct kernel_param_ops __param_ops_##name =	\
303 		{ .flags = 0, .set = _set, .get = _get };		\
304 	__module_param_call(MODULE_PARAM_PREFIX,			\
305 			    name, &__param_ops_##name, arg, perm, -1, 0)
306 
307 #ifdef CONFIG_SYSFS
308 extern void kernel_param_lock(struct module *mod);
309 extern void kernel_param_unlock(struct module *mod);
310 #else
kernel_param_lock(struct module * mod)311 static inline void kernel_param_lock(struct module *mod)
312 {
313 }
kernel_param_unlock(struct module * mod)314 static inline void kernel_param_unlock(struct module *mod)
315 {
316 }
317 #endif
318 
319 #ifndef MODULE
320 /**
321  * core_param - define a historical core kernel parameter.
322  * @name: the name of the cmdline and sysfs parameter (often the same as var)
323  * @var: the variable
324  * @type: the type of the parameter
325  * @perm: visibility in sysfs
326  *
327  * core_param is just like module_param(), but cannot be modular and
328  * doesn't add a prefix (such as "printk.").  This is for compatibility
329  * with __setup(), and it makes sense as truly core parameters aren't
330  * tied to the particular file they're in.
331  */
332 #define core_param(name, var, type, perm)				\
333 	param_check_##type(name, &(var));				\
334 	__module_param_call("", name, &param_ops_##type, &var, perm, -1, 0)
335 
336 /**
337  * core_param_unsafe - same as core_param but taints kernel
338  * @name: the name of the cmdline and sysfs parameter (often the same as var)
339  * @var: the variable
340  * @type: the type of the parameter
341  * @perm: visibility in sysfs
342  */
343 #define core_param_unsafe(name, var, type, perm)		\
344 	param_check_##type(name, &(var));				\
345 	__module_param_call("", name, &param_ops_##type, &var, perm,	\
346 			    -1, KERNEL_PARAM_FL_UNSAFE)
347 
348 #endif /* !MODULE */
349 
350 /**
351  * module_param_string - a char array parameter
352  * @name: the name of the parameter
353  * @string: the string variable
354  * @len: the maximum length of the string, incl. terminator
355  * @perm: visibility in sysfs.
356  *
357  * This actually copies the string when it's set (unlike type charp).
358  * @len is usually just sizeof(string).
359  */
360 #define module_param_string(name, string, len, perm)			\
361 	static const struct kparam_string __param_string_##name		\
362 		= { len, string };					\
363 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
364 			    &param_ops_string,				\
365 			    .str = &__param_string_##name, perm, -1, 0);\
366 	__MODULE_PARM_TYPE(name, "string")
367 
368 /**
369  * parameq - checks if two parameter names match
370  * @name1: parameter name 1
371  * @name2: parameter name 2
372  *
373  * Returns true if the two parameter names are equal.
374  * Dashes (-) are considered equal to underscores (_).
375  */
376 extern bool parameq(const char *name1, const char *name2);
377 
378 /**
379  * parameqn - checks if two parameter names match
380  * @name1: parameter name 1
381  * @name2: parameter name 2
382  * @n: the length to compare
383  *
384  * Similar to parameq(), except it compares @n characters.
385  */
386 extern bool parameqn(const char *name1, const char *name2, size_t n);
387 
388 typedef int (*parse_unknown_fn)(char *param, char *val, const char *doing, void *arg);
389 
390 /* Called on module insert or kernel boot */
391 extern char *parse_args(const char *name,
392 		      char *args,
393 		      const struct kernel_param *params,
394 		      unsigned num,
395 		      s16 level_min,
396 		      s16 level_max,
397 		      void *arg, parse_unknown_fn unknown);
398 
399 /* Called by module remove. */
400 #ifdef CONFIG_SYSFS
401 extern void destroy_params(const struct kernel_param *params, unsigned num);
402 #else
destroy_params(const struct kernel_param * params,unsigned num)403 static inline void destroy_params(const struct kernel_param *params,
404 				  unsigned num)
405 {
406 }
407 #endif /* !CONFIG_SYSFS */
408 
409 /* All the helper functions */
410 /* The macros to do compile-time type checking stolen from Jakub
411    Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
412 #define __param_check(name, p, type) \
413 	static inline type __always_unused *__check_##name(void) { return(p); }
414 
415 extern const struct kernel_param_ops param_ops_byte;
416 extern int param_set_byte(const char *val, const struct kernel_param *kp);
417 extern int param_get_byte(char *buffer, const struct kernel_param *kp);
418 #define param_check_byte(name, p) __param_check(name, p, unsigned char)
419 
420 extern const struct kernel_param_ops param_ops_short;
421 extern int param_set_short(const char *val, const struct kernel_param *kp);
422 extern int param_get_short(char *buffer, const struct kernel_param *kp);
423 #define param_check_short(name, p) __param_check(name, p, short)
424 
425 extern const struct kernel_param_ops param_ops_ushort;
426 extern int param_set_ushort(const char *val, const struct kernel_param *kp);
427 extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
428 #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
429 
430 extern const struct kernel_param_ops param_ops_int;
431 extern int param_set_int(const char *val, const struct kernel_param *kp);
432 extern int param_get_int(char *buffer, const struct kernel_param *kp);
433 #define param_check_int(name, p) __param_check(name, p, int)
434 
435 extern const struct kernel_param_ops param_ops_uint;
436 extern int param_set_uint(const char *val, const struct kernel_param *kp);
437 extern int param_get_uint(char *buffer, const struct kernel_param *kp);
438 int param_set_uint_minmax(const char *val, const struct kernel_param *kp,
439 		unsigned int min, unsigned int max);
440 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
441 
442 extern const struct kernel_param_ops param_ops_long;
443 extern int param_set_long(const char *val, const struct kernel_param *kp);
444 extern int param_get_long(char *buffer, const struct kernel_param *kp);
445 #define param_check_long(name, p) __param_check(name, p, long)
446 
447 extern const struct kernel_param_ops param_ops_ulong;
448 extern int param_set_ulong(const char *val, const struct kernel_param *kp);
449 extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
450 #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
451 
452 extern const struct kernel_param_ops param_ops_ullong;
453 extern int param_set_ullong(const char *val, const struct kernel_param *kp);
454 extern int param_get_ullong(char *buffer, const struct kernel_param *kp);
455 #define param_check_ullong(name, p) __param_check(name, p, unsigned long long)
456 
457 extern const struct kernel_param_ops param_ops_hexint;
458 extern int param_set_hexint(const char *val, const struct kernel_param *kp);
459 extern int param_get_hexint(char *buffer, const struct kernel_param *kp);
460 #define param_check_hexint(name, p) param_check_uint(name, p)
461 
462 extern const struct kernel_param_ops param_ops_charp;
463 extern int param_set_charp(const char *val, const struct kernel_param *kp);
464 extern int param_get_charp(char *buffer, const struct kernel_param *kp);
465 extern void param_free_charp(void *arg);
466 #define param_check_charp(name, p) __param_check(name, p, char *)
467 
468 /* We used to allow int as well as bool.  We're taking that away! */
469 extern const struct kernel_param_ops param_ops_bool;
470 extern int param_set_bool(const char *val, const struct kernel_param *kp);
471 extern int param_get_bool(char *buffer, const struct kernel_param *kp);
472 #define param_check_bool(name, p) __param_check(name, p, bool)
473 
474 extern const struct kernel_param_ops param_ops_bool_enable_only;
475 extern int param_set_bool_enable_only(const char *val,
476 				      const struct kernel_param *kp);
477 /* getter is the same as for the regular bool */
478 #define param_check_bool_enable_only param_check_bool
479 
480 extern const struct kernel_param_ops param_ops_invbool;
481 extern int param_set_invbool(const char *val, const struct kernel_param *kp);
482 extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
483 #define param_check_invbool(name, p) __param_check(name, p, bool)
484 
485 /* An int, which can only be set like a bool (though it shows as an int). */
486 extern const struct kernel_param_ops param_ops_bint;
487 extern int param_set_bint(const char *val, const struct kernel_param *kp);
488 #define param_get_bint param_get_int
489 #define param_check_bint param_check_int
490 
491 /**
492  * module_param_array - a parameter which is an array of some type
493  * @name: the name of the array variable
494  * @type: the type, as per module_param()
495  * @nump: optional pointer filled in with the number written
496  * @perm: visibility in sysfs
497  *
498  * Input and output are as comma-separated values.  Commas inside values
499  * don't work properly (eg. an array of charp).
500  *
501  * ARRAY_SIZE(@name) is used to determine the number of elements in the
502  * array, so the definition must be visible.
503  */
504 #define module_param_array(name, type, nump, perm)		\
505 	module_param_array_named(name, name, type, nump, perm)
506 
507 /**
508  * module_param_array_named - renamed parameter which is an array of some type
509  * @name: a valid C identifier which is the parameter name
510  * @array: 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  * This exposes a different name than the actual variable name.  See
516  * module_param_named() for why this might be necessary.
517  */
518 #define module_param_array_named(name, array, type, nump, perm)		\
519 	param_check_##type(name, &(array)[0]);				\
520 	static const struct kparam_array __param_arr_##name		\
521 	= { .max = ARRAY_SIZE(array), .num = nump,                      \
522 	    .ops = &param_ops_##type,					\
523 	    .elemsize = sizeof(array[0]), .elem = array };		\
524 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
525 			    &param_array_ops,				\
526 			    .arr = &__param_arr_##name,			\
527 			    perm, -1, 0);				\
528 	__MODULE_PARM_TYPE(name, "array of " #type)
529 
530 enum hwparam_type {
531 	hwparam_ioport,		/* Module parameter configures an I/O port */
532 	hwparam_iomem,		/* Module parameter configures an I/O mem address */
533 	hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
534 	hwparam_irq,		/* Module parameter configures an IRQ */
535 	hwparam_dma,		/* Module parameter configures a DMA channel */
536 	hwparam_dma_addr,	/* Module parameter configures a DMA buffer address */
537 	hwparam_other,		/* Module parameter configures some other value */
538 };
539 
540 /**
541  * module_param_hw_named - A parameter representing a hw parameters
542  * @name: a valid C identifier which is the parameter name.
543  * @value: the actual lvalue to alter.
544  * @type: the type of the parameter
545  * @hwtype: what the value represents (enum hwparam_type)
546  * @perm: visibility in sysfs.
547  *
548  * Usually it's a good idea to have variable names and user-exposed names the
549  * same, but that's harder if the variable must be non-static or is inside a
550  * structure.  This allows exposure under a different name.
551  */
552 #define module_param_hw_named(name, value, type, hwtype, perm)		\
553 	param_check_##type(name, &(value));				\
554 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
555 			    &param_ops_##type, &value,			\
556 			    perm, -1,					\
557 			    KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0));	\
558 	__MODULE_PARM_TYPE(name, #type)
559 
560 #define module_param_hw(name, type, hwtype, perm)		\
561 	module_param_hw_named(name, name, type, hwtype, perm)
562 
563 /**
564  * module_param_hw_array - A parameter representing an array of hw parameters
565  * @name: the name of the array variable
566  * @type: the type, as per module_param()
567  * @hwtype: what the value represents (enum hwparam_type)
568  * @nump: optional pointer filled in with the number written
569  * @perm: visibility in sysfs
570  *
571  * Input and output are as comma-separated values.  Commas inside values
572  * don't work properly (eg. an array of charp).
573  *
574  * ARRAY_SIZE(@name) is used to determine the number of elements in the
575  * array, so the definition must be visible.
576  */
577 #define module_param_hw_array(name, type, hwtype, nump, perm)		\
578 	param_check_##type(name, &(name)[0]);				\
579 	static const struct kparam_array __param_arr_##name		\
580 	= { .max = ARRAY_SIZE(name), .num = nump,			\
581 	    .ops = &param_ops_##type,					\
582 	    .elemsize = sizeof(name[0]), .elem = name };		\
583 	__module_param_call(MODULE_PARAM_PREFIX, name,			\
584 			    &param_array_ops,				\
585 			    .arr = &__param_arr_##name,			\
586 			    perm, -1,					\
587 			    KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0));	\
588 	__MODULE_PARM_TYPE(name, "array of " #type)
589 
590 
591 extern const struct kernel_param_ops param_array_ops;
592 
593 extern const struct kernel_param_ops param_ops_string;
594 extern int param_set_copystring(const char *val, const struct kernel_param *);
595 extern int param_get_string(char *buffer, const struct kernel_param *kp);
596 
597 /* for exporting parameters in /sys/module/.../parameters */
598 
599 struct module;
600 
601 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
602 extern int module_param_sysfs_setup(struct module *mod,
603 				    const struct kernel_param *kparam,
604 				    unsigned int num_params);
605 
606 extern void module_param_sysfs_remove(struct module *mod);
607 #else
module_param_sysfs_setup(struct module * mod,const struct kernel_param * kparam,unsigned int num_params)608 static inline int module_param_sysfs_setup(struct module *mod,
609 			     const struct kernel_param *kparam,
610 			     unsigned int num_params)
611 {
612 	return 0;
613 }
614 
module_param_sysfs_remove(struct module * mod)615 static inline void module_param_sysfs_remove(struct module *mod)
616 { }
617 #endif
618 
619 #endif /* _LINUX_MODULE_PARAMS_H */
620